Refactoring (WIP): Convert to Kotlin

app/build.gradle

@@ -1,5 +1,6 @@
 apply plugin: 'com.android.application'
 apply plugin: "androidx.navigation.safeargs"
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 34
@@ -96,8 +97,8 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_9
+        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_1_9
+        targetCompatibility JavaVersion.VERSION_17
     }
     namespace 'net.mynero.wallet'
     buildFeatures {
@@ -112,16 +113,16 @@ static def getId(name) {
 }
 
 dependencies {
-    implementation 'androidx.core:core:1.10.0'
+    implementation 'androidx.core:core-ktx:1.12.0'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'androidx.recyclerview:recyclerview:1.3.0'
+    implementation 'androidx.recyclerview:recyclerview:1.3.2'
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation 'androidx.preference:preference:1.2.0'
+    implementation 'androidx.preference:preference-ktx:1.2.1'
 
-    implementation 'com.google.android.material:material:1.8.0'
+    implementation 'com.google.android.material:material:1.10.0'
     implementation 'com.ncorti:slidetoact:0.9.0'
     implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
     implementation "com.jakewharton.timber:timber:5.0.1"
@@ -129,10 +130,13 @@ dependencies {
     implementation fileTree(dir: 'libs/classes', include: ['*.jar'])
 
     implementation 'org.slf4j:slf4j-nop:1.7.36'
-    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.6.1'
+    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.6.2'
-    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.2'
-    implementation 'androidx.navigation:navigation-fragment:2.5.3'
+    implementation 'androidx.navigation:navigation-fragment:2.7.5'
-    implementation 'androidx.navigation:navigation-ui:2.5.3'
+    implementation 'androidx.navigation:navigation-ui:2.7.5'
+
+    implementation 'androidx.core:core-ktx:1.12.0'
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 
     //noinspection GradleDependency
     testImplementation "junit:junit:4.13.2"

app/src/main/cpp/monerujo.cpp

@@ -1004,33 +1004,6 @@ Java_net_mynero_wallet_model_Wallet_getDeviceTypeJ(JNIEnv *env, jobject instance
     return static_cast<jint>(device_type);
 }
 
-//void cn_slow_hash(const void *data, size_t length, char *hash); // from crypto/hash-ops.h
-JNIEXPORT jbyteArray JNICALL
-Java_net_mynero_wallet_util_KeyStoreHelper_slowHash(JNIEnv *env, jclass clazz,
-                                                       jbyteArray data, jint brokenVariant) {
-    char hash[HASH_SIZE];
-    jsize size = env->GetArrayLength(data);
-    if ((brokenVariant > 0) && (size < 200 /*sizeof(union hash_state)*/)) {
-        return nullptr;
-    }
-
-    jbyte *buffer = env->GetByteArrayElements(data, nullptr);
-    switch (brokenVariant) {
-        case 1:
-            slow_hash_broken(buffer, hash, 1);
-            break;
-        case 2:
-            slow_hash_broken(buffer, hash, 0);
-            break;
-        default: // not broken
-            slow_hash(buffer, (size_t) size, hash);
-    }
-    env->ReleaseByteArrayElements(data, buffer, JNI_ABORT); // do not update java byte[]
-    jbyteArray result = env->NewByteArray(HASH_SIZE);
-    env->SetByteArrayRegion(result, 0, HASH_SIZE, (jbyte *) hash);
-    return result;
-}
-
 JNIEXPORT jstring JNICALL
 Java_net_mynero_wallet_model_Wallet_getDisplayAmount(JNIEnv *env, jclass clazz,
                                                         jlong amount) {

app/src/main/java/net/mynero/wallet/MainActivity.java

@@ -1,143 +0,0 @@
-package net.mynero.wallet;
-
-import android.content.Intent;
-import android.content.SharedPreferences;
-import android.net.Uri;
-import android.os.Bundle;
-import android.os.PersistableBundle;
-import android.widget.Toast;
-
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.fragment.app.FragmentActivity;
-import androidx.fragment.app.FragmentManager;
-import androidx.navigation.fragment.NavHostFragment;
-
-import net.mynero.wallet.data.DefaultNodes;
-import net.mynero.wallet.data.Node;
-import net.mynero.wallet.fragment.dialog.PasswordBottomSheetDialog;
-import net.mynero.wallet.fragment.dialog.SendBottomSheetDialog;
-import net.mynero.wallet.livedata.SingleLiveEvent;
-import net.mynero.wallet.model.Wallet;
-import net.mynero.wallet.model.WalletManager;
-import net.mynero.wallet.service.AddressService;
-import net.mynero.wallet.service.BalanceService;
-import net.mynero.wallet.service.BlockchainService;
-import net.mynero.wallet.service.HistoryService;
-import net.mynero.wallet.service.MoneroHandlerThread;
-import net.mynero.wallet.service.PrefService;
-import net.mynero.wallet.service.TxService;
-import net.mynero.wallet.service.UTXOService;
-import net.mynero.wallet.util.Constants;
-import net.mynero.wallet.util.UriData;
-
-import org.json.JSONArray;
-
-import java.io.File;
-
-public class MainActivity extends AppCompatActivity implements MoneroHandlerThread.Listener, PasswordBottomSheetDialog.PasswordListener {
-    public final SingleLiveEvent restartEvents = new SingleLiveEvent();
-    private MoneroHandlerThread thread = null;
-    private BalanceService balanceService = null;
-    private AddressService addressService = null;
-    private HistoryService historyService = null;
-    private BlockchainService blockchainService = null;
-    private UTXOService utxoService = null;
-
-    private boolean proceedToSend = false;
-    private UriData uriData = null;
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
-        File walletFile = new File(getApplicationInfo().dataDir, Constants.WALLET_NAME);
-        File walletKeysFile = new File(getApplicationInfo().dataDir, Constants.WALLET_NAME + ".keys");
-        if (walletKeysFile.exists()) {
-            boolean promptPassword = PrefService.getInstance().getBoolean(Constants.PREF_USES_PASSWORD, false);
-            if (!promptPassword) {
-                init(walletFile, "");
-            } else {
-                PasswordBottomSheetDialog passwordDialog = new PasswordBottomSheetDialog();
-                passwordDialog.listener = this;
-                passwordDialog.show(getSupportFragmentManager(), "password_dialog");
-            }
-
-            Intent intent = getIntent();
-            Uri uri = intent.getData();
-            if (uri != null) {
-                uriData = UriData.parse(uri.toString());
-                if (uriData != null) {
-                    proceedToSend = true;
-                }
-            }
-        } else {
-            navigate(R.id.onboarding_fragment);
-        }
-    }
-
-    @Override
-    public void onPostCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
-        super.onPostCreate(savedInstanceState, persistentState);
-    }
-
-    private void navigate(int destination) {
-        FragmentActivity activity = this;
-        FragmentManager fm = activity.getSupportFragmentManager();
-        NavHostFragment navHostFragment =
-                (NavHostFragment) fm.findFragmentById(R.id.nav_host_fragment);
-        if (navHostFragment != null) {
-            navHostFragment.getNavController().navigate(destination);
-        }
-    }
-
-    public MoneroHandlerThread getThread() {
-        return thread;
-    }
-
-    public void init(File walletFile, String password) {
-        Wallet wallet = WalletManager.getInstance().openWallet(walletFile.getAbsolutePath(), password);
-        thread = new MoneroHandlerThread("WalletService", this, wallet);
-        new TxService(thread);
-        this.balanceService = new BalanceService(thread);
-        this.addressService = new AddressService(thread);
-        this.historyService = new HistoryService(thread);
-        this.blockchainService = new BlockchainService(thread);
-        this.utxoService = new UTXOService(thread);
-        thread.start();
-    }
-
-    @Override
-    public void onRefresh(boolean walletSynced) {
-        if(walletSynced)
-            this.utxoService.refreshUtxos();
-
-        this.historyService.refreshHistory();
-        this.balanceService.refreshBalance();
-        this.blockchainService.refreshBlockchain();
-        this.addressService.refreshAddresses();
-    }
-
-    @Override
-    public void onConnectionFail() {
-        runOnUiThread(() -> Toast.makeText(getApplication(), R.string.connection_failed, Toast.LENGTH_SHORT).show());
-    }
-
-    @Override
-    public void onPasswordSuccess(String password) {
-        File walletFile = new File(getApplicationInfo().dataDir, Constants.WALLET_NAME);
-        init(walletFile, password);
-        restartEvents.call();
-
-        if (proceedToSend) {
-            SendBottomSheetDialog sendDialog = new SendBottomSheetDialog();
-            sendDialog.uriData = uriData;
-            sendDialog.show(getSupportFragmentManager(), null);
-        }
-    }
-
-    @Override
-    public void onPasswordFail() {
-        runOnUiThread(() -> Toast.makeText(getApplication(), R.string.bad_password, Toast.LENGTH_SHORT).show());
-    }
-}

app/src/main/java/net/mynero/wallet/MainActivity.kt

@@ -0,0 +1,115 @@
+package net.mynero.wallet
+
+import android.os.Bundle
+import android.os.PersistableBundle
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentActivity
+import androidx.navigation.fragment.NavHostFragment
+import net.mynero.wallet.fragment.dialog.PasswordBottomSheetDialog
+import net.mynero.wallet.fragment.dialog.PasswordBottomSheetDialog.PasswordListener
+import net.mynero.wallet.fragment.dialog.SendBottomSheetDialog
+import net.mynero.wallet.livedata.SingleLiveEvent
+import net.mynero.wallet.model.WalletManager.Companion.instance
+import net.mynero.wallet.service.AddressService
+import net.mynero.wallet.service.BalanceService
+import net.mynero.wallet.service.BlockchainService
+import net.mynero.wallet.service.HistoryService
+import net.mynero.wallet.service.MoneroHandlerThread
+import net.mynero.wallet.service.PrefService
+import net.mynero.wallet.service.TxService
+import net.mynero.wallet.service.UTXOService
+import net.mynero.wallet.util.Constants
+import net.mynero.wallet.util.UriData
+import java.io.File
+
+class MainActivity : AppCompatActivity(), MoneroHandlerThread.Listener, PasswordListener {
+    @JvmField
+    val restartEvents: SingleLiveEvent<*> = SingleLiveEvent<Any?>()
+    var thread: MoneroHandlerThread? = null
+        private set
+    private var balanceService: BalanceService? = null
+    private var addressService: AddressService? = null
+    private var historyService: HistoryService? = null
+    private var blockchainService: BlockchainService? = null
+    private var utxoService: UTXOService? = null
+    private var proceedToSend = false
+    private var uriData: UriData? = null
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        val walletFile = File(applicationInfo.dataDir, Constants.WALLET_NAME)
+        val walletKeysFile = File(applicationInfo.dataDir, Constants.WALLET_NAME + ".keys")
+        if (walletKeysFile.exists()) {
+            val promptPassword =
+                PrefService.getInstance().getBoolean(Constants.PREF_USES_PASSWORD, false)
+            if (!promptPassword) {
+                init(walletFile, "")
+            } else {
+                val passwordDialog = PasswordBottomSheetDialog()
+                passwordDialog.listener = this
+                passwordDialog.show(supportFragmentManager, "password_dialog")
+            }
+            val intent = intent
+            val uri = intent.data
+            if (uri != null) {
+                uriData = UriData.parse(uri.toString())
+                if (uriData != null) {
+                    proceedToSend = true
+                }
+            }
+        } else {
+            navigate(R.id.onboarding_fragment)
+        }
+    }
+
+    private fun navigate(destination: Int) {
+        val activity: FragmentActivity = this
+        val fm = activity.supportFragmentManager
+        val navHostFragment = fm.findFragmentById(R.id.nav_host_fragment) as NavHostFragment?
+        navHostFragment?.navController?.navigate(destination)
+    }
+
+    fun init(walletFile: File, password: String?) {
+        val wallet = password?.let { instance?.openWallet(walletFile.absolutePath, it) }
+        thread = MoneroHandlerThread("WalletService", this, wallet)
+        TxService(thread)
+        balanceService = BalanceService(thread)
+        addressService = AddressService(thread)
+        historyService = HistoryService(thread)
+        blockchainService = BlockchainService(thread)
+        utxoService = UTXOService(thread)
+        thread?.start()
+    }
+
+    override fun onRefresh(walletSynced: Boolean) {
+        if (walletSynced) utxoService?.refreshUtxos()
+        historyService?.refreshHistory()
+        balanceService?.refreshBalance()
+        blockchainService?.refreshBlockchain()
+        addressService?.refreshAddresses()
+    }
+
+    override fun onConnectionFail() {
+        runOnUiThread {
+            Toast.makeText(application, R.string.connection_failed, Toast.LENGTH_SHORT).show()
+        }
+    }
+
+    override fun onPasswordSuccess(password: String) {
+        val walletFile = File(applicationInfo.dataDir, Constants.WALLET_NAME)
+        init(walletFile, password)
+        restartEvents.call()
+        if (proceedToSend) {
+            val sendDialog = SendBottomSheetDialog()
+            sendDialog.uriData = uriData
+            sendDialog.show(supportFragmentManager, null)
+        }
+    }
+
+    override fun onPasswordFail() {
+        runOnUiThread {
+            Toast.makeText(application, R.string.bad_password, Toast.LENGTH_SHORT).show()
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/MoneroApplication.java

@@ -1,24 +0,0 @@
-package net.mynero.wallet;
-
-import android.app.Application;
-
-import net.mynero.wallet.service.PrefService;
-import net.mynero.wallet.util.NightmodeHelper;
-
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-
-public class MoneroApplication extends Application {
-    private ExecutorService executor = null;
-    @Override
-    public void onCreate() {
-        super.onCreate();
-        new PrefService(this);
-        NightmodeHelper.getAndSetPreferredNightmode();
-        executor = Executors.newFixedThreadPool(16);
-    }
-
-    public ExecutorService getExecutor() {
-        return executor;
-    }
-}

app/src/main/java/net/mynero/wallet/MoneroApplication.kt

@@ -0,0 +1,19 @@
+package net.mynero.wallet
+
+import android.app.Application
+import net.mynero.wallet.service.PrefService
+import net.mynero.wallet.util.NightmodeHelper
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
+
+class MoneroApplication : Application() {
+    var executor: ExecutorService? = null
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+        PrefService(this)
+        NightmodeHelper.preferredNightmode
+        executor = Executors.newFixedThreadPool(16)
+    }
+}

app/src/main/java/net/mynero/wallet/adapter/CoinsInfoAdapter.java

@@ -60,7 +60,7 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
     }
 
     public void deselectUtxo(CoinsInfo coinsInfo) {
-        this.selectedUtxos.remove(coinsInfo.getPubKey());
+        this.selectedUtxos.remove(coinsInfo.pubKey);
 
         if(this.selectedUtxos.size() == 0) {
             editing = false;
@@ -71,12 +71,12 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
 
     public void selectUtxo(CoinsInfo coinsInfo) {
         editing = true;
-        this.selectedUtxos.put(coinsInfo.getPubKey(), coinsInfo);
+        this.selectedUtxos.put(coinsInfo.pubKey, coinsInfo);
         notifyDataSetChanged();
     }
 
     public boolean contains(CoinsInfo coinsInfo) {
-        return selectedUtxos.containsKey(coinsInfo.getPubKey());
+        return selectedUtxos.containsKey(coinsInfo.pubKey);
     }
 
     public void clear() {
@@ -135,7 +135,7 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
         public void bind(boolean editing, CoinsInfo coinsInfo, HashMap<String, CoinsInfo> selectedUtxos) {
             this.editing = editing;
             this.coinsInfo = coinsInfo;
-            boolean selected = selectedUtxos.containsKey(coinsInfo.getPubKey());
+            boolean selected = selectedUtxos.containsKey(coinsInfo.pubKey);
 
             TextView pubKeyTextView = itemView.findViewById(R.id.utxo_pub_key_textview);
             TextView amountTextView = itemView.findViewById(R.id.utxo_amount_textview);
@@ -143,12 +143,12 @@ public class CoinsInfoAdapter extends RecyclerView.Adapter<CoinsInfoAdapter.View
             TextView globalIdxTextView = itemView.findViewById(R.id.utxo_global_index_textview);
             TextView outpointTextView = itemView.findViewById(R.id.utxo_outpoint_textview);
             boolean streetModeEnabled = PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false);
-            String balanceString = streetModeEnabled ? Constants.STREET_MODE_BALANCE : Wallet.getDisplayAmount(coinsInfo.getAmount());
+            String balanceString = streetModeEnabled ? Constants.STREET_MODE_BALANCE : Wallet.getDisplayAmount(coinsInfo.amount);
             amountTextView.setText(itemView.getResources().getString(R.string.tx_amount_no_prefix, balanceString));
-            pubKeyTextView.setText(coinsInfo.getPubKey());
+            pubKeyTextView.setText(coinsInfo.pubKey);
-            addressTextView.setText(coinsInfo.getAddress());
+            addressTextView.setText(coinsInfo.address);
-            globalIdxTextView.setText(itemView.getResources().getString(R.string.global_index_text, coinsInfo.getGlobalOutputIndex()));
+            globalIdxTextView.setText(itemView.getResources().getString(R.string.global_index_text, coinsInfo.globalOutputIndex));
-            outpointTextView.setText(itemView.getResources().getString(R.string.outpoint_text, coinsInfo.getHash() + ":" + coinsInfo.getLocalOutputIndex()));
+            outpointTextView.setText(itemView.getResources().getString(R.string.outpoint_text, coinsInfo.hash + ":" + coinsInfo.localOutputIndex));
             if (selected) {
                 itemView.setBackgroundTintList(ContextCompat.getColorStateList(itemView.getContext(), R.color.oled_colorSecondary));
             } else if(coinsInfo.isFrozen() || UTXOService.instance.isCoinFrozen(coinsInfo)) {

app/src/main/java/net/mynero/wallet/adapter/SubaddressAdapter.java

@@ -99,14 +99,14 @@ public class SubaddressAdapter extends RecyclerView.Adapter<SubaddressAdapter.Vi
             TextView addressLabelTextView = itemView.findViewById(R.id.address_label_textview);
             TextView addressAmountTextView = itemView.findViewById(R.id.address_amount_textview);
 
-            addressTextView.setText(subaddress.getAddress());
+            addressTextView.setText(subaddress.address);
 
             final String label = subaddress.getDisplayLabel();
             final String address = itemView.getContext().getString(R.string.subbaddress_info_subtitle,
-                    subaddress.getAddressIndex(), subaddress.getSquashedAddress());
+                    subaddress.addressIndex, subaddress.getSquashedAddress());
             addressLabelTextView.setText(label.isEmpty() ? address : label);
 
-            final long amount = subaddress.getAmount();
+            final long amount = subaddress.amount;
             if (amount > 0) {
                 boolean streetMode = PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false);
                 if(streetMode) {

app/src/main/java/net/mynero/wallet/adapter/TransactionInfoAdapter.java

@@ -30,9 +30,7 @@ import androidx.recyclerview.widget.RecyclerView;
 import com.google.android.material.progressindicator.CircularProgressIndicator;
 
 import net.mynero.wallet.R;
-import net.mynero.wallet.data.UserNotes;
 import net.mynero.wallet.model.TransactionInfo;
-import net.mynero.wallet.model.Wallet;
 import net.mynero.wallet.service.PrefService;
 import net.mynero.wallet.util.Constants;
 import net.mynero.wallet.util.Helper;

app/src/main/java/net/mynero/wallet/data/DefaultNodes.java

@@ -1,82 +0,0 @@
-/*
- * Copyright (c) 2020 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.data;
-
-// Nodes stolen from https://moneroworld.com/#nodes
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.io.UnsupportedEncodingException;
-import java.net.URLEncoder;
-
-import timber.log.Timber;
-
-public enum DefaultNodes {
-    SAMOURAI("163.172.56.213", 18089, "mainnet", "SamouraiWallet"),
-    MONERUJO("nodex.monerujo.io", 18081, "mainnet", "monerujo"),
-    SUPPORTXMR("node.supportxmr.com", 18081, "mainnet", "SupportXMR"),
-    HASHVAULT("nodes.hashvault.pro", 18081, "mainnet", "Hashvault"),
-    MONEROWORLD("node.moneroworld.com", 18089, "mainnet", "MoneroWorld"),
-    XMRTW("opennode.xmr-tw.org", 18089, "mainnet", "XMRTW"),
-    MYNERO_I2P("ynk3hrwte23asonojqeskoulek2g2cd6tqg4neghnenfyljrvhga.b32.i2p", 0, "mainnet", "node.mysu.i2p"),
-    MYNERO_ONION("tiopyrxseconw73thwlv2pf5hebfcqxj5zdolym7z6pbq6gl4z7xz4ad.onion", 18081, "mainnet", "node.mysu.onion"),
-    SAMOURAI_ONION("446unwib5vc7pfbzflosy6m6vtyuhddnalr3hutyavwe4esfuu5g6ryd.onion", 18089, "mainnet", "SamouraiWallet.onion"),
-    MONERUJO_ONION("monerujods7mbghwe6cobdr6ujih6c22zu5rl7zshmizz2udf7v7fsad.onion", 18081, "mainnet", "monerujo.onion"),
-    Criminales78("56wl7y2ebhamkkiza4b7il4mrzwtyvpdym7bm2bkg3jrei2je646k3qd.onion", 18089, "mainnet", "Criminales78.onion"),
-    xmrfail("mxcd4577fldb3ppzy7obmmhnu3tf57gbcbd4qhwr2kxyjj2qi3dnbfqd.onion", 18081, "mainnet", "xmrfail.onion"),
-    boldsuck("6dsdenp6vjkvqzy4wzsnzn6wixkdzihx3khiumyzieauxuxslmcaeiad.onion", 18081, "mainnet", "boldsuck.onion");
-
-    private final String address;
-    private final int port;
-    private final String network;
-    private final String name;
-
-    DefaultNodes(String address, int port, String network, String name) {
-        this.address = address;
-        this.port = port;
-        this.network = network;
-        this.name = name;
-    }
-
-    public String getNodeString() {
-        return address + ":" + port + "/" + network + "/" + name;
-    }
-
-    public JSONObject getJson() {
-        JSONObject jsonObject = new JSONObject();
-        try {
-            jsonObject.put("host", address);
-            jsonObject.put("rpcPort", port);
-            jsonObject.put("network", network);
-            if (!name.isEmpty())
-                jsonObject.put("name", name);
-        } catch (JSONException e) {
-            throw new RuntimeException(e);
-        }
-
-        return jsonObject;
-    }
-
-    public String getAddress() {
-        return address;
-    }
-
-    public String getName() {
-        return name;
-    }
-}

app/src/main/java/net/mynero/wallet/data/DefaultNodes.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.data
+
+import org.json.JSONException
+import org.json.JSONObject
+
+// Nodes stolen from https://moneroworld.com/#nodes
+enum class DefaultNodes(val address: String, private val port: Int, private val network: String, private val nodeName: String) {
+    SAMOURAI("163.172.56.213", 18089, "mainnet", "SamouraiWallet"), MONERUJO("nodex.monerujo.io", 18081, "mainnet", "monerujo"), SUPPORTXMR("node.supportxmr.com", 18081, "mainnet", "SupportXMR"), HASHVAULT("nodes.hashvault.pro", 18081, "mainnet", "Hashvault"), MONEROWORLD("node.moneroworld.com", 18089, "mainnet", "MoneroWorld"), XMRTW("opennode.xmr-tw.org", 18089, "mainnet", "XMRTW"), MYNERO_I2P("ynk3hrwte23asonojqeskoulek2g2cd6tqg4neghnenfyljrvhga.b32.i2p", 0, "mainnet", "node.mysu.i2p"), MYNERO_ONION("tiopyrxseconw73thwlv2pf5hebfcqxj5zdolym7z6pbq6gl4z7xz4ad.onion", 18081, "mainnet", "node.mysu.onion"), SAMOURAI_ONION("446unwib5vc7pfbzflosy6m6vtyuhddnalr3hutyavwe4esfuu5g6ryd.onion", 18089, "mainnet", "SamouraiWallet.onion"), MONERUJO_ONION("monerujods7mbghwe6cobdr6ujih6c22zu5rl7zshmizz2udf7v7fsad.onion", 18081, "mainnet", "monerujo.onion"), Criminales78("56wl7y2ebhamkkiza4b7il4mrzwtyvpdym7bm2bkg3jrei2je646k3qd.onion", 18089, "mainnet", "Criminales78.onion"), xmrfail("mxcd4577fldb3ppzy7obmmhnu3tf57gbcbd4qhwr2kxyjj2qi3dnbfqd.onion", 18081, "mainnet", "xmrfail.onion"), boldsuck("6dsdenp6vjkvqzy4wzsnzn6wixkdzihx3khiumyzieauxuxslmcaeiad.onion", 18081, "mainnet", "boldsuck.onion");
+
+    val nodeString: String
+        get() = "$address:$port/$network/$nodeName"
+    val json: JSONObject
+        get() {
+            val jsonObject = JSONObject()
+            try {
+                jsonObject.put("host", address)
+                jsonObject.put("rpcPort", port)
+                jsonObject.put("network", network)
+                if (nodeName.isNotEmpty()) jsonObject.put("name", nodeName)
+            } catch (e: JSONException) {
+                throw RuntimeException(e)
+            }
+            return jsonObject
+        }
+}

app/src/main/java/net/mynero/wallet/data/Node.java

@@ -1,382 +0,0 @@
-/*
- * Copyright (c) 2018 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.data;
-
-import net.mynero.wallet.model.NetworkType;
-import net.mynero.wallet.model.WalletManager;
-import net.mynero.wallet.util.OnionHelper;
-
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.io.UnsupportedEncodingException;
-import java.net.InetSocketAddress;
-import java.net.URLDecoder;
-import java.net.URLEncoder;
-import java.net.UnknownHostException;
-
-import timber.log.Timber;
-
-public class Node {
-    static public final String MAINNET = "mainnet";
-    static public final String STAGENET = "stagenet";
-    static public final String TESTNET = "testnet";
-    static private int DEFAULT_LEVIN_PORT = 0;
-    static private int DEFAULT_RPC_PORT = 0;
-    private NetworkType networkType;
-    private final boolean selected = false;
-    int rpcPort = 0;
-    private String name = null;
-    private String host;
-    private int levinPort = 0;
-    private String username = "";
-    private String password = "";
-    private boolean favourite = false;
-
-
-    public NetworkType getNetworkType() {
-        return networkType;
-    }
-
-    public String getUsername() {
-        return this.username;
-    }
-
-    public String getPassword() {
-        return this.password;
-    }
-
-    public String getName() {
-        return this.name;
-    }
-
-    Node(String nodeString) {
-        if ((nodeString == null) || nodeString.isEmpty())
-            throw new IllegalArgumentException("daemon is empty");
-        String daemonAddress;
-        String[] a = nodeString.split("@");
-        if (a.length == 1) { // no credentials
-            daemonAddress = a[0];
-            username = "";
-            password = "";
-        } else if (a.length == 2) { // credentials
-            String[] userPassword = a[0].split(":");
-            if (userPassword.length != 2)
-                throw new IllegalArgumentException("User:Password invalid");
-            username = userPassword[0];
-            if (!username.isEmpty()) {
-                password = userPassword[1];
-            } else {
-                password = "";
-            }
-            daemonAddress = a[1];
-        } else {
-            throw new IllegalArgumentException("Too many @");
-        }
-
-        String[] daParts = daemonAddress.split("/");
-        if ((daParts.length > 3) || (daParts.length < 1))
-            throw new IllegalArgumentException("Too many '/' or too few");
-
-        daemonAddress = daParts[0];
-        String[] da = daemonAddress.split(":");
-        if ((da.length > 2) || (da.length < 1))
-            throw new IllegalArgumentException("Too many ':' or too few");
-        String host = da[0];
-
-        if (daParts.length == 1) {
-            networkType = NetworkType.NetworkType_Mainnet;
-        } else {
-            switch (daParts[1]) {
-                case MAINNET:
-                    networkType = NetworkType.NetworkType_Mainnet;
-                    break;
-                case STAGENET:
-                    networkType = NetworkType.NetworkType_Stagenet;
-                    break;
-                case TESTNET:
-                    networkType = NetworkType.NetworkType_Testnet;
-                    break;
-                default:
-                    throw new IllegalArgumentException("invalid net: " + daParts[1]);
-            }
-        }
-        if (networkType != WalletManager.getInstance().getNetworkType())
-            throw new IllegalArgumentException("wrong net: " + networkType);
-
-        String name = host;
-        if (daParts.length == 3) {
-            try {
-                name = URLDecoder.decode(daParts[2], "UTF-8");
-            } catch (UnsupportedEncodingException ex) {
-                Timber.w(ex); // if we can't encode it, we don't use it
-            }
-        }
-        this.name = name;
-
-        int port;
-        if (da.length == 2) {
-            try {
-                port = Integer.parseInt(da[1]);
-            } catch (NumberFormatException ex) {
-                throw new IllegalArgumentException("Port not numeric");
-            }
-        } else {
-            port = getDefaultRpcPort();
-        }
-        try {
-            setHost(host);
-        } catch (UnknownHostException ex) {
-            throw new IllegalArgumentException("cannot resolve host " + host);
-        }
-        this.rpcPort = port;
-        this.levinPort = getDefaultLevinPort();
-    }
-
-    Node(JSONObject jsonObject) throws JSONException, UnknownHostException {
-        if (jsonObject == null)
-            throw new IllegalArgumentException("daemon is empty");
-        if(jsonObject.has("username")) {
-            username = jsonObject.getString("username");
-        }
-        if(jsonObject.has("password")) {
-            password = jsonObject.getString("password");
-        }
-        if(jsonObject.has("host")) {
-            setHost(jsonObject.getString("host"));
-        }
-        if(jsonObject.has("rpcPort")) {
-            this.rpcPort = jsonObject.getInt("rpcPort");
-        } else {
-            this.rpcPort = getDefaultRpcPort();
-        }
-        if(jsonObject.has("name")) {
-            this.name = jsonObject.getString("name");
-        }
-
-        if(jsonObject.has("network")) {
-            switch (jsonObject.getString("network")) {
-                case MAINNET:
-                    networkType = NetworkType.NetworkType_Mainnet;
-                    break;
-                case STAGENET:
-                    networkType = NetworkType.NetworkType_Stagenet;
-                    break;
-                case TESTNET:
-                    networkType = NetworkType.NetworkType_Testnet;
-                    break;
-                default:
-                    throw new IllegalArgumentException("invalid net: " + jsonObject.getString("network"));
-            }
-
-            if (networkType != WalletManager.getInstance().getNetworkType())
-                throw new IllegalArgumentException("wrong net: " + networkType);
-        }
-    }
-
-    public Node() {
-        this.networkType = WalletManager.getInstance().getNetworkType();
-    }
-
-    // constructor used for created nodes from retrieved peer lists
-    public Node(InetSocketAddress socketAddress) {
-        this();
-        this.host = socketAddress.getHostString();
-        this.rpcPort = 0; // unknown
-        this.levinPort = socketAddress.getPort();
-        this.username = "";
-        this.password = "";
-    }
-
-    public Node(Node anotherNode) {
-        networkType = anotherNode.networkType;
-        overwriteWith(anotherNode);
-    }
-
-    static public Node fromString(String nodeString) {
-        try {
-            return new Node(nodeString);
-        } catch (IllegalArgumentException ex) {
-            Timber.w(ex);
-            return null;
-        }
-    }
-
-    static public Node fromJson(JSONObject jsonObject) {
-        try {
-            return new Node(jsonObject);
-        } catch (IllegalArgumentException | UnknownHostException | JSONException ex) {
-            Timber.w(ex);
-            return null;
-        }
-    }
-
-    // every node knows its network, but they are all the same
-    static public int getDefaultLevinPort() {
-        if (DEFAULT_LEVIN_PORT > 0) return DEFAULT_LEVIN_PORT;
-        switch (WalletManager.getInstance().getNetworkType()) {
-            case NetworkType_Mainnet:
-                DEFAULT_LEVIN_PORT = 18080;
-                break;
-            case NetworkType_Testnet:
-                DEFAULT_LEVIN_PORT = 28080;
-                break;
-            case NetworkType_Stagenet:
-                DEFAULT_LEVIN_PORT = 38080;
-                break;
-            default:
-                throw new IllegalStateException("unsupported net " + WalletManager.getInstance().getNetworkType());
-        }
-        return DEFAULT_LEVIN_PORT;
-    }
-
-    // every node knows its network, but they are all the same
-    static public int getDefaultRpcPort() {
-        if (DEFAULT_RPC_PORT > 0) return DEFAULT_RPC_PORT;
-        switch (WalletManager.getInstance().getNetworkType()) {
-            case NetworkType_Mainnet:
-                DEFAULT_RPC_PORT = 18081;
-                break;
-            case NetworkType_Testnet:
-                DEFAULT_RPC_PORT = 28081;
-                break;
-            case NetworkType_Stagenet:
-                DEFAULT_RPC_PORT = 38081;
-                break;
-            default:
-                throw new IllegalStateException("unsupported net " + WalletManager.getInstance().getNetworkType());
-        }
-        return DEFAULT_RPC_PORT;
-    }
-
-    @Override
-    public int hashCode() {
-        return host.hashCode();
-    }
-
-    // Nodes are equal if they are the same host address:port & are on the same network
-    @Override
-    public boolean equals(Object other) {
-        if (!(other instanceof Node)) return false;
-        final Node anotherNode = (Node) other;
-        return (host.equals(anotherNode.host)
-                && (getAddress().equals(anotherNode.getAddress()))
-                && (rpcPort == anotherNode.rpcPort)
-                && (networkType == anotherNode.networkType))
-                && (username.equals(anotherNode.getUsername()))
-                && (password.equals(anotherNode.getPassword()));
-    }
-
-    public boolean isOnion() {
-        return OnionHelper.isOnionHost(host);
-    }
-
-    public boolean isI2P() {
-        return OnionHelper.isI2PHost(host);
-    }
-
-    public String toNodeString() {
-        return toString();
-    }
-
-    public JSONObject toJson() {
-        JSONObject jsonObject = new JSONObject();
-        try {
-            if (!username.isEmpty() && !password.isEmpty()) {
-                jsonObject.put("username", username);
-                jsonObject.put("password", password);
-            }
-            jsonObject.put("host", host);
-            jsonObject.put("rpcPort", rpcPort);
-            switch (networkType) {
-                case NetworkType_Mainnet:
-                    jsonObject.put("network", MAINNET);
-                    break;
-                case NetworkType_Stagenet:
-                    jsonObject.put("network", STAGENET);
-                    break;
-                case NetworkType_Testnet:
-                    jsonObject.put("network", TESTNET);
-                    break;
-            }
-            if (!name.isEmpty())
-                jsonObject.put("name", name);
-        } catch (JSONException e) {
-            throw new RuntimeException(e);
-        }
-
-        return jsonObject;
-    }
-
-    @Override
-    public String toString() {
-        StringBuilder sb = new StringBuilder();
-        if (!username.isEmpty() && !password.isEmpty()) {
-            sb.append(username).append(":").append(password).append("@");
-        }
-        sb.append(host).append(":").append(rpcPort);
-        sb.append("/");
-        switch (networkType) {
-            case NetworkType_Mainnet:
-                sb.append(MAINNET);
-                break;
-            case NetworkType_Stagenet:
-                sb.append(STAGENET);
-                break;
-            case NetworkType_Testnet:
-                sb.append(TESTNET);
-                break;
-        }
-        if (name != null)
-            try {
-                sb.append("/").append(URLEncoder.encode(name, "UTF-8"));
-            } catch (UnsupportedEncodingException ex) {
-                Timber.w(ex); // if we can't encode it, we don't store it
-            }
-        return sb.toString();
-    }
-
-    public String getAddress() {
-        return getHost() + ":" + getRpcPort();
-    }
-
-    public String getHost() {
-        return host;
-    }
-
-    public int getRpcPort() {
-        return rpcPort;
-    }
-
-    public void setHost(String host) throws UnknownHostException {
-        if ((host == null) || (host.isEmpty()))
-            throw new UnknownHostException("loopback not supported (yet?)");
-        this.host = host;
-    }
-
-    public void overwriteWith(Node anotherNode) {
-        if (networkType != anotherNode.networkType)
-            throw new IllegalStateException("network types do not match");
-        name = anotherNode.name;
-        host = anotherNode.host;
-        rpcPort = anotherNode.rpcPort;
-        levinPort = anotherNode.levinPort;
-        username = anotherNode.username;
-        password = anotherNode.password;
-        favourite = anotherNode.favourite;
-    }
-}

app/src/main/java/net/mynero/wallet/data/Node.kt

@@ -0,0 +1,295 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.data
+
+import net.mynero.wallet.model.NetworkType
+import net.mynero.wallet.model.WalletManager
+import net.mynero.wallet.util.OnionHelper
+import org.json.JSONException
+import org.json.JSONObject
+import timber.log.Timber
+import java.io.UnsupportedEncodingException
+import java.net.InetSocketAddress
+import java.net.URLDecoder
+import java.net.URLEncoder
+import java.net.UnknownHostException
+
+class Node {
+    var networkType: NetworkType? = null
+        private set
+    var rpcPort = 0
+    var name: String? = null
+        private set
+    var host: String? = null
+    private var levinPort = 0
+    var username = ""
+        private set
+    var password = ""
+        private set
+    private var favourite = false
+
+    internal constructor(nodeString: String?) {
+        require(!nodeString.isNullOrEmpty()) { "daemon is empty" }
+        var daemonAddress: String
+        val a = nodeString.split("@".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+        when (a.size) {
+            1 -> { // no credentials
+                daemonAddress = a[0]
+                this.username = ""
+                this.password = ""
+            }
+            2 -> { // credentials
+                val userPassword = a[0].split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+                require(userPassword.size == 2) { "User:Password invalid" }
+                this.username = userPassword[0]
+                this.password = if (this.username.isNotEmpty()) {
+                    userPassword[1]
+                } else {
+                    ""
+                }
+                daemonAddress = a[1]
+            }
+            else -> {
+                throw IllegalArgumentException("Too many @")
+            }
+        }
+        val daParts = daemonAddress.split("/".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+        require(!(daParts.size > 3 || daParts.isEmpty())) { "Too many '/' or too few" }
+        daemonAddress = daParts[0]
+        val da = daemonAddress.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+        require(!(da.size > 2 || da.isEmpty())) { "Too many ':' or too few" }
+        val host = da[0]
+        this.networkType = if (daParts.size == 1) {
+            NetworkType.NetworkType_Mainnet
+        } else {
+            when (daParts[1]) {
+                MAINNET -> NetworkType.NetworkType_Mainnet
+                STAGENET -> NetworkType.NetworkType_Stagenet
+                TESTNET -> NetworkType.NetworkType_Testnet
+                else -> throw IllegalArgumentException("invalid net: " + daParts[1])
+            }
+        }
+        require(networkType == WalletManager.instance?.networkType) { "wrong net: $networkType" }
+        var name: String? = host
+        if (daParts.size == 3) {
+            try {
+                name = URLDecoder.decode(daParts[2], "UTF-8")
+            } catch (ex: UnsupportedEncodingException) {
+                Timber.w(ex) // if we can't encode it, we don't use it
+            }
+        }
+        this.name = name
+        val port: Int = if (da.size == 2) {
+            try {
+                da[1].toInt()
+            } catch (ex: NumberFormatException) {
+                throw IllegalArgumentException("Port not numeric")
+            }
+        } else {
+            this.defaultRpcPort
+        }
+        try {
+            this.host = host
+        } catch (ex: UnknownHostException) {
+            throw IllegalArgumentException("cannot resolve host $host")
+        }
+        this.rpcPort = port
+        this.levinPort = this.defaultLevinPort
+    }
+
+    internal constructor(jsonObject: JSONObject?) {
+        requireNotNull(jsonObject) { "daemon is empty" }
+        if (jsonObject.has("username")) {
+            username = jsonObject.getString("username")
+        }
+        if (jsonObject.has("password")) {
+            password = jsonObject.getString("password")
+        }
+        if (jsonObject.has("host")) {
+            this.host = jsonObject.getString("host")
+        }
+        this.rpcPort = if (jsonObject.has("rpcPort")) {
+            jsonObject.getInt("rpcPort")
+        } else {
+            defaultRpcPort
+        }
+        if (jsonObject.has("name")) {
+            this.name = jsonObject.getString("name")
+        }
+        if (jsonObject.has("network")) {
+            networkType = when (jsonObject.getString("network")) {
+                MAINNET -> NetworkType.NetworkType_Mainnet
+                STAGENET -> NetworkType.NetworkType_Stagenet
+                TESTNET -> NetworkType.NetworkType_Testnet
+                else -> throw IllegalArgumentException("invalid net: " + jsonObject.getString("network"))
+            }
+            require(networkType == WalletManager.instance?.networkType) { "wrong net: $networkType" }
+        }
+    }
+
+    constructor() {
+        networkType = WalletManager.instance?.networkType
+    }
+
+    // constructor used for created nodes from retrieved peer lists
+    constructor(socketAddress: InetSocketAddress) : this() {
+        host = socketAddress.hostString
+        rpcPort = 0 // unknown
+        levinPort = socketAddress.port
+        username = ""
+        password = ""
+    }
+
+    constructor(anotherNode: Node) {
+        networkType = anotherNode.networkType
+        overwriteWith(anotherNode)
+    }
+
+    override fun hashCode(): Int {
+        return host.hashCode()
+    }
+
+    // Nodes are equal if they are the same host address:port & are on the same network
+    override fun equals(other: Any?): Boolean {
+        if (other !is Node) return false
+        return host == other.host && address == other.address && rpcPort == other.rpcPort && networkType == other.networkType && username == other.username && password == other.password
+    }
+
+    val isOnion: Boolean
+        get() = host?.let { OnionHelper.isOnionHost(it) } == true
+    val isI2P: Boolean
+        get() = host?.let { OnionHelper.isI2PHost(it) } == true
+
+    fun toNodeString(): String {
+        return toString()
+    }
+
+    fun toJson(): JSONObject {
+        val jsonObject = JSONObject()
+        try {
+            if (username.isNotEmpty() && password.isNotEmpty()) {
+                jsonObject.put("username", username)
+                jsonObject.put("password", password)
+            }
+            jsonObject.put("host", host)
+            jsonObject.put("rpcPort", rpcPort)
+            when (networkType) {
+                NetworkType.NetworkType_Mainnet -> jsonObject.put("network", MAINNET)
+                NetworkType.NetworkType_Stagenet -> jsonObject.put("network", STAGENET)
+                NetworkType.NetworkType_Testnet -> jsonObject.put("network", TESTNET)
+                null -> TODO()
+            }
+            if (name?.isNotEmpty() == true) jsonObject.put("name", name)
+        } catch (e: JSONException) {
+            throw RuntimeException(e)
+        }
+        return jsonObject
+    }
+
+    override fun toString(): String {
+        val sb = StringBuilder()
+        if (username.isNotEmpty() && password.isNotEmpty()) {
+            sb.append(username).append(":").append(password).append("@")
+        }
+        sb.append(host).append(":").append(rpcPort)
+        sb.append("/")
+        when (networkType) {
+            NetworkType.NetworkType_Mainnet -> sb.append(MAINNET)
+            NetworkType.NetworkType_Stagenet -> sb.append(STAGENET)
+            NetworkType.NetworkType_Testnet -> sb.append(TESTNET)
+            null -> TODO()
+        }
+        if (name != null) try {
+            sb.append("/").append(URLEncoder.encode(name, "UTF-8"))
+        } catch (ex: UnsupportedEncodingException) {
+            Timber.w(ex) // if we can't encode it, we don't store it
+        }
+        return sb.toString()
+    }
+
+    val address: String
+        get() = "$host:$rpcPort"
+
+    private fun overwriteWith(anotherNode: Node) {
+        check(networkType == anotherNode.networkType) { "network types do not match" }
+        name = anotherNode.name
+        host = anotherNode.host
+        rpcPort = anotherNode.rpcPort
+        levinPort = anotherNode.levinPort
+        username = anotherNode.username
+        password = anotherNode.password
+        favourite = anotherNode.favourite
+    }
+
+    companion object {
+        const val MAINNET = "mainnet"
+        const val STAGENET = "stagenet"
+        const val TESTNET = "testnet"
+        private var DEFAULT_LEVIN_PORT = 0
+        private var DEFAULT_RPC_PORT = 0
+        @JvmStatic
+        fun fromString(nodeString: String?): Node? {
+            return try {
+                Node(nodeString)
+            } catch (ex: IllegalArgumentException) {
+                Timber.w(ex)
+                null
+            }
+        }
+
+        @JvmStatic
+        fun fromJson(jsonObject: JSONObject?): Node? {
+            return try {
+                Node(jsonObject)
+            } catch (ex: IllegalArgumentException) {
+                Timber.w(ex)
+                null
+            } catch (ex: UnknownHostException) {
+                Timber.w(ex)
+                null
+            } catch (ex: JSONException) {
+                Timber.w(ex)
+                null
+            }
+        }
+    }
+
+    private val defaultRpcPort: Int
+        // every node knows its network, but they are all the same
+        get() {
+            if (DEFAULT_RPC_PORT > 0) return DEFAULT_RPC_PORT
+            DEFAULT_RPC_PORT = when (WalletManager.instance?.networkType) {
+                NetworkType.NetworkType_Mainnet -> 18081
+                NetworkType.NetworkType_Testnet -> 28081
+                NetworkType.NetworkType_Stagenet -> 38081
+                else -> throw IllegalStateException("unsupported net " + WalletManager.instance?.networkType)
+            }
+            return DEFAULT_RPC_PORT
+        }
+
+    private val defaultLevinPort: Int
+        // every node knows its network, but they are all the same
+        get() {
+            if (DEFAULT_LEVIN_PORT > 0) return DEFAULT_LEVIN_PORT
+            DEFAULT_LEVIN_PORT = when (WalletManager.instance?.networkType) {
+                NetworkType.NetworkType_Mainnet -> 18080
+                NetworkType.NetworkType_Testnet -> 28080
+                NetworkType.NetworkType_Stagenet -> 38080
+                else -> throw IllegalStateException("unsupported net " + WalletManager.instance?.networkType)
+            }
+            return DEFAULT_LEVIN_PORT
+        }
+}

app/src/main/java/net/mynero/wallet/data/Subaddress.java

@@ -1,78 +0,0 @@
-/*
- * Copyright (c) 2018 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.data;
-
-import java.util.regex.Pattern;
-
-public class Subaddress implements Comparable<Subaddress> {
-    public static final Pattern DEFAULT_LABEL_FORMATTER = Pattern.compile("^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}:[0-9]{2}:[0-9]{2}$");
-    final private int accountIndex;
-    final private int addressIndex;
-    final private String address;
-    private final String label;
-    private long amount;
-
-    public Subaddress(int accountIndex, int addressIndex, String address, String label) {
-        this.accountIndex = accountIndex;
-        this.addressIndex = addressIndex;
-        this.address = address;
-        this.label = label;
-    }
-
-    @Override
-    public int compareTo(Subaddress another) { // newer is <
-        final int compareAccountIndex = another.accountIndex - accountIndex;
-        if (compareAccountIndex == 0)
-            return another.addressIndex - addressIndex;
-        return compareAccountIndex;
-    }
-
-    public String getSquashedAddress() {
-        return address.substring(0, 8) + "…" + address.substring(address.length() - 8);
-    }
-
-    public String getDisplayLabel() {
-        if (label.isEmpty() || (DEFAULT_LABEL_FORMATTER.matcher(label).matches()))
-            return ("#" + addressIndex);
-        else
-            return label;
-    }
-
-    public long getAmount() {
-        return amount;
-    }
-
-    public String getAddress() {
-        return address;
-    }
-
-    public int getAccountIndex() {
-        return accountIndex;
-    }
-
-    public int getAddressIndex() {
-        return addressIndex;
-    }
-
-    public String getLabel() {
-        return label;
-    }
-
-    public void setAmount(long amount) {
-        this.amount = amount;
-    }
-}

app/src/main/java/net/mynero/wallet/data/Subaddress.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.data
+
+import java.util.regex.Pattern
+
+class Subaddress(private val accountIndex: Int, @JvmField val addressIndex: Int, @JvmField val address: String, val label: String) : Comparable<Subaddress> {
+    @JvmField
+    var amount: Long = 0
+
+    override fun compareTo(other: Subaddress): Int { // newer is <
+        val compareAccountIndex = other.accountIndex - accountIndex
+        return if (compareAccountIndex == 0) other.addressIndex - addressIndex else compareAccountIndex
+    }
+
+    val squashedAddress: String
+        get() = address.substring(0, 8) + "…" + address.substring(address.length - 8)
+    val displayLabel: String
+        get() = if (label.isEmpty() || DEFAULT_LABEL_FORMATTER.matcher(label).matches()) "#$addressIndex" else label
+
+    companion object {
+        @JvmField
+        val DEFAULT_LABEL_FORMATTER: Pattern = Pattern.compile("^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}:[0-9]{2}:[0-9]{2}$")
+    }
+}

app/src/main/java/net/mynero/wallet/data/TxData.java

@@ -1,157 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.data;
-
-import android.os.Parcel;
-import android.os.Parcelable;
-
-import net.mynero.wallet.model.PendingTransaction;
-import net.mynero.wallet.model.Wallet;
-import net.mynero.wallet.util.Helper;
-
-import java.util.ArrayList;
-
-// https://stackoverflow.com/questions/2139134/how-to-send-an-object-from-one-android-activity-to-another-using-intents
-public class TxData implements Parcelable {
-
-    // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
-    public static final Parcelable.Creator<TxData> CREATOR = new Parcelable.Creator<TxData>() {
-        public TxData createFromParcel(Parcel in) {
-            return new TxData(in);
-        }
-
-        public TxData[] newArray(int size) {
-            return new TxData[size];
-        }
-    };
-    private String dstAddr;
-    private long amount;
-    private int mixin;
-    private PendingTransaction.Priority priority;
-    private UserNotes userNotes;
-    private ArrayList<String> preferredInputs;
-
-    public TxData() {
-    }
-
-    public TxData(TxData txData) {
-        this.dstAddr = txData.dstAddr;
-        this.amount = txData.amount;
-        this.mixin = txData.mixin;
-        this.priority = txData.priority;
-        this.preferredInputs = txData.preferredInputs;
-    }
-
-    public TxData(String dstAddr,
-                  long amount,
-                  int mixin,
-                  PendingTransaction.Priority priority,
-                  ArrayList<String> preferredInputs) {
-        this.dstAddr = dstAddr;
-        this.amount = amount;
-        this.mixin = mixin;
-        this.priority = priority;
-        this.preferredInputs = preferredInputs;
-    }
-
-    protected TxData(Parcel in) {
-        dstAddr = in.readString();
-        amount = in.readLong();
-        mixin = in.readInt();
-        priority = PendingTransaction.Priority.fromInteger(in.readInt());
-        in.readStringList(preferredInputs);
-    }
-
-    public String getDestinationAddress() {
-        return dstAddr;
-    }
-
-    public void setDestinationAddress(String dstAddr) {
-        this.dstAddr = dstAddr;
-    }
-
-    public long getAmount() {
-        return amount;
-    }
-
-    public void setAmount(long amount) {
-        this.amount = amount;
-    }
-
-    public void setAmount(double amount) {
-        this.amount = Wallet.getAmountFromDouble(amount);
-    }
-
-    public double getAmountAsDouble() {
-        return 1.0 * amount / Helper.ONE_XMR;
-    }
-
-    public ArrayList<String> getPreferredInputs() {
-        return preferredInputs;
-    }
-
-    public int getMixin() {
-        return mixin;
-    }
-
-    public void setMixin(int mixin) {
-        this.mixin = mixin;
-    }
-
-    public PendingTransaction.Priority getPriority() {
-        return priority;
-    }
-
-    public void setPriority(PendingTransaction.Priority priority) {
-        this.priority = priority;
-    }
-
-    public UserNotes getUserNotes() {
-        return userNotes;
-    }
-
-    public void setUserNotes(UserNotes userNotes) {
-        this.userNotes = userNotes;
-    }
-
-    @Override
-    public void writeToParcel(Parcel out, int flags) {
-        out.writeString(dstAddr);
-        out.writeLong(amount);
-        out.writeInt(mixin);
-        out.writeInt(priority.getValue());
-    }
-
-    @Override
-    public int describeContents() {
-        return 0;
-    }
-
-    @Override
-    public String toString() {
-        StringBuffer sb = new StringBuffer();
-        sb.append("dstAddr:");
-        sb.append(dstAddr);
-        sb.append(",amount:");
-        sb.append(amount);
-        sb.append(",mixin:");
-        sb.append(mixin);
-        sb.append(",priority:");
-        sb.append(priority);
-        return sb.toString();
-    }
-}

app/src/main/java/net/mynero/wallet/data/TxData.kt

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.data
+
+import android.os.Parcel
+import android.os.Parcelable
+import android.os.Parcelable.Creator
+import net.mynero.wallet.model.PendingTransaction
+import net.mynero.wallet.model.Wallet
+import net.mynero.wallet.util.Helper
+
+// https://stackoverflow.com/questions/2139134/how-to-send-an-object-from-one-android-activity-to-another-using-intents
+class TxData : Parcelable {
+    var destinationAddress: String? = null
+    var amount: Long = 0
+    var mixin = 0
+    var priority: PendingTransaction.Priority? = null
+    var userNotes: UserNotes? = null
+    var preferredInputs: ArrayList<String>? = null
+        private set
+
+    constructor()
+    constructor(txData: TxData) {
+        destinationAddress = txData.destinationAddress
+        amount = txData.amount
+        mixin = txData.mixin
+        priority = txData.priority
+        preferredInputs = txData.preferredInputs
+    }
+
+    constructor(dstAddr: String?,
+                amount: Long,
+                mixin: Int,
+                priority: PendingTransaction.Priority?,
+                preferredInputs: ArrayList<String>?) {
+        destinationAddress = dstAddr
+        this.amount = amount
+        this.mixin = mixin
+        this.priority = priority
+        this.preferredInputs = preferredInputs
+    }
+
+    protected constructor(`in`: Parcel) {
+        destinationAddress = `in`.readString()
+        amount = `in`.readLong()
+        mixin = `in`.readInt()
+        priority = PendingTransaction.Priority.fromInteger(`in`.readInt())
+        `in`.readStringList(preferredInputs!!)
+    }
+
+    fun setAmount(amount: Double) {
+        this.amount = Wallet.getAmountFromDouble(amount)
+    }
+
+    val amountAsDouble: Double
+        get() = 1.0 * amount / Helper.ONE_XMR
+
+    override fun writeToParcel(out: Parcel, flags: Int) {
+        out.writeString(destinationAddress)
+        out.writeLong(amount)
+        out.writeInt(mixin)
+        out.writeInt(priority!!.value)
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    override fun toString(): String {
+        val sb = StringBuffer()
+        sb.append("dstAddr:")
+        sb.append(destinationAddress)
+        sb.append(",amount:")
+        sb.append(amount)
+        sb.append(",mixin:")
+        sb.append(mixin)
+        sb.append(",priority:")
+        sb.append(priority)
+        return sb.toString()
+    }
+
+    companion object CREATOR : Creator<TxData> {
+        override fun createFromParcel(parcel: Parcel): TxData {
+            return TxData(parcel)
+        }
+
+        override fun newArray(size: Int): Array<TxData?> {
+            return arrayOfNulls(size)
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/data/UserNotes.java

@@ -1,80 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.data;
-
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-public class UserNotes {
-    public String txNotes = "";
-    public String note = "";
-    public String xmrtoTag = null;
-    public String xmrtoKey = null;
-    public String xmrtoAmount = null; // could be a double - but we are not doing any calculations
-    public String xmrtoCurrency = null;
-    public String xmrtoDestination = null;
-
-    public UserNotes(final String txNotes) {
-        if (txNotes == null) {
-            return;
-        }
-        this.txNotes = txNotes;
-        Pattern p = Pattern.compile("^\\{([a-z]+)-(\\w{6,}),([0-9.]*)([A-Z]+),(\\w*)\\} ?(.*)");
-        Matcher m = p.matcher(txNotes);
-        if (m.find()) {
-            xmrtoTag = m.group(1);
-            xmrtoKey = m.group(2);
-            xmrtoAmount = m.group(3);
-            xmrtoCurrency = m.group(4);
-            xmrtoDestination = m.group(5);
-            note = m.group(6);
-        } else {
-            note = txNotes;
-        }
-    }
-
-    public void setNote(String newNote) {
-        if (newNote != null) {
-            note = newNote;
-        } else {
-            note = "";
-        }
-        txNotes = buildTxNote();
-    }
-
-    private String buildTxNote() {
-        StringBuilder sb = new StringBuilder();
-        if (xmrtoKey != null) {
-            if ((xmrtoAmount == null) || (xmrtoDestination == null))
-                throw new IllegalArgumentException("Broken notes");
-            sb.append("{");
-            sb.append(xmrtoTag);
-            sb.append("-");
-            sb.append(xmrtoKey);
-            sb.append(",");
-            sb.append(xmrtoAmount);
-            sb.append(xmrtoCurrency);
-            sb.append(",");
-            sb.append(xmrtoDestination);
-            sb.append("}");
-            if ((note != null) && (!note.isEmpty()))
-                sb.append(" ");
-        }
-        sb.append(note);
-        return sb.toString();
-    }
-}

app/src/main/java/net/mynero/wallet/data/UserNotes.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.data
+
+import java.util.regex.Pattern
+
+class UserNotes(txNotes: String?) {
+    var txNotes: String? = ""
+    @JvmField
+    var note: String? = ""
+    @JvmField
+    var xmrtoTag: String? = null
+    @JvmField
+    var xmrtoKey: String? = null
+    @JvmField
+    var xmrtoAmount: String? = null // could be a double - but we are not doing any calculations
+    var xmrtoCurrency: String? = null
+    @JvmField
+    var xmrtoDestination: String? = null
+
+    init {
+        this.txNotes = txNotes
+        val p = Pattern.compile("^\\{([a-z]+)-(\\w{6,}),([0-9.]*)([A-Z]+),(\\w*)\\} ?(.*)")
+        val m = p.matcher(txNotes)
+        if (m.find()) {
+            xmrtoTag = m.group(1)
+            xmrtoKey = m.group(2)
+            xmrtoAmount = m.group(3)
+            xmrtoCurrency = m.group(4)
+            xmrtoDestination = m.group(5)
+            note = m.group(6)
+        } else {
+            note = txNotes
+        }
+    }
+
+    fun setNote(newNote: String?) {
+        note = newNote ?: ""
+        txNotes = buildTxNote()
+    }
+
+    private fun buildTxNote(): String {
+        val sb = StringBuilder()
+        if (xmrtoKey != null) {
+            require(!(xmrtoAmount == null || xmrtoDestination == null)) { "Broken notes" }
+            sb.append("{")
+            sb.append(xmrtoTag)
+            sb.append("-")
+            sb.append(xmrtoKey)
+            sb.append(",")
+            sb.append(xmrtoAmount)
+            sb.append(xmrtoCurrency)
+            sb.append(",")
+            sb.append(xmrtoDestination)
+            sb.append("}")
+            if (note != null && !note!!.isEmpty()) sb.append(" ")
+        }
+        sb.append(note)
+        return sb.toString()
+    }
+}

app/src/main/java/net/mynero/wallet/fragment/dialog/SendBottomSheetDialog.java

@@ -106,7 +106,7 @@ public class SendBottomSheetDialog extends BottomSheetDialogFragment {
         donateTextView = view.findViewById(R.id.donate_label_textview);
         donateTextView.setOnClickListener(view1 -> addressEditText.setText(Constants.DONATE_ADDRESS));
         if (uriData != null) {
-            addressEditText.setText(uriData.getAddress());
+            addressEditText.setText(uriData.address);
             if (uriData.hasAmount()) {
                 amountEditText.setText(uriData.getAmount());
             }
@@ -116,8 +116,8 @@ public class SendBottomSheetDialog extends BottomSheetDialogFragment {
             long selectedValue = 0;
 
             for (CoinsInfo coinsInfo : UTXOService.getInstance().getUtxos()) {
-                if (selectedUtxos.contains(coinsInfo.getKeyImage())) {
+                if (selectedUtxos.contains(coinsInfo.keyImage)) {
-                    selectedValue += coinsInfo.getAmount();
+                    selectedValue += coinsInfo.amount;
                 }
             }
 
@@ -338,7 +338,7 @@ public class SendBottomSheetDialog extends BottomSheetDialogFragment {
     private void pasteAddress(String address) {
         UriData uriData = UriData.parse(address);
         if (uriData != null) {
-            addressEditText.setText(uriData.getAddress());
+            addressEditText.setText(uriData.address);
             if (uriData.hasAmount()) {
                 amountEditText.setText(uriData.getAmount());
             }

app/src/main/java/net/mynero/wallet/fragment/onboarding/OnboardingViewModel.java

@@ -132,7 +132,7 @@ public class OnboardingViewModel extends ViewModel {
             } else {
                 mainActivity.runOnUiThread(() -> {
                     _enableCreateButton.postValue(true);
-                    Toast.makeText(mainActivity, application.getString(R.string.create_wallet_failed, walletStatus.getErrorString()), Toast.LENGTH_SHORT).show();
+                    Toast.makeText(mainActivity, application.getString(R.string.create_wallet_failed, walletStatus.errorString), Toast.LENGTH_SHORT).show();
                 });
             }
         });

app/src/main/java/net/mynero/wallet/fragment/receive/ReceiveFragment.java

@@ -91,7 +91,7 @@ public class ReceiveFragment extends Fragment {
 
     private void editAddressLabel(Subaddress subaddress) {
         EditAddressLabelBottomSheetDialog dialog = new EditAddressLabelBottomSheetDialog();
-        dialog.addressIndex = subaddress.getAddressIndex();
+        dialog.addressIndex = subaddress.addressIndex;
         dialog.listener = () -> mViewModel.init();
         dialog.show(getParentFragmentManager(), "edit_address_dialog");
     }
@@ -99,11 +99,11 @@ public class ReceiveFragment extends Fragment {
     private void setAddress(Subaddress subaddress) {
         final String label = subaddress.getDisplayLabel();
         final String address = getContext().getString(R.string.subbaddress_info_subtitle,
-                subaddress.getAddressIndex(), subaddress.getSquashedAddress());
+                subaddress.addressIndex, subaddress.getSquashedAddress());
         addressLabelTextView.setText(label.isEmpty() ? address : label);
-        addressTextView.setText(subaddress.getAddress());
+        addressTextView.setText(subaddress.address);
-        addressImageView.setImageBitmap(generate(subaddress.getAddress(), 256, 256));
+        addressImageView.setImageBitmap(generate(subaddress.address, 256, 256));
-        copyAddressImageButton.setOnClickListener(view1 -> Helper.clipBoardCopy(getContext(), "address", subaddress.getAddress()));
+        copyAddressImageButton.setOnClickListener(view1 -> Helper.clipBoardCopy(getContext(), "address", subaddress.address));
         addressLabelTextView.setOnLongClickListener(v -> {
             editAddressLabel(subaddress);
             return true;

app/src/main/java/net/mynero/wallet/fragment/send/SendFragment.java

@@ -411,7 +411,7 @@ public class SendFragment extends Fragment {
                 mViewModel.setShowAddOutputButton(false);
             }
             EditText addressField = entryView.findViewById(R.id.address_edittext);
-            addressField.setText(uriData.getAddress());
+            addressField.setText(uriData.address);
             if (uriData.hasAmount()) {
                 setAmount(entryView, uriData.getAmount());
             }

app/src/main/java/net/mynero/wallet/fragment/utxos/UtxosFragment.java

@@ -72,7 +72,7 @@ public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInf
         sendUtxosButton.setOnClickListener(view1 -> {
             ArrayList<String> selectedKeyImages = new ArrayList<>();
             for(CoinsInfo coinsInfo : adapter.getSelectedUtxos().values()) {
-                selectedKeyImages.add(coinsInfo.getKeyImage());
+                selectedKeyImages.add(coinsInfo.keyImage);
             }
             SendBottomSheetDialog sendDialog = new SendBottomSheetDialog();
             sendDialog.listener = this;
@@ -82,12 +82,12 @@ public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInf
         churnUtxosButton.setOnClickListener(view1 -> {
             ArrayList<String> selectedKeyImages = new ArrayList<>();
             for(CoinsInfo coinsInfo : adapter.getSelectedUtxos().values()) {
-                selectedKeyImages.add(coinsInfo.getKeyImage());
+                selectedKeyImages.add(coinsInfo.keyImage);
             }
             SendBottomSheetDialog sendDialog = new SendBottomSheetDialog();
             sendDialog.listener = this;
             sendDialog.isChurning = true;
-            sendDialog.uriData = UriData.parse(AddressService.getInstance().currentSubaddress().getAddress());
+            sendDialog.uriData = UriData.parse(AddressService.getInstance().currentSubaddress().address);
             sendDialog.selectedUtxos = selectedKeyImages;
             sendDialog.show(getActivity().getSupportFragmentManager(), null);
         });
@@ -103,7 +103,7 @@ public class UtxosFragment extends Fragment implements CoinsInfoAdapter.CoinsInf
                 HashMap<String, CoinsInfo> filteredUtxos = new HashMap<>();
                 for (CoinsInfo coinsInfo : utxos) {
                     if (!coinsInfo.isSpent()) {
-                        filteredUtxos.put(coinsInfo.getPubKey(), coinsInfo);
+                        filteredUtxos.put(coinsInfo.pubKey, coinsInfo);
                     }
                 }
                 if (filteredUtxos.isEmpty()) {

app/src/main/java/net/mynero/wallet/livedata/SingleLiveEvent.kt

@@ -13,65 +13,58 @@
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
+package net.mynero.wallet.livedata
 
-package net.mynero.wallet.livedata;
+import android.util.Log
-
+import androidx.annotation.MainThread
-import android.util.Log;
+import androidx.lifecycle.LifecycleOwner
-
+import androidx.lifecycle.MutableLiveData
-import androidx.annotation.MainThread;
+import androidx.lifecycle.Observer
-import androidx.annotation.Nullable;
+import java.util.concurrent.atomic.AtomicBoolean
-import androidx.lifecycle.LifecycleOwner;
-import androidx.lifecycle.MutableLiveData;
-import androidx.lifecycle.Observer;
-
-import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
  * A lifecycle-aware observable that sends only new updates after subscription, used for events like
  * navigation and Snackbar messages.
- * <p>
+ *
+ *
  * This avoids a common problem with events: on configuration change (like rotation) an update
  * can be emitted if the observer is active. This LiveData only calls the observable if there's an
  * explicit call to setValue() or call().
- * <p>
+ *
+ *
  * Note that only one observer is going to be notified of changes.
  */
-public class SingleLiveEvent<T> extends MutableLiveData<T> {
+class SingleLiveEvent<T> : MutableLiveData<T>() {
-
+    private val mPending = AtomicBoolean(false)
-    private static final String TAG = "SingleLiveEvent";
-
-    private final AtomicBoolean mPending = new AtomicBoolean(false);
-
     @MainThread
-    @Override
+    override fun observe(owner: LifecycleOwner, observer: Observer<in T>) {
-    public void observe(LifecycleOwner owner, final Observer<? super T> observer) {
-
         if (hasActiveObservers()) {
-            Log.w(TAG, "Multiple observers registered but only one will be notified of changes.");
+            Log.w(TAG, "Multiple observers registered but only one will be notified of changes.")
         }
 
         // Observe the internal MutableLiveData
-        super.observe(owner, new Observer<T>() {
+        super.observe(owner) { value ->
-            @Override
+            if (mPending.compareAndSet(true, false)) {
-            public void onChanged(@Nullable T t) {
+                observer.onChanged(value)
-                if (mPending.compareAndSet(true, false)) {
-                    observer.onChanged(t);
-                }
             }
-        });
+        }
     }
 
     @MainThread
-    public void setValue(@Nullable T t) {
+    override fun setValue(t: T?) {
-        mPending.set(true);
+        mPending.set(true)
-        super.setValue(t);
+        super.setValue(t)
     }
 
     /**
      * Used for cases where T is Void, to make calls cleaner.
      */
     @MainThread
-    public void call() {
+    fun call() {
-        setValue(null);
+        value = null
     }
-}
+
+    companion object {
+        private const val TAG = "SingleLiveEvent"
+    }
+}

app/src/main/java/net/mynero/wallet/model/BalanceInfo.java

@@ -1,48 +0,0 @@
-package net.mynero.wallet.model;
-
-import net.mynero.wallet.service.PrefService;
-import net.mynero.wallet.util.Constants;
-
-public class BalanceInfo {
-    private final long rawUnlocked;
-    private final long rawLocked;
-
-    public BalanceInfo(long rawUnlocked, long rawLocked) {
-        this.rawUnlocked = rawUnlocked;
-        this.rawLocked = rawLocked;
-    }
-
-    public long getRawLocked() {
-        return rawLocked;
-    }
-
-    public long getRawUnlocked() {
-        return rawUnlocked;
-    }
-
-    public boolean isUnlockedBalanceZero() {
-        return rawUnlocked == 0;
-    }
-
-    public boolean isLockedBalanceZero() {
-        return rawLocked == 0;
-    }
-
-    public String getUnlockedDisplay() {
-        boolean streetModeEnabled = PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false);
-        if(streetModeEnabled) {
-            return Constants.STREET_MODE_BALANCE;
-        } else {
-            return Wallet.getDisplayAmount(rawUnlocked);
-        }
-    }
-
-    public String getLockedDisplay() {
-        boolean streetModeEnabled = PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false);
-        if(streetModeEnabled) {
-            return Constants.STREET_MODE_BALANCE;
-        } else {
-            return Wallet.getDisplayAmount(rawLocked);
-        }
-    }
-}

app/src/main/java/net/mynero/wallet/model/BalanceInfo.kt

@@ -0,0 +1,32 @@
+package net.mynero.wallet.model
+
+import net.mynero.wallet.service.PrefService
+import net.mynero.wallet.util.Constants
+
+class BalanceInfo(val rawUnlocked: Long, val rawLocked: Long) {
+
+    val isUnlockedBalanceZero: Boolean
+        get() = rawUnlocked == 0L
+    val isLockedBalanceZero: Boolean
+        get() = rawLocked == 0L
+    val unlockedDisplay: String
+        get() {
+            val streetModeEnabled =
+                PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false)
+            return if (streetModeEnabled) {
+                Constants.STREET_MODE_BALANCE
+            } else {
+                Wallet.getDisplayAmount(rawUnlocked)
+            }
+        }
+    val lockedDisplay: String
+        get() {
+            val streetModeEnabled =
+                PrefService.getInstance().getBoolean(Constants.PREF_STREET_MODE, false)
+            return if (streetModeEnabled) {
+                Constants.STREET_MODE_BALANCE
+            } else {
+                Wallet.getDisplayAmount(rawLocked)
+            }
+        }
+}

app/src/main/java/net/mynero/wallet/model/Coins.java

@@ -1,52 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.model;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import timber.log.Timber;
-
-public class Coins {
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    private final long handle;
-
-    private List<CoinsInfo> coins = new ArrayList<>();
-
-    public Coins(long handle) {
-        this.handle = handle;
-    }
-
-    public native int getCount(); // over all accounts/subaddresses
-
-    public List<CoinsInfo> getAll() {
-        return coins;
-    }
-
-    public void refresh() {
-        List<CoinsInfo> transactionInfos = refreshJ();
-        Timber.d("refresh size=%d", transactionInfos.size());
-        coins = transactionInfos;
-    }
-
-    public native void setFrozen(String publicKey, boolean frozen);
-
-    private native List<CoinsInfo> refreshJ();
-}

app/src/main/java/net/mynero/wallet/model/Coins.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.model
+
+import timber.log.Timber
+
+class Coins(private val handle: Long) {
+    var all: List<CoinsInfo> = ArrayList()
+        private set
+
+    fun refresh() {
+        val transactionInfos = refreshJ()
+        Timber.d("refresh size=%d", transactionInfos.size)
+        all = transactionInfos
+    }
+
+    external fun setFrozen(publicKey: String?, frozen: Boolean)
+    private external fun refreshJ(): List<CoinsInfo>
+    external fun getCount(): Int
+
+    companion object {
+        init {
+            System.loadLibrary("monerujo")
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/model/CoinsInfo.java

@@ -1,131 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.model;
-
-import android.os.Parcel;
-import android.os.Parcelable;
-
-import androidx.annotation.NonNull;
-
-public class CoinsInfo implements Parcelable, Comparable<CoinsInfo> {
-    public static final Creator<CoinsInfo> CREATOR = new Creator<CoinsInfo>() {
-        @Override
-        public CoinsInfo createFromParcel(Parcel in) {
-            return new CoinsInfo(in);
-        }
-
-        @Override
-        public CoinsInfo[] newArray(int size) {
-            return new CoinsInfo[size];
-        }
-    };
-
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    long globalOutputIndex;
-    boolean spent;
-    String keyImage;
-    long amount;
-    String hash;
-    String pubKey;
-    boolean unlocked;
-    long localOutputIndex;
-    boolean frozen;
-    String address;
-
-    public CoinsInfo(long globalOutputIndex, boolean spent, String keyImage, long amount, String hash, String pubKey, boolean unlocked, long localOutputIndex, boolean frozen, String address) {
-        this.globalOutputIndex = globalOutputIndex;
-        this.spent = spent;
-        this.keyImage = keyImage;
-        this.amount = amount;
-        this.hash = hash;
-        this.pubKey = pubKey;
-        this.unlocked = unlocked;
-        this.localOutputIndex = localOutputIndex;
-        this.frozen = frozen;
-        this.address = address;
-    }
-
-    protected CoinsInfo(Parcel in) {
-        globalOutputIndex = in.readLong();
-    }
-
-    public long getGlobalOutputIndex() {
-        return globalOutputIndex;
-    }
-
-    public boolean isSpent() {
-        return spent;
-    }
-
-    public String getKeyImage() {
-        return keyImage;
-    }
-
-    public String getHash() {
-        return hash;
-    }
-
-    public long getAmount() {
-        return amount;
-    }
-
-    public String getPubKey() {
-        return pubKey;
-    }
-
-    public boolean isUnlocked() {
-        return unlocked;
-    }
-
-    public long getLocalOutputIndex() {
-        return localOutputIndex;
-    }
-
-    public boolean isFrozen() {
-        return frozen;
-    }
-
-    public String getAddress() {
-        return address;
-    }
-
-    @Override
-    public int describeContents() {
-        return 0;
-    }
-
-    @Override
-    public void writeToParcel(@NonNull Parcel parcel, int i) {
-        parcel.writeLong(globalOutputIndex);
-    }
-
-    @Override
-    public int compareTo(CoinsInfo another) {
-        long b1 = this.amount;
-        long b2 = another.amount;
-        if (b1 > b2) {
-            return -1;
-        } else if (b1 < b2) {
-            return 1;
-        } else {
-            return this.hash.compareTo(another.hash);
-        }
-    }
-}

app/src/main/java/net/mynero/wallet/model/CoinsInfo.kt

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.model
+
+import android.os.Parcel
+import android.os.Parcelable
+import android.os.Parcelable.Creator
+
+class CoinsInfo : Parcelable, Comparable<CoinsInfo> {
+    @JvmField
+    var globalOutputIndex: Long
+    var isSpent = false
+    @JvmField
+    var keyImage: String? = null
+    @JvmField
+    var amount: Long = 0
+    @JvmField
+    var hash: String? = null
+    @JvmField
+    var pubKey: String? = null
+    var isUnlocked = false
+    @JvmField
+    var localOutputIndex: Long = 0
+    var isFrozen = false
+    @JvmField
+    var address: String? = null
+
+    constructor(
+        globalOutputIndex: Long,
+        spent: Boolean,
+        keyImage: String?,
+        amount: Long,
+        hash: String?,
+        pubKey: String?,
+        unlocked: Boolean,
+        localOutputIndex: Long,
+        frozen: Boolean,
+        address: String?
+    ) {
+        this.globalOutputIndex = globalOutputIndex
+        isSpent = spent
+        this.keyImage = keyImage
+        this.amount = amount
+        this.hash = hash
+        this.pubKey = pubKey
+        isUnlocked = unlocked
+        this.localOutputIndex = localOutputIndex
+        isFrozen = frozen
+        this.address = address
+    }
+
+    protected constructor(`in`: Parcel) {
+        globalOutputIndex = `in`.readLong()
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    override fun writeToParcel(parcel: Parcel, i: Int) {
+        parcel.writeLong(globalOutputIndex)
+    }
+
+    override fun compareTo(another: CoinsInfo): Int {
+        val b1 = amount
+        val b2 = another.amount
+        return if (b1 > b2) {
+            -1
+        } else if (b1 < b2) {
+            1
+        } else {
+            hash!!.compareTo(another.hash!!)
+        }
+    }
+
+    companion object {
+        @JvmField
+        val CREATOR: Creator<CoinsInfo?> = object : Creator<CoinsInfo?> {
+            override fun createFromParcel(`in`: Parcel): CoinsInfo? {
+                return CoinsInfo(`in`)
+            }
+
+            override fun newArray(size: Int): Array<CoinsInfo?> {
+                return arrayOfNulls(size)
+            }
+        }
+
+        init {
+            System.loadLibrary("monerujo")
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/model/NetworkType.kt

@@ -13,33 +13,20 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.model
 
-package net.mynero.wallet.model;
+enum class NetworkType(@JvmField val value: Int) {
+    NetworkType_Mainnet(0), NetworkType_Testnet(1), NetworkType_Stagenet(2);
 
-public enum NetworkType {
+    companion object {
-    NetworkType_Mainnet(0),
+        @JvmStatic
-    NetworkType_Testnet(1),
+        fun fromInteger(n: Int): NetworkType? {
-    NetworkType_Stagenet(2);
+            when (n) {
-
+                0 -> return NetworkType_Mainnet
-    private final int value;
+                1 -> return NetworkType_Testnet
-
+                2 -> return NetworkType_Stagenet
-    NetworkType(int value) {
+            }
-        this.value = value;
+            return null
-    }
-
-    public static NetworkType fromInteger(int n) {
-        switch (n) {
-            case 0:
-                return NetworkType_Mainnet;
-            case 1:
-                return NetworkType_Testnet;
-            case 2:
-                return NetworkType_Stagenet;
         }
-        return null;
     }
-
+}
-    public int getValue() {
-        return value;
-    }
-}

app/src/main/java/net/mynero/wallet/model/PendingTransaction.java

@@ -1,98 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.model;
-
-public class PendingTransaction {
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    public long handle;
-
-    PendingTransaction(long handle) {
-        this.handle = handle;
-    }
-
-    public Status getStatus() {
-        return Status.values()[getStatusJ()];
-    }
-
-    public native int getStatusJ();
-
-    public native String getErrorString();
-
-    // commit transaction or save to file if filename is provided.
-    public native boolean commit(String filename, boolean overwrite);
-
-    public native long getAmount();
-
-    public native long getDust();
-
-    public native long getFee();
-
-    public String getFirstTxId() {
-        String id = getFirstTxIdJ();
-        if (id == null)
-            throw new IndexOutOfBoundsException();
-        return id;
-    }
-
-    public native String getFirstTxIdJ();
-
-    public native long getTxCount();
-
-    public enum Status {
-        Status_Ok,
-        Status_Error,
-        Status_Critical
-    }
-
-    public enum Priority {
-        Priority_Default(0),
-        Priority_Low(1),
-        Priority_Medium(2),
-        Priority_High(3),
-        Priority_Last(4);
-
-        private final int value;
-
-        Priority(int value) {
-            this.value = value;
-        }
-
-        public static Priority fromInteger(int n) {
-            switch (n) {
-                case 0:
-                    return Priority_Default;
-                case 1:
-                    return Priority_Low;
-                case 2:
-                    return Priority_Medium;
-                case 3:
-                    return Priority_High;
-            }
-            return null;
-        }
-
-        public int getValue() {
-            return value;
-        }
-
-
-    }
-
-}

app/src/main/java/net/mynero/wallet/model/PendingTransaction.kt

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.model
+
+class PendingTransaction internal constructor(var handle: Long) {
+    val status: Status
+        get() = Status.values()[getStatusJ()]
+    external fun getStatusJ(): Int
+    external fun getErrorString(): String?
+
+    // commit transaction or save to file if filename is provided.
+    external fun commit(filename: String?, overwrite: Boolean): Boolean
+
+    external fun getAmount(): Long
+    external fun getDust(): Long
+    external fun getFee(): Long
+    val firstTxId: String
+        get() = getFirstTxIdJ() ?: throw IndexOutOfBoundsException()
+    external fun getFirstTxIdJ(): String?
+    external fun getTxCount(): Long
+
+    enum class Status {
+        Status_Ok, Status_Error, Status_Critical
+    }
+
+    enum class Priority(@JvmField val value: Int) {
+        Priority_Default(0), Priority_Low(1), Priority_Medium(2), Priority_High(3), Priority_Last(4);
+
+        companion object {
+            fun fromInteger(n: Int): Priority? {
+                when (n) {
+                    0 -> return Priority_Default
+                    1 -> return Priority_Low
+                    2 -> return Priority_Medium
+                    3 -> return Priority_High
+                }
+                return null
+            }
+        }
+    }
+
+    companion object {
+        init {
+            System.loadLibrary("monerujo")
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/model/TransactionHistory.kt

@@ -13,69 +13,52 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.model
 
-package net.mynero.wallet.model;
+import timber.log.Timber
 
-import java.util.ArrayList;
+class TransactionHistory(private val handle: Long, var accountIndex: Int) {
-import java.util.Iterator;
+    var all: List<TransactionInfo> = ArrayList()
-import java.util.List;
+        private set
 
-import timber.log.Timber;
+    fun setAccountFor(wallet: Wallet) {
-
-public class TransactionHistory {
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    private final long handle;
-
-    int accountIndex;
-    private List<TransactionInfo> transactions = new ArrayList<>();
-
-    public TransactionHistory(long handle, int accountIndex) {
-        this.handle = handle;
-        this.accountIndex = accountIndex;
-    }
-
-    public void setAccountFor(Wallet wallet) {
         if (accountIndex != wallet.getAccountIndex()) {
-            this.accountIndex = wallet.getAccountIndex();
+            accountIndex = wallet.getAccountIndex()
-            refreshWithNotes(wallet);
+            refreshWithNotes(wallet)
         }
     }
 
-    private void loadNotes(Wallet wallet) {
+    private fun loadNotes(wallet: Wallet) {
-        for (TransactionInfo info : transactions) {
+        for (info in all) {
-            info.notes = wallet.getUserNote(info.hash);
+            info.notes = wallet.getUserNote(info.hash)
         }
     }
 
-    //private native long getTransactionByIndexJ(int i);
+    external fun getCount(): Int
 
-    //private native long getTransactionByIdJ(String id);
+    fun refreshWithNotes(wallet: Wallet) {
-
+        refresh()
-    public native int getCount(); // over all accounts/subaddresses
+        loadNotes(wallet)
-
-    public List<TransactionInfo> getAll() {
-        return transactions;
     }
 
-    void refreshWithNotes(Wallet wallet) {
+    private fun refresh() {
-        refresh();
+        val transactionInfos = refreshJ()
-        loadNotes(wallet);
+        Timber.d("refresh size=%d", transactionInfos.size)
-    }
+        val iterator = transactionInfos.iterator()
-
+        while (iterator.hasNext()) {
-    private void refresh() {
+            val info = iterator.next()
-        List<TransactionInfo> transactionInfos = refreshJ();
-        Timber.d("refresh size=%d", transactionInfos.size());
-        for (Iterator<TransactionInfo> iterator = transactionInfos.iterator(); iterator.hasNext(); ) {
-            TransactionInfo info = iterator.next();
             if (info.accountIndex != accountIndex) {
-                iterator.remove();
+                iterator.remove()
             }
         }
-        transactions = transactionInfos;
+        all = transactionInfos
     }
 
-    private native List<TransactionInfo> refreshJ();
+    private external fun refreshJ(): MutableList<TransactionInfo>
-}
+
+    companion object {
+        init {
+            System.loadLibrary("monerujo")
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/model/TransactionOutput.java

@@ -1,22 +0,0 @@
-package net.mynero.wallet.model;
-
-import net.mynero.wallet.service.PrefService;
-import net.mynero.wallet.util.Constants;
-
-public class TransactionOutput {
-    private final String destination;
-    private final long amount;
-
-    public TransactionOutput(String destination, long amount) {
-        this.destination = destination;
-        this.amount = amount;
-    }
-
-    public String getDestination() {
-        return destination;
-    }
-
-    public long getAmount() {
-        return amount;
-    }
-}

app/src/main/java/net/mynero/wallet/model/TransactionOutput.kt

@@ -0,0 +1,3 @@
+package net.mynero.wallet.model
+
+class TransactionOutput(@JvmField val destination: String, @JvmField val amount: Long)

app/src/main/java/net/mynero/wallet/model/Transfer.java

@@ -1,56 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.model;
-
-import android.os.Parcel;
-import android.os.Parcelable;
-
-public class Transfer implements Parcelable {
-    public static final Parcelable.Creator<Transfer> CREATOR = new Parcelable.Creator<Transfer>() {
-        public Transfer createFromParcel(Parcel in) {
-            return new Transfer(in);
-        }
-
-        public Transfer[] newArray(int size) {
-            return new Transfer[size];
-        }
-    };
-    public long amount;
-    public String address;
-
-    public Transfer(long amount, String address) {
-        this.amount = amount;
-        this.address = address;
-    }
-
-    private Transfer(Parcel in) {
-        amount = in.readLong();
-        address = in.readString();
-    }
-
-    @Override
-    public void writeToParcel(Parcel out, int flags) {
-        out.writeLong(amount);
-        out.writeString(address);
-    }
-
-    @Override
-    public int describeContents() {
-        return 0;
-    }
-
-}

app/src/main/java/net/mynero/wallet/model/Transfer.kt

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.model
+
+import android.os.Parcel
+import android.os.Parcelable
+import android.os.Parcelable.Creator
+
+class Transfer : Parcelable {
+    var amount: Long
+    @JvmField
+    var address: String?
+
+    constructor(amount: Long, address: String?) {
+        this.amount = amount
+        this.address = address
+    }
+
+    private constructor(`in`: Parcel) {
+        amount = `in`.readLong()
+        address = `in`.readString()
+    }
+
+    override fun writeToParcel(out: Parcel, flags: Int) {
+        out.writeLong(amount)
+        out.writeString(address)
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    companion object CREATOR : Creator<Transfer> {
+        override fun createFromParcel(parcel: Parcel): Transfer {
+            return Transfer(parcel)
+        }
+
+        override fun newArray(size: Int): Array<Transfer?> {
+            return arrayOfNulls(size)
+        }
+    }
+}

app/src/main/java/net/mynero/wallet/model/Wallet.kt

@@ -13,566 +13,464 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.model
 
-package net.mynero.wallet.model;
+import android.util.Pair
+import net.mynero.wallet.data.Subaddress
+import net.mynero.wallet.model.NetworkType.Companion.fromInteger
+import net.mynero.wallet.model.WalletManager.Companion.instance
+import timber.log.Timber
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
 
-import android.util.Log;
+class Wallet {
-import android.util.Pair;
+    var isSynchronized = false
+    private var accountIndex = 0
+    private var handle: Long = 0
+    private var listenerHandle: Long = 0
+    private var pendingTransaction: PendingTransaction? = null
+    var history: TransactionHistory? = null
+        get() {
+            if (field == null) {
+                field = TransactionHistory(getHistoryJ(), accountIndex)
+            }
+            return field
+        }
+        private set
+    var coins: Coins? = null
+        get() {
+            if (field == null) {
+                field = Coins(getCoinsJ())
+            }
+            return field
+        }
+        private set
 
-import androidx.annotation.NonNull;
+    internal constructor(handle: Long) {
-import androidx.annotation.Nullable;
+        this.handle = handle
-
-import net.mynero.wallet.data.Subaddress;
-import net.mynero.wallet.data.TxData;
-
-import java.io.File;
-import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.List;
-import java.util.Locale;
-
-import timber.log.Timber;
-
-public class Wallet {
-    final static public long SWEEP_ALL = Long.MAX_VALUE;
-    private static final String NEW_ACCOUNT_NAME = "Untitled account"; // src/wallet/wallet2.cpp:941
-
-    static {
-        System.loadLibrary("monerujo");
     }
 
-    boolean synced = false;
+    internal constructor(handle: Long, accountIndex: Int) {
-    private int accountIndex = 0;
+        this.handle = handle
-    private long handle = 0;
+        this.accountIndex = accountIndex
-    private long listenerHandle = 0;
-    private PendingTransaction pendingTransaction = null;
-    private TransactionHistory history = null;
-    private Coins coins = null;
-
-    Wallet(long handle) {
-        this.handle = handle;
     }
 
-    Wallet(long handle, int accountIndex) {
+    fun getAccountIndex(): Int {
-        this.handle = handle;
+        return accountIndex
-        this.accountIndex = accountIndex;
     }
 
-    public static native String getDisplayAmount(long amount);
+    fun setAccountIndex(accountIndex: Int) {
-
+        Timber.d("setAccountIndex(%d)", accountIndex)
-    public static native long getAmountFromString(String amount);
+        this.accountIndex = accountIndex
-
+        history?.setAccountFor(this)
-    public static native long getAmountFromDouble(double amount);
-
-    public static native String generatePaymentId();
-
-    public static native boolean isPaymentIdValid(String payment_id);
-
-    public static boolean isAddressValid(String address) {
-        return isAddressValid(address, WalletManager.getInstance().getNetworkType().getValue());
     }
 
-    public static native boolean isAddressValid(String address, int networkType);
+    val name: String
+        get() = getPath()?.let { File(it).name }.toString()
 
-    public static native String getPaymentIdFromAddress(String address, int networkType);
+    external fun getSeed(offset: String?): String?
+    external fun getLegacySeed(offset: String?): String?
+    external fun isPolyseedSupported(offset: String?): Boolean
+    external fun getSeedLanguage(): String?
 
-    public static native long getMaximumAllowedAmount();
+    val status: Status
+        get() = statusWithErrorString()
+    val fullStatus: Status
+        get() {
+            val walletStatus = statusWithErrorString()
+            walletStatus.connectionStatus = connectionStatus
+            return walletStatus
+        }
 
-    public int getAccountIndex() {
+    private external fun statusWithErrorString(): Status
-        return accountIndex;
+    @Synchronized
+    external fun setPassword(password: String?): Boolean
+    val address: String
+        get() = getAddress(accountIndex)
+
+    //TODO virtual void hardForkInfo(uint8_t &version, uint64_t &earliest_height) const = 0;
+    //TODO virtual bool useForkRules(uint8_t version, int64_t early_blocks) const = 0;
+    fun getAddress(accountIndex: Int): String {
+        return getAddressJ(accountIndex, 0)
     }
 
-    public void setAccountIndex(int accountIndex) {
+    private fun getSubaddress(addressIndex: Int): String {
-        Timber.d("setAccountIndex(%d)", accountIndex);
+        return getAddressJ(accountIndex, addressIndex)
-        this.accountIndex = accountIndex;
-        getHistory().setAccountFor(this);
     }
 
-    public String getName() {
+    fun getSubaddress(accountIndex: Int, addressIndex: Int): String {
-        return new File(getPath()).getName();
+        return getAddressJ(accountIndex, addressIndex)
     }
 
-    public native String getSeed(String offset);
+    private external fun getAddressJ(accountIndex: Int, addressIndex: Int): String
-
+    private fun getSubaddressObject(accountIndex: Int, subAddressIndex: Int): Subaddress {
-    public native String getLegacySeed(String offset);
+        return Subaddress(
-
+            accountIndex, subAddressIndex,
-    public native boolean isPolyseedSupported(String offset);
+            getSubaddress(subAddressIndex), getSubaddressLabel(subAddressIndex)
-
+        )
-    public native String getSeedLanguage();
-
-    public native void setSeedLanguage(String language);
-
-    public Status getStatus() {
-        return statusWithErrorString();
     }
 
-    public Status getFullStatus() {
+    fun getSubaddressObject(subAddressIndex: Int): Subaddress {
-        Wallet.Status walletStatus = statusWithErrorString();
+        val subaddress = getSubaddressObject(accountIndex, subAddressIndex)
-        walletStatus.setConnectionStatus(getConnectionStatus());
+        var amount: Long = 0
-        return walletStatus;
+        history?.let { history ->
-    }
+            for (info in history.all) {
-
+                if (info.addressIndex == subAddressIndex && info.direction == TransactionInfo.Direction.Direction_In) {
-    private native Status statusWithErrorString();
+                    amount += info.amount
-
+                }
-    public native synchronized boolean setPassword(String password);
-
-    public String getAddress() {
-        return getAddress(accountIndex);
-    }
-
-//TODO virtual void hardForkInfo(uint8_t &version, uint64_t &earliest_height) const = 0;
-//TODO virtual bool useForkRules(uint8_t version, int64_t early_blocks) const = 0;
-
-    public String getAddress(int accountIndex) {
-        return getAddressJ(accountIndex, 0);
-    }
-
-    public String getSubaddress(int addressIndex) {
-        return getAddressJ(accountIndex, addressIndex);
-    }
-
-    public String getSubaddress(int accountIndex, int addressIndex) {
-        return getAddressJ(accountIndex, addressIndex);
-    }
-
-    private native String getAddressJ(int accountIndex, int addressIndex);
-
-    public Subaddress getSubaddressObject(int accountIndex, int subAddressIndex) {
-        return new Subaddress(accountIndex, subAddressIndex,
-                getSubaddress(subAddressIndex), getSubaddressLabel(subAddressIndex));
-    }
-
-    public Subaddress getSubaddressObject(int subAddressIndex) {
-        Subaddress subaddress = getSubaddressObject(accountIndex, subAddressIndex);
-        long amount = 0;
-        for (TransactionInfo info : getHistory().getAll()) {
-            if ((info.addressIndex == subAddressIndex)
-                    && (info.direction == TransactionInfo.Direction.Direction_In)) {
-                amount += info.amount;
             }
         }
-        subaddress.setAmount(amount);
+
-        return subaddress;
+        subaddress.amount = amount
+        return subaddress
+    }
+    external fun getPath(): String?
+    val networkType: NetworkType?
+        get() = fromInteger(nettype())
+
+    external fun nettype(): Int
+
+    //    virtual bool createWatchOnly(const std::string &path, const std::string &password, const std::string &language) const = 0;
+    //    virtual void setRefreshFromBlockHeight(uint64_t refresh_from_block_height) = 0;
+    external fun getIntegratedAddress(paymentId: String?): String?
+    external fun getSecretViewKey(): String
+    external fun getSecretSpendKey(): String
+
+    fun store(): Boolean {
+        return store("")
     }
 
-    public native String getPath();
+    //TODO virtual void setTrustedDaemon(bool arg) = 0;
-
+    //TODO virtual bool trustedDaemon() const = 0;
-    public NetworkType getNetworkType() {
+    @Synchronized
-        return NetworkType.fromInteger(nettype());
+    external fun store(path: String?): Boolean
+    fun close(): Boolean {
+        disposePendingTransaction()
+        return instance?.close(this) == true
     }
 
-    public native int nettype();
+    external fun getFilename(): String
-
-//    virtual bool createWatchOnly(const std::string &path, const std::string &password, const std::string &language) const = 0;
-//    virtual void setRefreshFromBlockHeight(uint64_t refresh_from_block_height) = 0;
-
-    public native String getIntegratedAddress(String payment_id);
-
-    public native String getSecretViewKey();
-
-    //    virtual void setRecoveringFromSeed(bool recoveringFromSeed) = 0;
-//    virtual bool connectToDaemon() = 0;
-
-    public native String getSecretSpendKey();
-
-    public boolean store() {
-        return store("");
-    }
-
-//TODO virtual void setTrustedDaemon(bool arg) = 0;
-//TODO virtual bool trustedDaemon() const = 0;
-
-    public native synchronized boolean store(String path);
-
-    public boolean close() {
-        disposePendingTransaction();
-        return WalletManager.getInstance().close(this);
-    }
-
-    public native String getFilename();
 
     //    virtual std::string keysFilename() const = 0;
-    public boolean init(long upper_transaction_size_limit) {
+    fun init(upperTransactionSizeLimit: Long): Boolean {
-        String daemon_address = WalletManager.getInstance().getDaemonAddress();
+        var daemonAddress = instance?.getDaemonAddress()
-        String daemon_username = WalletManager.getInstance().getDaemonUsername();
+        var daemonUsername = instance?.daemonUsername
-        String daemon_password = WalletManager.getInstance().getDaemonPassword();
+        var daemonPassword = instance?.daemonPassword
-        String proxy_address = WalletManager.getInstance().getProxy();
+        var proxyAddress = instance?.proxy
-        Log.d("Wallet.java", "init(");
+        Timber.d("init(")
-        if (daemon_address != null) {
+        if (daemonAddress != null) {
-            Log.d("Wallet.java", daemon_address.toString());
+            Timber.d(daemonAddress.toString())
         } else {
-            Log.d("Wallet.java", "daemon_address == null");
+            Timber.d("daemon_address == null")
-            daemon_address = "";
+            daemonAddress = ""
         }
-        Log.d("Wallet.java", "upper_transaction_size_limit = 0 (probably)");
+        Timber.d("upper_transaction_size_limit = 0 (probably)")
-        if (daemon_username != null) {
+        if (daemonUsername != null) {
-            Log.d("Wallet.java", daemon_username.toString());
+            Timber.d(daemonUsername)
         } else {
-            Log.d("Wallet.java", "daemon_username == null");
+            Timber.d("daemon_username == null")
-            daemon_username = "";
+            daemonUsername = ""
         }
-        if (daemon_password != null) {
+        if (daemonPassword != null) {
-            Log.d("Wallet.java", daemon_password.toString());
+            Timber.d(daemonPassword)
         } else {
-            Log.d("Wallet.java", "daemon_password == null");
+            Timber.d("daemon_password == null")
-            daemon_password = "";
+            daemonPassword = ""
         }
-        if (proxy_address != null) {
+        if (proxyAddress != null) {
-            Log.d("Wallet.java", proxy_address.toString());
+            Timber.d(proxyAddress)
         } else {
-            Log.d("Wallet.java", "proxy_address == null");
+            Timber.d("proxy_address == null")
-            proxy_address = "";
+            proxyAddress = ""
         }
-        Log.d("Wallet.java", ");");
+        Timber.d(");")
-        return initJ(daemon_address, upper_transaction_size_limit,
+        return initJ(
-                daemon_username, daemon_password,
+            daemonAddress, upperTransactionSizeLimit,
-                proxy_address);
+            daemonUsername, daemonPassword,
+            proxyAddress
+        )
     }
 
+    private external fun initJ(
+        daemonAddress: String, upperTransactionSizeLimit: Long,
+        daemonUsername: String, daemonPassword: String, proxyAddress: String
+    ): Boolean
 
-    private native boolean initJ(String daemon_address, long upper_transaction_size_limit,
+    external fun getRestoreHeight(): Long
-                                 String daemon_username, String daemon_password, String proxy);
+    external fun setRestoreHeight(height: Long)
 
-    public native long getRestoreHeight();
+    private val connectionStatus: ConnectionStatus
+        get() {
+            val s = getConnectionStatusJ()
+            return ConnectionStatus.values()[s]
+        }
 
-    public native void setRestoreHeight(long height);
+    private external fun getConnectionStatusJ(): Int
 
-    public ConnectionStatus getConnectionStatus() {
+    external fun setProxy(address: String?): Boolean
-        int s = getConnectionStatusJ();
+    val balance: Long
-        return Wallet.ConnectionStatus.values()[s];
+        get() = getBalance(accountIndex)
+
+    private external fun getBalance(accountIndex: Int): Long
+    external fun getBalanceAll(): Long
+    val unlockedBalance: Long
+        get() = getUnlockedBalance(accountIndex)
+    external fun getUnlockedBalanceAll(): Long
+
+    external fun getUnlockedBalance(accountIndex: Int): Long
+    external fun isWatchOnly(): Boolean
+    external fun getBlockChainHeight(): Long
+    external fun getApproximateBlockChainHeight(): Long
+    external fun getDaemonBlockChainHeight(): Long
+    external fun getDaemonBlockChainTargetHeight(): Long
+
+    fun setSynchronized() {
+        isSynchronized = true
     }
 
-    private native int getConnectionStatusJ();
+    external fun startRefresh()
-
+    external fun pauseRefresh()
-    public native boolean setProxy(String address);
+    external fun refresh(): Boolean
-
+    external fun refreshAsync()
-    public long getBalance() {
+    private external fun rescanBlockchainAsyncJ()
-        return getBalance(accountIndex);
+    fun rescanBlockchainAsync() {
+        isSynchronized = false
+        rescanBlockchainAsyncJ()
     }
 
-    public native long getBalance(int accountIndex);
+    //TODO virtual void setAutoRefreshInterval(int millis) = 0;
-
+    //TODO virtual int autoRefreshInterval() const = 0;
-    public native long getBalanceAll();
+    private fun disposePendingTransaction() {
-
-    public long getUnlockedBalance() {
-        return getUnlockedBalance(accountIndex);
-    }
-
-    public native long getUnlockedBalanceAll();
-
-    public native long getUnlockedBalance(int accountIndex);
-
-    public native boolean isWatchOnly();
-
-    public native long getBlockChainHeight();
-
-    public native long getApproximateBlockChainHeight();
-
-    public native long getDaemonBlockChainHeight();
-
-    public native long getDaemonBlockChainTargetHeight();
-
-    public boolean isSynchronized() {
-        return synced;
-    }
-
-    public void setSynchronized() {
-        this.synced = true;
-    }
-
-    public native void startRefresh();
-
-    public native void pauseRefresh();
-
-    public native boolean refresh();
-
-    public native void refreshAsync();
-
-    public native void rescanBlockchainAsyncJ();
-
-    public void rescanBlockchainAsync() {
-        synced = false;
-        rescanBlockchainAsyncJ();
-    }
-
-    public PendingTransaction getPendingTransaction() {
-        return pendingTransaction;
-    }
-
-//TODO virtual void setAutoRefreshInterval(int millis) = 0;
-//TODO virtual int autoRefreshInterval() const = 0;
-
-    public void disposePendingTransaction() {
         if (pendingTransaction != null) {
-            disposeTransaction(pendingTransaction);
+            disposeTransaction(pendingTransaction)
-            pendingTransaction = null;
+            pendingTransaction = null
         }
     }
 
-    public long estimateTransactionFee(List<Pair<String, Long>> destinations, PendingTransaction.Priority priority) {
+    fun estimateTransactionFee(
-        int _priority = priority.getValue();
+        destinations: List<Pair<String, Long>>,
-        return estimateTransactionFee(destinations, _priority);
+        priority: PendingTransaction.Priority
+    ): Long {
+        val _priority = priority.value
+        return estimateTransactionFee(destinations, _priority)
     }
 
-    private native long estimateTransactionFee(List<Pair<String, Long>> destinations, int priority);
+    private external fun estimateTransactionFee(
+        destinations: List<Pair<String, Long>>,
+        priority: Int
+    ): Long
 
-    public PendingTransaction createSweepTransaction(String dst_addr, PendingTransaction.Priority priority, ArrayList<String> key_images) {
+    fun createSweepTransaction(
-        disposePendingTransaction();
+        dstAddr: String,
-        int _priority = priority.getValue();
+        priority: PendingTransaction.Priority,
-        long txHandle = createSweepTransaction(dst_addr, "", 0, _priority, accountIndex, key_images);
+        keyImages: ArrayList<String>
-        pendingTransaction = new PendingTransaction(txHandle);
+    ): PendingTransaction? {
-        return pendingTransaction;
+        disposePendingTransaction()
+        val _priority = priority.value
+        val txHandle = createSweepTransaction(dstAddr, "", 0, _priority, accountIndex, keyImages)
+        pendingTransaction = PendingTransaction(txHandle)
+        return pendingTransaction
     }
 
-    public PendingTransaction createTransactionMultDest(List<TransactionOutput> outputs, PendingTransaction.Priority priority, ArrayList<String> key_images) {
+    fun createTransactionMultDest(
-        disposePendingTransaction();
+        outputs: List<TransactionOutput>,
-        int _priority = priority.getValue();
+        priority: PendingTransaction.Priority,
-        ArrayList<String> destinations = new ArrayList<>();
+        keyImages: ArrayList<String>
-        long[] amounts = new long[outputs.size()];
+    ): PendingTransaction? {
-        for(int i = 0; i < outputs.size(); i++) {
+        disposePendingTransaction()
-            TransactionOutput output = outputs.get(i);
+        val _priority = priority.value
-            destinations.add(output.getDestination());
+        val destinations = ArrayList<String>()
-            amounts[i] = output.getAmount();
+        val amounts = LongArray(outputs.size)
+        for (i in outputs.indices) {
+            val output = outputs[i]
+            destinations.add(output.destination)
+            amounts[i] = output.amount
         }
-        long txHandle = createTransactionMultDestJ(destinations, "", amounts, 0, _priority,
+        val txHandle = createTransactionMultDestJ(
-                        accountIndex, key_images);
+            destinations, "", amounts, 0, _priority,
-        pendingTransaction = new PendingTransaction(txHandle);
+            accountIndex, keyImages
-        return pendingTransaction;
+        )
+        pendingTransaction = PendingTransaction(txHandle)
+        return pendingTransaction
     }
 
-    private native long createTransactionMultDestJ(ArrayList<String> dst_addrs, String payment_id,
+    private external fun createTransactionMultDestJ(
-                                           long[] amount, int mixin_count,
+        dstAddrs: ArrayList<String>, paymentId: String,
-                                           int priority, int accountIndex, ArrayList<String> key_images);
+        amount: LongArray, mixinCount: Int,
+        priority: Int, accountIndex: Int, keyImages: ArrayList<String>
+    ): Long
 
-    private native long createTransactionJ(String dst_addr, String payment_id,
+    private external fun createTransactionJ(
-                                           long amount, int mixin_count,
+        dstAddr: String, paymentId: String,
-                                           int priority, int accountIndex, ArrayList<String> key_images);
+        amount: Long, mixinCount: Int,
+        priority: Int, accountIndex: Int, keyImages: ArrayList<String>
+    ): Long
 
-    private native long createSweepTransaction(String dst_addr, String payment_id,
+    private external fun createSweepTransaction(
-                                               int mixin_count,
+        dstAddr: String, paymentId: String,
-                                               int priority, int accountIndex, ArrayList<String> key_images);
+        mixinCount: Int,
+        priority: Int, accountIndex: Int, keyImages: ArrayList<String>
+    ): Long
 
-    public PendingTransaction createSweepUnmixableTransaction() {
+    fun createSweepUnmixableTransaction(): PendingTransaction? {
-        disposePendingTransaction();
+        disposePendingTransaction()
-        long txHandle = createSweepUnmixableTransactionJ();
+        val txHandle = createSweepUnmixableTransactionJ()
-        pendingTransaction = new PendingTransaction(txHandle);
+        pendingTransaction = PendingTransaction(txHandle)
-        return pendingTransaction;
+        return pendingTransaction
     }
 
-    private native long createSweepUnmixableTransactionJ();
+    private external fun createSweepUnmixableTransactionJ(): Long
+    private external fun disposeTransaction(pendingTransaction: PendingTransaction?)
+    private external fun getHistoryJ(): Long
+    private external fun getCoinsJ(): Long
 
-    public native void disposeTransaction(PendingTransaction pendingTransaction);
+    //virtual bool exportKeyImages(const std::string &filename) = 0;
-
+    //virtual bool importKeyImages(const std::string &filename) = 0;
-    public TransactionHistory getHistory() {
+    //virtual TransactionHistory * history() const = 0;
-        if (history == null) {
+    fun refreshHistory() {
-            history = new TransactionHistory(getHistoryJ(), accountIndex);
+        history?.refreshWithNotes(this)
-        }
-        return history;
     }
 
-//virtual UnsignedTransaction * loadUnsignedTx(const std::string &unsigned_filename) = 0;
+    fun refreshCoins() {
-//virtual bool submitTransaction(const std::string &fileName) = 0;
+        if (isSynchronized) {
-
+            coins?.refresh()
-    private native long getHistoryJ();
-
-    public Coins getCoins() {
-        if (coins == null) {
-            coins = new Coins(getCoinsJ());
-        }
-        return coins;
-    }
-
-    private native long getCoinsJ();
-
-//virtual bool exportKeyImages(const std::string &filename) = 0;
-//virtual bool importKeyImages(const std::string &filename) = 0;
-
-
-//virtual TransactionHistory * history() const = 0;
-
-    public void refreshHistory() {
-        getHistory().refreshWithNotes(this);
-    }
-
-    public void refreshCoins() {
-        if (this.isSynchronized()) {
-            getCoins().refresh();
         }
     }
 
-    private native long setListenerJ(WalletListener listener);
+    private external fun setListenerJ(listener: WalletListener): Long
-
+    fun setListener(listener: WalletListener) {
-    public void setListener(WalletListener listener) {
+        listenerHandle = setListenerJ(listener)
-        this.listenerHandle = setListenerJ(listener);
     }
 
-    public native int getDefaultMixin();
+    external fun getDefaultMixin(): Int
+    external fun setDefaultMixin(mixin: Int)
+    external fun setUserNote(txid: String?, note: String?): Boolean
+    external fun getUserNote(txid: String?): String?
+    external fun getTxKey(txid: String?): String?
+    @JvmOverloads
+    external fun addAccount(label: String? = NEW_ACCOUNT_NAME)
+    var accountLabel: String?
+        get() = getAccountLabel(accountIndex)
+        //virtual std::string signMessage(const std::string &message) = 0;
+        set(label) {
+            setAccountLabel(accountIndex, label)
+        }
 
-//virtual AddressBook * addressBook() const = 0;
+    private fun getAccountLabel(accountIndex: Int): String {
-//virtual void setListener(WalletListener *) = 0;
+        var label = getSubaddressLabel(accountIndex, 0)
-
+        if (label == NEW_ACCOUNT_NAME) {
-    public native void setDefaultMixin(int mixin);
+            val address = getAddress(accountIndex)
-
+            val len = address.length
-    public native boolean setUserNote(String txid, String note);
-
-    public native String getUserNote(String txid);
-
-    public native String getTxKey(String txid);
-
-    public void addAccount() {
-        addAccount(NEW_ACCOUNT_NAME);
-    }
-
-    public native void addAccount(String label);
-
-    public String getAccountLabel() {
-        return getAccountLabel(accountIndex);
-    }
-
-//virtual std::string signMessage(const std::string &message) = 0;
-//virtual bool verifySignedMessage(const std::string &message, const std::string &addres, const std::string &signature) const = 0;
-
-//virtual bool parse_uri(const std::string &uri, std::string &address, std::string &payment_id, uint64_t &tvAmount, std::string &tx_description, std::string &recipient_name, std::vector<std::string> &unknown_parameters, std::string &error) = 0;
-//virtual bool rescanSpent() = 0;
-
-    public void setAccountLabel(String label) {
-        setAccountLabel(accountIndex, label);
-    }
-
-    public String getAccountLabel(int accountIndex) {
-        String label = getSubaddressLabel(accountIndex, 0);
-        if (label.equals(NEW_ACCOUNT_NAME)) {
-            String address = getAddress(accountIndex);
-            int len = address.length();
             label = address.substring(0, 6) +
-                    "\u2026" + address.substring(len - 6, len);
+                    "\u2026" + address.substring(len - 6, len)
         }
-        return label;
+        return label
     }
 
-    public String getSubaddressLabel(int addressIndex) {
+    fun getSubaddressLabel(addressIndex: Int): String {
-        return getSubaddressLabel(accountIndex, addressIndex);
+        return getSubaddressLabel(accountIndex, addressIndex)
     }
 
-    public native String getSubaddressLabel(int accountIndex, int addressIndex);
+    private external fun getSubaddressLabel(accountIndex: Int, addressIndex: Int): String
-
+    private fun setAccountLabel(accountIndex: Int, label: String?) {
-    public void setAccountLabel(int accountIndex, String label) {
+        setSubaddressLabel(accountIndex, 0, label)
-        setSubaddressLabel(accountIndex, 0, label);
     }
 
-    public void setSubaddressLabel(int addressIndex, String label) {
+    fun setSubaddressLabel(addressIndex: Int, label: String?) {
-        setSubaddressLabel(accountIndex, addressIndex, label);
+        setSubaddressLabel(accountIndex, addressIndex, label)
-        refreshHistory();
+        refreshHistory()
     }
 
-    public native void setSubaddressLabel(int accountIndex, int addressIndex, String label);
+    private external fun setSubaddressLabel(accountIndex: Int, addressIndex: Int, label: String?)
+    external fun getNumAccounts(): Int
+    val numSubaddresses: Int
+        get() = getNumSubaddresses(accountIndex)
 
-    public native int getNumAccounts();
+    private external fun getNumSubaddresses(accountIndex: Int): Int
+    val newSubaddress: String
+        get() = getNewSubaddress(accountIndex)
 
-    public int getNumSubaddresses() {
+    private fun getNewSubaddress(accountIndex: Int): String {
-        return getNumSubaddresses(accountIndex);
+        val timeStamp = SimpleDateFormat("yyyy-MM-dd-HH:mm:ss", Locale.US).format(Date())
+        addSubaddress(accountIndex, timeStamp)
+        val subaddress = getLastSubaddress(accountIndex)
+        Timber.d("%d: %s", getNumSubaddresses(accountIndex) - 1, subaddress)
+        return subaddress
     }
 
-    public native int getNumSubaddresses(int accountIndex);
+    external fun addSubaddress(accountIndex: Int, label: String?)
-
+    private fun getLastSubaddress(accountIndex: Int): String {
-    public String getNewSubaddress() {
+        return getSubaddress(accountIndex, getNumSubaddresses(accountIndex) - 1)
-        return getNewSubaddress(accountIndex);
     }
 
-    public String getNewSubaddress(int accountIndex) {
+    val deviceType: Device
-        String timeStamp = new SimpleDateFormat("yyyy-MM-dd-HH:mm:ss", Locale.US).format(new Date());
+        get() {
-        addSubaddress(accountIndex, timeStamp);
+            val device = getDeviceTypeJ()
-        String subaddress = getLastSubaddress(accountIndex);
+            return Device.values()[device + 1] // mapping is monero+1=android
-        Timber.d("%d: %s", getNumSubaddresses(accountIndex) - 1, subaddress);
-        return subaddress;
-    }
-
-    public native void addSubaddress(int accountIndex, String label);
-
-    public String getLastSubaddress(int accountIndex) {
-        return getSubaddress(accountIndex, getNumSubaddresses(accountIndex) - 1);
-    }
-
-    public Wallet.Device getDeviceType() {
-        int device = getDeviceTypeJ();
-        return Wallet.Device.values()[device + 1]; // mapping is monero+1=android
-    }
-
-    private native int getDeviceTypeJ();
-
-    public enum Device {
-        Device_Undefined(0, 0),
-        Device_Software(50, 200),
-        Device_Ledger(5, 20);
-        private final int accountLookahead;
-        private final int subaddressLookahead;
-
-        Device(int accountLookahead, int subaddressLookahead) {
-            this.accountLookahead = accountLookahead;
-            this.subaddressLookahead = subaddressLookahead;
         }
 
-        public int getAccountLookahead() {
+    private external fun getDeviceTypeJ(): Int
-            return accountLookahead;
+
+    enum class Device(val accountLookahead: Int, val subaddressLookahead: Int) {
+        Device_Undefined(0, 0), Device_Software(50, 200), Device_Ledger(5, 20)
+
+    }
+
+    enum class StatusEnum {
+        Status_Ok, Status_Error, Status_Critical
+    }
+
+    enum class ConnectionStatus {
+        ConnectionStatus_Disconnected, ConnectionStatus_Connected, ConnectionStatus_WrongVersion
+    }
+
+    class Status internal constructor(status: Int, @JvmField val errorString: String) {
+        val status: StatusEnum
+        @JvmField
+        var connectionStatus: ConnectionStatus? = null // optional
+
+        init {
+            this.status = StatusEnum.values()[status]
         }
 
-        public int getSubaddressLookahead() {
+        val isOk: Boolean
-            return subaddressLookahead;
+            get() = (status == StatusEnum.Status_Ok
+                    && (connectionStatus == null || connectionStatus == ConnectionStatus.ConnectionStatus_Connected))
+
+        override fun toString(): String {
+            return "Wallet.Status: $status/$errorString/$connectionStatus"
         }
     }
 
-    public enum StatusEnum {
+    companion object {
-        Status_Ok,
+        const val SWEEP_ALL = Long.MAX_VALUE
-        Status_Error,
+        private const val NEW_ACCOUNT_NAME = "Untitled account" // src/wallet/wallet2.cpp:941
-        Status_Critical
+
+        init {
+            System.loadLibrary("monerujo")
+        }
+
+        @JvmStatic
+        external fun getDisplayAmount(amount: Long): String
+        @JvmStatic
+        external fun getAmountFromString(amount: String?): Long
+        @JvmStatic
+        external fun getAmountFromDouble(amount: Double): Long
+        @JvmStatic
+        external fun generatePaymentId(): String
+        @JvmStatic
+        external fun isPaymentIdValid(payment_id: String): Boolean
+        @JvmStatic
+        fun isAddressValid(address: String): Boolean {
+            return instance?.networkType?.value?.let { isAddressValid(address, it) } == true
+        }
+        @JvmStatic
+        external fun isAddressValid(address: String?, networkType: Int): Boolean
+        @JvmStatic
+        external fun getPaymentIdFromAddress(address: String?, networkType: Int): String?
+        @JvmStatic
+        external fun getMaximumAllowedAmount(): Long
     }
-
+}
-    public enum ConnectionStatus {
-        ConnectionStatus_Disconnected,
-        ConnectionStatus_Connected,
-        ConnectionStatus_WrongVersion
-    }
-
-    static public class Status {
-        final private StatusEnum status;
-        final private String errorString;
-        @Nullable
-        private ConnectionStatus connectionStatus; // optional
-
-        Status(int status, String errorString) {
-            this.status = StatusEnum.values()[status];
-            this.errorString = errorString;
-        }
-
-        public StatusEnum getStatus() {
-            return status;
-        }
-
-        public String getErrorString() {
-            return errorString;
-        }
-
-        @Nullable
-        public ConnectionStatus getConnectionStatus() {
-            return connectionStatus;
-        }
-
-        public void setConnectionStatus(@Nullable ConnectionStatus connectionStatus) {
-            this.connectionStatus = connectionStatus;
-        }
-
-        public boolean isOk() {
-            return (getStatus() == StatusEnum.Status_Ok)
-                    && ((getConnectionStatus() == null) ||
-                    (getConnectionStatus() == ConnectionStatus.ConnectionStatus_Connected));
-        }
-
-        @Override
-        @NonNull
-        public String toString() {
-            return "Wallet.Status: " + status + "/" + errorString + "/" + connectionStatus;
-        }
-    }
-
-}

app/src/main/java/net/mynero/wallet/model/WalletListener.kt

@@ -13,17 +13,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.model
 
-package net.mynero.wallet.model;
+interface WalletListener {
-
-public interface WalletListener {
     /**
      * moneySpent - called when money spent
      *
      * @param txId   - transaction id
      * @param amount - tvAmount
      */
-    void moneySpent(String txId, long amount);
+    fun moneySpent(txId: String?, amount: Long)
 
     /**
      * moneyReceived - called when money received
@@ -31,7 +30,7 @@ public interface WalletListener {
      * @param txId   - transaction id
      * @param amount - tvAmount
      */
-    void moneyReceived(String txId, long amount);
+    fun moneyReceived(txId: String?, amount: Long)
 
     /**
      * unconfirmedMoneyReceived - called when payment arrived in tx pool
@@ -39,23 +38,22 @@ public interface WalletListener {
      * @param txId   - transaction id
      * @param amount - tvAmount
      */
-    void unconfirmedMoneyReceived(String txId, long amount);
+    fun unconfirmedMoneyReceived(txId: String?, amount: Long)
 
     /**
      * newBlock      - called when new block received
      *
      * @param height - block height
      */
-    void newBlock(long height);
+    fun newBlock(height: Long)
 
     /**
      * updated  - generic callback, called when any event (sent/received/block reveived/etc) happened with the wallet;
      */
-    void updated();
+    fun updated()
 
     /**
      * refreshed - called when wallet refreshed by background thread or explicitly refreshed by calling "refresh" synchronously
      */
-    void refreshed();
+    fun refreshed()
-
+}
-}

app/src/main/java/net/mynero/wallet/model/WalletManager.java

@@ -1,366 +0,0 @@
-/*
- * Copyright (c) 2017 m2049r
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.model;
-
-import net.mynero.wallet.data.Node;
-import net.mynero.wallet.util.RestoreHeight;
-
-import java.io.File;
-import java.io.FilenameFilter;
-import java.util.ArrayList;
-import java.util.Calendar;
-import java.util.List;
-
-import timber.log.Timber;
-
-public class WalletManager {
-
-    //TODO: maybe put these in an enum like in monero core - but why?
-    static public int LOGLEVEL_SILENT = -1;
-    static public int LOGLEVEL_WARN = 0;
-    static public int LOGLEVEL_INFO = 1;
-    static public int LOGLEVEL_DEBUG = 2;
-    static public int LOGLEVEL_TRACE = 3;
-    static public int LOGLEVEL_MAX = 4;
-    // no need to keep a reference to the REAL WalletManager (we get it every tvTime we need it)
-    private static WalletManager Instance = null;
-
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    private final NetworkType networkType = NetworkType.NetworkType_Mainnet;
-    private Wallet managedWallet = null;
-    private String daemonAddress = null;
-    private String daemonUsername = "";
-    private String daemonPassword = "";
-    private String proxy = "";
-
-    public static synchronized WalletManager getInstance() {
-        if (WalletManager.Instance == null) {
-            WalletManager.Instance = new WalletManager();
-        }
-
-        return WalletManager.Instance;
-    }
-
-    static public String addressPrefix(NetworkType networkType) {
-        switch (networkType) {
-            case NetworkType_Testnet:
-                return "9A-";
-            case NetworkType_Mainnet:
-                return "4-";
-            case NetworkType_Stagenet:
-                return "5-";
-            default:
-                throw new IllegalStateException("Unsupported Network: " + networkType);
-        }
-    }
-
-    static public native void initLogger(String argv0, String defaultLogBaseName);
-
-    static public native void setLogLevel(int level);
-
-    static public native void logDebug(String category, String message);
-
-    static public native void logInfo(String category, String message);
-
-    static public native void logWarning(String category, String message);
-
-    static public native void logError(String category, String message);
-
-    static public native String moneroVersion();
-
-    public String addressPrefix() {
-        return addressPrefix(getNetworkType());
-    }
-
-    public Wallet getWallet() {
-        return managedWallet;
-    }
-
-    private void manageWallet(Wallet wallet) {
-        Timber.d("Managing %s", wallet.getName());
-        managedWallet = wallet;
-    }
-
-    private void unmanageWallet(Wallet wallet) {
-        if (wallet == null) {
-            throw new IllegalArgumentException("Cannot unmanage null!");
-        }
-        if (getWallet() == null) {
-            throw new IllegalStateException("No wallet under management!");
-        }
-        if (getWallet() != wallet) {
-            throw new IllegalStateException(wallet.getName() + " not under management!");
-        }
-        Timber.d("Unmanaging %s", managedWallet.getName());
-        managedWallet = null;
-    }
-
-    public Wallet createWallet(File aFile, String password, String language, long height) {
-        long walletHandle = createWalletJ(aFile.getAbsolutePath(), password, language, getNetworkType().getValue());
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        if (wallet.getStatus().isOk()) {
-            // (Re-)Estimate restore height based on what we know
-            final long oldHeight = wallet.getRestoreHeight();
-            // Go back 4 days if we don't have a precise restore height
-            Calendar restoreDate = Calendar.getInstance();
-            restoreDate.add(Calendar.DAY_OF_MONTH, 0);
-            final long restoreHeight =
-                    (height > -1) ? height : RestoreHeight.getInstance().getHeight(restoreDate.getTime());
-            wallet.setRestoreHeight(restoreHeight);
-            Timber.d("Changed Restore Height from %d to %d", oldHeight, wallet.getRestoreHeight());
-            wallet.setPassword(password); // this rewrites the keys file (which contains the restore height)
-        } else
-            Timber.e(wallet.getStatus().toString());
-        return wallet;
-    }
-
-    //public native List<String> findWallets(String path); // this does not work - some error in boost
-
-    private native long createWalletJ(String path, String password, String language, int networkType);
-
-    public Wallet createWalletPolyseed(File aFile, String password, String passphrase, String language) {
-        long walletHandle = createWalletPolyseedJ(aFile.getAbsolutePath(), password, passphrase, language, getNetworkType().getValue());
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        if (wallet.getStatus().isOk()) {
-            wallet.setPassword(password); // this rewrites the keys file (which contains the restore height)
-        } else
-            Timber.e(wallet.getStatus().toString());
-        return wallet;
-    }
-    private native long createWalletPolyseedJ(String path, String password, String passphrase, String language, int networkType);
-
-    public Wallet openAccount(String path, int accountIndex, String password) {
-        long walletHandle = openWalletJ(path, password, getNetworkType().getValue());
-        Wallet wallet = new Wallet(walletHandle, accountIndex);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-//TODO virtual bool checkPayment(const std::string &address, const std::string &txid, const std::string &txkey, const std::string &daemon_address, uint64_t &received, uint64_t &height, std::string &error) const = 0;
-
-    public Wallet openWallet(String path, String password) {
-        long walletHandle = openWalletJ(path, password, getNetworkType().getValue());
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-    private native long openWalletJ(String path, String password, int networkType);
-
-    public Wallet recoveryWallet(File aFile, String password,
-                                 String mnemonic, String offset,
-                                 long restoreHeight) {
-        long walletHandle = recoveryWalletJ(aFile.getAbsolutePath(), password,
-                mnemonic, offset,
-                getNetworkType().getValue(), restoreHeight);
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-    private native long recoveryWalletJ(String path, String password,
-                                        String mnemonic, String offset,
-                                        int networkType, long restoreHeight);
-
-    public Wallet recoveryWalletPolyseed(File aFile, String password,
-                                 String mnemonic, String offset) {
-        long walletHandle = recoveryWalletPolyseedJ(aFile.getAbsolutePath(), password,
-                mnemonic, offset,
-                getNetworkType().getValue());
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-    private native long recoveryWalletPolyseedJ(String path, String password,
-                                        String mnemonic, String offset,
-                                        int networkType);
-
-    public Wallet createWalletWithKeys(File aFile, String password, String language, long restoreHeight,
-                                       String addressString, String viewKeyString, String spendKeyString) {
-        long walletHandle = createWalletFromKeysJ(aFile.getAbsolutePath(), password,
-                language, getNetworkType().getValue(), restoreHeight,
-                addressString, viewKeyString, spendKeyString);
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-    private native long createWalletFromKeysJ(String path, String password,
-                                              String language,
-                                              int networkType,
-                                              long restoreHeight,
-                                              String addressString,
-                                              String viewKeyString,
-                                              String spendKeyString);
-
-    public Wallet createWalletFromDevice(File aFile, String password, long restoreHeight,
-                                         String deviceName) {
-        long walletHandle = createWalletFromDeviceJ(aFile.getAbsolutePath(), password,
-                getNetworkType().getValue(), deviceName, restoreHeight,
-                "5:20");
-        Wallet wallet = new Wallet(walletHandle);
-        manageWallet(wallet);
-        return wallet;
-    }
-
-    private native long createWalletFromDeviceJ(String path, String password,
-                                                int networkType,
-                                                String deviceName,
-                                                long restoreHeight,
-                                                String subaddressLookahead);
-
-    public native boolean closeJ(Wallet wallet);
-
-    public boolean close(Wallet wallet) {
-        unmanageWallet(wallet);
-        boolean closed = closeJ(wallet);
-        if (!closed) {
-            // in case we could not close it
-            // we manage it again
-            manageWallet(wallet);
-        }
-        return closed;
-    }
-
-    public boolean walletExists(File aFile) {
-        return walletExists(aFile.getAbsolutePath());
-    }
-
-    public native boolean walletExists(String path);
-
-    public native boolean verifyWalletPassword(String keys_file_name, String password, boolean watch_only);
-
-    public boolean verifyWalletPasswordOnly(String keys_file_name, String password) {
-        return queryWalletDeviceJ(keys_file_name, password) >= 0;
-    }
-
-    public Wallet.Device queryWalletDevice(String keys_file_name, String password) {
-        int device = queryWalletDeviceJ(keys_file_name, password);
-        return Wallet.Device.values()[device + 1]; // mapping is monero+1=android
-    }
-
-    private native int queryWalletDeviceJ(String keys_file_name, String password);
-
-    public List<WalletInfo> findWallets(File path) {
-        List<WalletInfo> wallets = new ArrayList<>();
-        Timber.d("Scanning: %s", path.getAbsolutePath());
-        File[] found = path.listFiles(new FilenameFilter() {
-            public boolean accept(File dir, String filename) {
-                return filename.endsWith(".keys");
-            }
-        });
-        for (int i = 0; i < found.length; i++) {
-            String filename = found[i].getName();
-            File f = new File(found[i].getParent(), filename.substring(0, filename.length() - 5)); // 5 is length of ".keys"+1
-            wallets.add(new WalletInfo(f));
-        }
-        return wallets;
-    }
-
-    public NetworkType getNetworkType() {
-        return networkType;
-    }
-
-    // this should not be called on the main thread as it connects to the node (and takes a long time)
-    public void setDaemon(Node node) {
-        if (node != null) {
-            this.daemonAddress = node.getAddress();
-            if (networkType != node.getNetworkType())
-                throw new IllegalArgumentException("network type does not match");
-            this.daemonUsername = node.getUsername();
-            this.daemonPassword = node.getPassword();
-            setDaemonAddressJ(daemonAddress);
-        } else {
-            this.daemonAddress = null;
-            this.daemonUsername = "";
-            this.daemonPassword = "";
-            //setDaemonAddressJ(""); // don't disconnect as monero code blocks for many seconds!
-            //TODO: need to do something about that later
-        }
-    }
-
-    public String getDaemonAddress() {
-        if (daemonAddress == null) {
-            throw new IllegalStateException("use setDaemon() to initialise daemon and net first!");
-        }
-        return this.daemonAddress;
-    }
-
-    private native void setDaemonAddressJ(String address);
-
-    public String getDaemonUsername() {
-        return daemonUsername;
-    }
-
-    public String getDaemonPassword() {
-        return daemonPassword;
-    }
-
-    public native int getDaemonVersion();
-
-//TODO static std::tuple<bool, std::string, std::string, std::string, std::string> checkUpdates(const std::string &software, const std::string &subdir);
-
-    public native long getBlockchainHeight();
-
-    public native long getBlockchainTargetHeight();
-
-    public native long getNetworkDifficulty();
-
-    public native double getMiningHashRate();
-
-    public native long getBlockTarget();
-
-    public native boolean isMining();
-
-    public native boolean startMining(String address, boolean background_mining, boolean ignore_battery);
-
-    public native boolean stopMining();
-
-    public native String resolveOpenAlias(String address, boolean dnssec_valid);
-
-    public String getProxy() {
-        return proxy;
-    }
-
-    public boolean setProxy(String address) {
-        this.proxy = address;
-        return setProxyJ(address);
-    }
-
-    public native boolean setProxyJ(String address);
-
-    public class WalletInfo implements Comparable<WalletInfo> {
-        final private File path;
-        final private String name;
-
-        public WalletInfo(File wallet) {
-            path = wallet.getParentFile();
-            name = wallet.getName();
-        }
-
-        @Override
-        public int compareTo(WalletInfo another) {
-            return name.toLowerCase().compareTo(another.name.toLowerCase());
-        }
-    }
-}

app/src/main/java/net/mynero/wallet/model/WalletManager.kt

@@ -0,0 +1,370 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.mynero.wallet.model
+
+import net.mynero.wallet.data.Node
+import net.mynero.wallet.util.RestoreHeight
+import timber.log.Timber
+import java.io.File
+import java.util.Calendar
+import java.util.Locale
+
+class WalletManager {
+    @JvmField
+    val networkType = NetworkType.NetworkType_Mainnet
+    var wallet: Wallet? = null
+        private set
+    private var daemonAddress: String? = null
+    var daemonUsername = ""
+        private set
+    var daemonPassword = ""
+        private set
+    var proxy = ""
+        private set
+
+    private fun manageWallet(wallet: Wallet) {
+        Timber.d("Managing %s", wallet.name)
+        this.wallet = wallet
+    }
+
+    private fun unmanageWallet(wallet: Wallet?) {
+        requireNotNull(wallet) { "Cannot unmanage null!" }
+        checkNotNull(this.wallet) { "No wallet under management!" }
+        check(this.wallet === wallet) { wallet.name + " not under management!" }
+        Timber.d("Unmanaging %s", wallet.name)
+        this.wallet = null
+    }
+
+    fun createWallet(aFile: File, password: String, language: String, height: Long): Wallet {
+        val walletHandle = createWalletJ(aFile.absolutePath, password, language, networkType.value)
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        if (wallet.status.isOk) {
+            // (Re-)Estimate restore height based on what we know
+            val oldHeight = wallet.getRestoreHeight()
+            // Go back 4 days if we don't have a precise restore height
+            val restoreDate = Calendar.getInstance()
+            restoreDate.add(Calendar.DAY_OF_MONTH, 0)
+            val restoreHeight =
+                if (height > -1) height else RestoreHeight.instance?.getHeight(restoreDate.time)
+            if (restoreHeight != null) {
+                wallet.setRestoreHeight(restoreHeight)
+            }
+            Timber.d("Changed Restore Height from %d to %d", oldHeight, wallet.getRestoreHeight())
+            wallet.setPassword(password) // this rewrites the keys file (which contains the restore height)
+        } else Timber.e(wallet.status.toString())
+        return wallet
+    }
+
+    //public native List<String> findWallets(String path); // this does not work - some error in boost
+    private external fun createWalletJ(
+        path: String,
+        password: String,
+        language: String,
+        networkType: Int
+    ): Long
+
+    fun createWalletPolyseed(
+        aFile: File,
+        password: String,
+        passphrase: String,
+        language: String
+    ): Wallet {
+        val walletHandle = createWalletPolyseedJ(
+            aFile.absolutePath,
+            password,
+            passphrase,
+            language,
+            networkType.value
+        )
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        if (wallet.status.isOk) {
+            wallet.setPassword(password) // this rewrites the keys file (which contains the restore height)
+        } else Timber.e(wallet.status.toString())
+        return wallet
+    }
+
+    private external fun createWalletPolyseedJ(
+        path: String,
+        password: String,
+        passphrase: String,
+        language: String,
+        networkType: Int
+    ): Long
+
+    fun openAccount(path: String, accountIndex: Int, password: String): Wallet {
+        val walletHandle = openWalletJ(path, password, networkType.value)
+        val wallet = Wallet(walletHandle, accountIndex)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    //TODO virtual bool checkPayment(const std::string &address, const std::string &txid, const std::string &txkey, const std::string &daemon_address, uint64_t &received, uint64_t &height, std::string &error) const = 0;
+    fun openWallet(path: String, password: String): Wallet {
+        val walletHandle = openWalletJ(path, password, networkType.value)
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    private external fun openWalletJ(path: String, password: String, networkType: Int): Long
+    fun recoveryWallet(
+        aFile: File, password: String,
+        mnemonic: String, offset: String,
+        restoreHeight: Long
+    ): Wallet {
+        val walletHandle = recoveryWalletJ(
+            aFile.absolutePath, password,
+            mnemonic, offset,
+            networkType.value, restoreHeight
+        )
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    private external fun recoveryWalletJ(
+        path: String, password: String,
+        mnemonic: String, offset: String,
+        networkType: Int, restoreHeight: Long
+    ): Long
+
+    fun recoveryWalletPolyseed(
+        aFile: File, password: String,
+        mnemonic: String, offset: String
+    ): Wallet {
+        val walletHandle = recoveryWalletPolyseedJ(
+            aFile.absolutePath, password,
+            mnemonic, offset,
+            networkType.value
+        )
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    private external fun recoveryWalletPolyseedJ(
+        path: String, password: String,
+        mnemonic: String, offset: String,
+        networkType: Int
+    ): Long
+
+    fun createWalletWithKeys(
+        aFile: File, password: String, language: String, restoreHeight: Long,
+        addressString: String, viewKeyString: String, spendKeyString: String
+    ): Wallet {
+        val walletHandle = createWalletFromKeysJ(
+            aFile.absolutePath, password,
+            language, networkType.value, restoreHeight,
+            addressString, viewKeyString, spendKeyString
+        )
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    private external fun createWalletFromKeysJ(
+        path: String, password: String,
+        language: String,
+        networkType: Int,
+        restoreHeight: Long,
+        addressString: String,
+        viewKeyString: String,
+        spendKeyString: String
+    ): Long
+
+    fun createWalletFromDevice(
+        aFile: File, password: String, restoreHeight: Long,
+        deviceName: String
+    ): Wallet {
+        val walletHandle = createWalletFromDeviceJ(
+            aFile.absolutePath, password,
+            networkType.value, deviceName, restoreHeight,
+            "5:20"
+        )
+        val wallet = Wallet(walletHandle)
+        manageWallet(wallet)
+        return wallet
+    }
+
+    private external fun createWalletFromDeviceJ(
+        path: String, password: String,
+        networkType: Int,
+        deviceName: String,
+        restoreHeight: Long,
+        subaddressLookahead: String
+    ): Long
+
+    external fun closeJ(wallet: Wallet?): Boolean
+    fun close(wallet: Wallet): Boolean {
+        unmanageWallet(wallet)
+        val closed = closeJ(wallet)
+        if (!closed) {
+            // in case we could not close it
+            // we manage it again
+            manageWallet(wallet)
+        }
+        return closed
+    }
+
+    fun walletExists(aFile: File): Boolean {
+        return walletExists(aFile.absolutePath)
+    }
+
+    external fun walletExists(path: String?): Boolean
+    external fun verifyWalletPassword(
+        keys_file_name: String?,
+        password: String?,
+        watch_only: Boolean
+    ): Boolean
+
+    fun verifyWalletPasswordOnly(keys_file_name: String, password: String): Boolean {
+        return queryWalletDeviceJ(keys_file_name, password) >= 0
+    }
+
+    fun queryWalletDevice(keys_file_name: String, password: String): Wallet.Device {
+        val device = queryWalletDeviceJ(keys_file_name, password)
+        return Wallet.Device.values()[device + 1] // mapping is monero+1=android
+    }
+
+    private external fun queryWalletDeviceJ(keys_file_name: String, password: String): Int
+    fun findWallets(path: File): List<WalletInfo> {
+        val wallets: MutableList<WalletInfo> = ArrayList()
+        Timber.d("Scanning: %s", path.absolutePath)
+        val found = path.listFiles { dir, filename -> filename.endsWith(".keys") } ?: return emptyList()
+        for (i in found.indices) {
+            val filename = found[i].name
+            val f = File(
+                found[i].parent,
+                filename.substring(0, filename.length - 5)
+            ) // 5 is length of ".keys"+1
+            wallets.add(WalletInfo(f))
+        }
+        return wallets
+    }
+
+    // this should not be called on the main thread as it connects to the node (and takes a long time)
+    fun setDaemon(node: Node?) {
+        if (node != null) {
+            daemonAddress = node.address
+            require(networkType === node.networkType) { "network type does not match" }
+            daemonUsername = node.username
+            daemonPassword = node.password
+            daemonAddress?.let { addr -> setDaemonAddressJ(addr) }
+        } else {
+            daemonAddress = null
+            daemonUsername = ""
+            daemonPassword = ""
+            //setDaemonAddressJ(""); // don't disconnect as monero code blocks for many seconds!
+            //TODO: need to do something about that later
+        }
+    }
+
+    fun getDaemonAddress(): String? {
+        checkNotNull(daemonAddress) { "use setDaemon() to initialise daemon and net first!" }
+        return daemonAddress
+    }
+
+    private external fun setDaemonAddressJ(address: String)
+    external fun getDaemonVersion(): Int
+    external fun getBlockchainHeight(): Long
+    external fun getBlockchainTargetHeight(): Long
+    external fun getNetworkDifficulty(): Long
+    external fun getMiningHashRate(): Double
+    external fun getBlockTarget(): Long
+    external fun isMining(): Boolean
+
+    external fun startMining(
+        address: String?,
+        background_mining: Boolean,
+        ignore_battery: Boolean
+    ): Boolean
+
+    external fun stopMining(): Boolean
+    external fun resolveOpenAlias(address: String?, dnssec_valid: Boolean): String?
+    fun setProxy(address: String): Boolean {
+        proxy = address
+        return setProxyJ(address)
+    }
+
+    private external fun setProxyJ(address: String?): Boolean
+    inner class WalletInfo(wallet: File) : Comparable<WalletInfo> {
+        private val path: File
+        private val name: String
+
+        init {
+            path = wallet.parentFile
+            name = wallet.name
+        }
+
+        override fun compareTo(other: WalletInfo): Int {
+            return name.lowercase(Locale.getDefault())
+                .compareTo(other.name.lowercase(Locale.getDefault()))
+        }
+    }
+
+    companion object {
+        //TODO: maybe put these in an enum like in monero core - but why?
+        @JvmField
+        var LOGLEVEL_SILENT = -1
+        var LOGLEVEL_WARN = 0
+        var LOGLEVEL_INFO = 1
+        var LOGLEVEL_DEBUG = 2
+        var LOGLEVEL_TRACE = 3
+        var LOGLEVEL_MAX = 4
+
+        // no need to keep a reference to the REAL WalletManager (we get it every tvTime we need it)
+        @get:Synchronized
+        @JvmStatic
+        var instance: WalletManager? = null
+            get() {
+                if (field == null) {
+                    field = WalletManager()
+                }
+                return field
+            }
+            private set
+
+        init {
+            System.loadLibrary("monerujo")
+        }
+
+        fun addressPrefix(networkType: NetworkType): String {
+            return when (networkType) {
+                NetworkType.NetworkType_Testnet -> "9A-"
+                NetworkType.NetworkType_Mainnet -> "4-"
+                NetworkType.NetworkType_Stagenet -> "5-"
+                else -> throw IllegalStateException("Unsupported Network: $networkType")
+            }
+        }
+
+        @JvmStatic
+        external fun initLogger(argv0: String?, defaultLogBaseName: String?)
+        @JvmStatic
+        external fun setLogLevel(level: Int)
+        @JvmStatic
+        external fun logDebug(category: String?, message: String?)
+        @JvmStatic
+        external fun logInfo(category: String?, message: String?)
+        @JvmStatic
+        external fun logWarning(category: String?, message: String?)
+        @JvmStatic
+        external fun logError(category: String?, message: String?)
+        @JvmStatic
+        external fun moneroVersion(): String?
+    }
+}

app/src/main/java/net/mynero/wallet/service/BalanceService.java

@@ -33,7 +33,7 @@ public class BalanceService extends ServiceBase {
         long unlocked = 0;
         for(CoinsInfo coinsInfo : UTXOService.getInstance().getUtxos()) {
             if(!coinsInfo.isSpent() && !coinsInfo.isFrozen() && coinsInfo.isUnlocked() && !UTXOService.getInstance().isCoinFrozen(coinsInfo)) {
-                unlocked += coinsInfo.getAmount();
+                unlocked += coinsInfo.amount;
             }
         }
         return unlocked;
@@ -43,7 +43,7 @@ public class BalanceService extends ServiceBase {
         long total = 0;
         for(CoinsInfo coinsInfo : UTXOService.getInstance().getUtxos()) {
             if(!coinsInfo.isSpent() && !coinsInfo.isFrozen() && !UTXOService.getInstance().isCoinFrozen(coinsInfo)) {
-                total += coinsInfo.getAmount();
+                total += coinsInfo.amount;
             }
         }
         return total;

app/src/main/java/net/mynero/wallet/service/MoneroHandlerThread.java

@@ -100,7 +100,7 @@ public class MoneroHandlerThread extends Thread implements WalletListener {
 
     @Override
     public void refreshed() {
-        Wallet.ConnectionStatus status = wallet.getFullStatus().getConnectionStatus();
+        Wallet.ConnectionStatus status = wallet.getFullStatus().connectionStatus;
         if (status == Wallet.ConnectionStatus.ConnectionStatus_Disconnected || status == null) {
             if (triesLeft > 0) {
                 wallet.startRefresh();
@@ -162,7 +162,7 @@ public class MoneroHandlerThread extends Thread implements WalletListener {
 
     private List<TransactionOutput> maybeAddDonationOutputs(long amount, List<TransactionOutput> outputs, List<String> preferredInputs) throws Exception {
         TransactionOutput mainDestination = outputs.get(0); // at this point, for now, we should only have one item in the list. TODO: add multi-dest/pay-to-many feature in the UI
-        String paymentId = Wallet.getPaymentIdFromAddress(mainDestination.getDestination(), WalletManager.getInstance().getNetworkType().getValue());
+        String paymentId = Wallet.getPaymentIdFromAddress(mainDestination.destination, WalletManager.getInstance().networkType.value);
         ArrayList<TransactionOutput> newOutputs = new ArrayList<>(outputs);
         boolean donatePerTx = PrefService.getInstance().getBoolean(Constants.PREF_DONATE_PER_TX, false);
         if(donatePerTx && paymentId.isEmpty()) { // only attach donation when no payment id is needed (i.e. integrated address)
@@ -205,8 +205,8 @@ public class MoneroHandlerThread extends Thread implements WalletListener {
         if (!sendAll) {
             long amountSelected = 0;
             for (CoinsInfo coinsInfo : UTXOService.getInstance().getUtxos()) {
-                if (selectedUtxos.contains(coinsInfo.getKeyImage())) {
+                if (selectedUtxos.contains(coinsInfo.keyImage)) {
-                    amountSelected += coinsInfo.getAmount();
+                    amountSelected += coinsInfo.amount;
                 }
             }
 

app/src/main/java/net/mynero/wallet/service/UTXOService.java

@@ -57,10 +57,10 @@ public class UTXOService extends ServiceBase {
     public void toggleFrozen(HashMap<String, CoinsInfo> selectedCoins) {
         ArrayList<String> frozenCoinsCopy = new ArrayList<>(frozenCoins);
         for(CoinsInfo coin : selectedCoins.values()) {
-            if(frozenCoinsCopy.contains(coin.getPubKey())) {
+            if(frozenCoinsCopy.contains(coin.pubKey)) {
-                frozenCoinsCopy.remove(coin.getPubKey());
+                frozenCoinsCopy.remove(coin.pubKey);
             } else {
-                frozenCoinsCopy.add(coin.getPubKey());
+                frozenCoinsCopy.add(coin.pubKey);
             }
         }
         this.frozenCoins = frozenCoinsCopy;
@@ -70,7 +70,7 @@ public class UTXOService extends ServiceBase {
     }
 
     public boolean isCoinFrozen(CoinsInfo coinsInfo) {
-        return frozenCoins.contains(coinsInfo.getPubKey());
+        return frozenCoins.contains(coinsInfo.pubKey);
     }
 
     private void loadFrozenCoins() throws JSONException {
@@ -104,18 +104,18 @@ public class UTXOService extends ServiceBase {
         Collections.sort(utxos);
         //loop through each utxo
         for (CoinsInfo coinsInfo : utxos) {
-            if (!coinsInfo.isSpent() && coinsInfo.isUnlocked() && !coinsInfo.isFrozen() && !frozenCoins.contains(coinsInfo.getPubKey())) { //filter out spent, locked, and frozen outputs
+            if (!coinsInfo.isSpent() && coinsInfo.isUnlocked() && !coinsInfo.isFrozen() && !frozenCoins.contains(coinsInfo.pubKey)) { //filter out spent, locked, and frozen outputs
                 if (sendAll) {
                     // if send all, add all utxos and set amount to send all
-                    selectedUtxos.add(coinsInfo.getKeyImage());
+                    selectedUtxos.add(coinsInfo.keyImage);
                     amountSelected = Wallet.SWEEP_ALL;
                 } else {
                     //if amount selected is still less than amount needed, and the utxos tx hash hasn't already been seen, add utxo
-                    if (amountSelected <= amountWithBasicFee && !seenTxs.contains(coinsInfo.getHash())) {
+                    if (amountSelected <= amountWithBasicFee && !seenTxs.contains(coinsInfo.hash)) {
-                        selectedUtxos.add(coinsInfo.getKeyImage());
+                        selectedUtxos.add(coinsInfo.keyImage);
                         // we don't want to spend multiple utxos from the same transaction, so we prevent that from happening here.
-                        seenTxs.add(coinsInfo.getHash());
+                        seenTxs.add(coinsInfo.hash);
-                        amountSelected += coinsInfo.getAmount();
+                        amountSelected += coinsInfo.amount;
                     }
                 }
             }

app/src/main/java/net/mynero/wallet/util/Constants.java

@@ -1,29 +0,0 @@
-package net.mynero.wallet.util;
-
-public class Constants {
-    public static final String WALLET_NAME = "xmr_wallet";
-    public static final String MNEMONIC_LANGUAGE = "English";
-    public static final String PREF_USES_PASSWORD = "pref_uses_password";
-    public static final String PREF_USES_TOR = "pref_uses_tor";
-    public static final String PREF_PROXY = "pref_proxy";
-    public static final String PREF_NODE_2 = "pref_node_2";
-    public static final String PREF_CUSTOM_NODES = "pref_custom_nodes";
-    public static final String PREF_USES_OFFSET = "pref_uses_offset";
-    public static final String PREF_STREET_MODE = "pref_street_mode";
-    public static final String PREF_MONEROCHAN = "pref_monerochan";
-    public static final String PREF_DONATE_PER_TX = "pref_donate_per_tx";
-    public static final String PREF_FROZEN_COINS = "pref_frozen_coins";
-
-    public static final String URI_PREFIX = "monero:";
-    public static final String URI_ARG_AMOUNT = "tx_amount";
-    public static final String URI_ARG_AMOUNT2 = "amount";
-    public static final String NAV_ARG_TXINFO = "nav_arg_txinfo";
-
-    public static final String STREET_MODE_BALANCE = "#.############";
-    public static final String[] DONATION_ADDRESSES = new String[] {
-            "87BqQYkugEzh6Tuyotm2uc3DzJzKM6MuZaC161e6u1TsQxxPmXVPHpdNRyK47JY4d1hhbe25YVz4e9vTXCLDxvHkRXEAeBC", // primary Mysu Donation address
-            "89QoPxs4cQSGbJrJddwzV3Ca7s2gVYHE1Xd1hGZafuVJVyNKt2LCQhxUdBF57PemxQiX3dmGUZLRRAzfeYyh9pq3GiWsDVo", // second Mysu Donation address
-            "855acibBehTQJdC1f41BHWGq1FiQ5ztiAU7LiJgDUmmyJfDtRpJoo6Mc1en73duUScdeUYjLirACnZpv2C6pPbcZKgumdCS" // third Mysu Donation address
-    };
-    public static final String DONATE_ADDRESS = "87BqQYkugEzh6Tuyotm2uc3DzJzKM6MuZaC161e6u1TsQxxPmXVPHpdNRyK47JY4d1hhbe25YVz4e9vTXCLDxvHkRXEAeBC";
-}

app/src/main/java/net/mynero/wallet/util/Constants.kt

@@ -0,0 +1,29 @@
+package net.mynero.wallet.util
+
+object Constants {
+    const val WALLET_NAME = "xmr_wallet"
+    const val MNEMONIC_LANGUAGE = "English"
+    const val PREF_USES_PASSWORD = "pref_uses_password"
+    const val PREF_USES_TOR = "pref_uses_tor"
+    const val PREF_PROXY = "pref_proxy"
+    const val PREF_NODE_2 = "pref_node_2"
+    const val PREF_CUSTOM_NODES = "pref_custom_nodes"
+    const val PREF_USES_OFFSET = "pref_uses_offset"
+    const val PREF_STREET_MODE = "pref_street_mode"
+    const val PREF_MONEROCHAN = "pref_monerochan"
+    const val PREF_DONATE_PER_TX = "pref_donate_per_tx"
+    const val PREF_FROZEN_COINS = "pref_frozen_coins"
+    const val URI_PREFIX = "monero:"
+    const val URI_ARG_AMOUNT = "tx_amount"
+    const val URI_ARG_AMOUNT2 = "amount"
+    const val NAV_ARG_TXINFO = "nav_arg_txinfo"
+    const val STREET_MODE_BALANCE = "#.############"
+    @JvmField
+    val DONATION_ADDRESSES = arrayOf(
+        "87BqQYkugEzh6Tuyotm2uc3DzJzKM6MuZaC161e6u1TsQxxPmXVPHpdNRyK47JY4d1hhbe25YVz4e9vTXCLDxvHkRXEAeBC",  // primary Mysu Donation address
+        "89QoPxs4cQSGbJrJddwzV3Ca7s2gVYHE1Xd1hGZafuVJVyNKt2LCQhxUdBF57PemxQiX3dmGUZLRRAzfeYyh9pq3GiWsDVo",  // second Mysu Donation address
+        "855acibBehTQJdC1f41BHWGq1FiQ5ztiAU7LiJgDUmmyJfDtRpJoo6Mc1en73duUScdeUYjLirACnZpv2C6pPbcZKgumdCS" // third Mysu Donation address
+    )
+    const val DONATE_ADDRESS =
+        "87BqQYkugEzh6Tuyotm2uc3DzJzKM6MuZaC161e6u1TsQxxPmXVPHpdNRyK47JY4d1hhbe25YVz4e9vTXCLDxvHkRXEAeBC"
+}

app/src/main/java/net/mynero/wallet/util/DateHelper.kt

@@ -13,17 +13,17 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Date
 
-import java.text.ParseException;
+object DateHelper {
-import java.text.SimpleDateFormat;
+    @JvmField
-import java.util.Date;
+    val DATETIME_FORMATTER = SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
-
+    @Throws(ParseException::class)
-public class DateHelper {
+    fun parse(dateString: String): Date {
-    public static final SimpleDateFormat DATETIME_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+        return DATETIME_FORMATTER.parse(dateString.replace("Z$".toRegex(), "+0000"))
-
-    public static Date parse(String dateString) throws ParseException {
-        return DATETIME_FORMATTER.parse(dateString.replaceAll("Z$", "+0000"));
     }
-}
+}

app/src/main/java/net/mynero/wallet/util/DayNightMode.kt

@@ -13,33 +13,23 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import androidx.appcompat.app.AppCompatDelegate
 
-import androidx.appcompat.app.AppCompatDelegate;
+enum class DayNightMode(val nightMode: Int) {
-
-public enum DayNightMode {
     // order must match R.array.daynight_themes
-    AUTO(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM),
+    AUTO(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM), DAY(AppCompatDelegate.MODE_NIGHT_NO), NIGHT(
-    DAY(AppCompatDelegate.MODE_NIGHT_NO),
+        AppCompatDelegate.MODE_NIGHT_YES
-    NIGHT(AppCompatDelegate.MODE_NIGHT_YES),
+    ),
     UNKNOWN(AppCompatDelegate.MODE_NIGHT_UNSPECIFIED);
 
-    final private int nightMode;
+    companion object {
-
+        fun getValue(nightMode: Int): DayNightMode {
-    DayNightMode(int nightMode) {
+            for (mode in values()) {
-        this.nightMode = nightMode;
+                if (mode.nightMode == nightMode) return mode
-    }
+            }
-
+            return UNKNOWN
-    static public DayNightMode getValue(int nightMode) {
-        for (DayNightMode mode : DayNightMode.values()) {
-            if (mode.nightMode == nightMode)
-                return mode;
         }
-        return UNKNOWN;
     }
-
+}
-    public int getNightMode() {
-        return nightMode;
-    }
-}

app/src/main/java/net/mynero/wallet/util/Helper.kt

@@ -13,299 +13,294 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import android.Manifest
+import android.app.Activity
+import android.app.Dialog
+import android.content.ClipData
+import android.content.ClipDescription
+import android.content.ClipboardManager
+import android.content.Context
+import android.content.pm.PackageManager
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.graphics.Canvas
+import android.graphics.drawable.BitmapDrawable
+import android.graphics.drawable.VectorDrawable
+import android.os.Build
+import android.view.WindowManager
+import android.view.animation.Animation
+import android.view.animation.AnimationUtils
+import android.view.inputmethod.InputMethodManager
+import android.widget.Toast
+import androidx.activity.result.ActivityResultLauncher
+import androidx.core.content.ContextCompat
+import net.mynero.wallet.R
+import net.mynero.wallet.model.WalletManager
+import net.mynero.wallet.model.WalletManager.Companion.initLogger
+import net.mynero.wallet.model.WalletManager.Companion.setLogLevel
+import timber.log.Timber
+import java.io.File
+import java.io.IOException
+import java.io.InputStreamReader
+import java.math.BigDecimal
+import java.math.BigInteger
+import java.net.MalformedURLException
+import java.net.SocketTimeoutException
+import java.net.URL
+import java.util.Locale
+import javax.net.ssl.HttpsURLConnection
 
-import android.Manifest;
+object Helper {
-import android.app.Activity;
+    const val NOCRAZYPASS_FLAGFILE = ".nocrazypass"
-import android.app.Dialog;
+    const val XMR_DECIMALS = 12
-import android.content.ClipData;
+    val ONE_XMR = Math.round(Math.pow(10.0, XMR_DECIMALS.toDouble()))
-import android.content.ClipDescription;
+    const val SHOW_EXCHANGERATES = true
-import android.content.ClipboardManager;
+    const val PERMISSIONS_REQUEST_CAMERA = 7
-import android.content.Context;
+    const val HTTP_TIMEOUT = 5000
-import android.content.pm.PackageManager;
+    private const val WALLET_DIR = "wallets"
-import android.graphics.Bitmap;
+    private const val MONERO_DIR = "monero"
-import android.graphics.BitmapFactory;
+    private val HexArray = "0123456789ABCDEF".toCharArray()
-import android.graphics.Canvas;
+    var ALLOW_SHIFT = false
-import android.graphics.drawable.BitmapDrawable;
+    @JvmField
-import android.graphics.drawable.Drawable;
+    var DISPLAY_DIGITS_INFO = 5
-import android.graphics.drawable.VectorDrawable;
+    private var ShakeAnimation: Animation? = null
-import android.view.View;
+    fun getWalletRoot(context: Context): File {
-import android.view.WindowManager;
+        return getStorage(context, WALLET_DIR)
-import android.view.animation.Animation;
-import android.view.animation.AnimationUtils;
-import android.view.inputmethod.InputMethodManager;
-import android.widget.Toast;
-
-import androidx.activity.result.ActivityResultLauncher;
-import androidx.core.content.ContextCompat;
-
-import net.mynero.wallet.R;
-import net.mynero.wallet.model.WalletManager;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.math.BigDecimal;
-import java.math.BigInteger;
-import java.net.MalformedURLException;
-import java.net.SocketTimeoutException;
-import java.net.URL;
-import java.util.Locale;
-
-import javax.net.ssl.HttpsURLConnection;
-
-import timber.log.Timber;
-
-public class Helper {
-    static public final String NOCRAZYPASS_FLAGFILE = ".nocrazypass";
-
-    static public final int XMR_DECIMALS = 12;
-    static public final long ONE_XMR = Math.round(Math.pow(10, Helper.XMR_DECIMALS));
-
-    static public final boolean SHOW_EXCHANGERATES = true;
-    static public final int PERMISSIONS_REQUEST_CAMERA = 7;
-    static final int HTTP_TIMEOUT = 5000;
-    static private final String WALLET_DIR = "wallets";
-    static private final String MONERO_DIR = "monero";
-    private final static char[] HexArray = "0123456789ABCDEF".toCharArray();
-    static public boolean ALLOW_SHIFT = false;
-    static public int DISPLAY_DIGITS_INFO = 5;
-    static private Animation ShakeAnimation;
-
-    static public File getWalletRoot(Context context) {
-        return getStorage(context, WALLET_DIR);
     }
 
-    static public File getStorage(Context context, String folderName) {
+    fun getStorage(context: Context, folderName: String?): File {
-        File dir = new File(context.getFilesDir(), folderName);
+        val dir = File(context.filesDir, folderName)
         if (!dir.exists()) {
-            Timber.i("Creating %s", dir.getAbsolutePath());
+            Timber.i("Creating %s", dir.absolutePath)
-            dir.mkdirs(); // try to make it
+            dir.mkdirs() // try to make it
         }
-        if (!dir.isDirectory()) {
+        if (!dir.isDirectory) {
-            String msg = "Directory " + dir.getAbsolutePath() + " does not exist.";
+            val msg = "Directory " + dir.absolutePath + " does not exist."
-            Timber.e(msg);
+            Timber.e(msg)
-            throw new IllegalStateException(msg);
+            throw IllegalStateException(msg)
         }
-        return dir;
+        return dir
     }
 
-    static public boolean getCameraPermission(Activity context) {
+    fun getCameraPermission(context: Activity): Boolean {
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             if (context.checkSelfPermission(Manifest.permission.CAMERA)
-                    == PackageManager.PERMISSION_DENIED) {
+                == PackageManager.PERMISSION_DENIED
-                Timber.w("Permission denied for CAMERA - requesting it");
+            ) {
-                String[] permissions = {Manifest.permission.CAMERA};
+                Timber.w("Permission denied for CAMERA - requesting it")
-                context.requestPermissions(permissions, PERMISSIONS_REQUEST_CAMERA);
+                val permissions = arrayOf(Manifest.permission.CAMERA)
-                return false;
+                context.requestPermissions(
+                    permissions,
+                    PERMISSIONS_REQUEST_CAMERA
+                )
+                false
             } else {
-                return true;
+                true
             }
         } else {
-            return true;
+            true
         }
     }
 
-    static public boolean getCameraPermission(Activity context, ActivityResultLauncher<String> launcher) {
+    @JvmStatic
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+    fun getCameraPermission(context: Activity, launcher: ActivityResultLauncher<String?>): Boolean {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             if (context.checkSelfPermission(Manifest.permission.CAMERA)
-                    == PackageManager.PERMISSION_DENIED) {
+                == PackageManager.PERMISSION_DENIED
-                Timber.w("Permission denied for CAMERA - requesting it");
+            ) {
-                launcher.launch(Manifest.permission.CAMERA);
+                Timber.w("Permission denied for CAMERA - requesting it")
-                return false;
+                launcher.launch(Manifest.permission.CAMERA)
+                false
             } else {
-                return true;
+                true
             }
         } else {
-            return true;
+            true
         }
     }
 
-    static public File getWalletFile(Context context, String aWalletName) {
+    fun getWalletFile(context: Context, aWalletName: String?): File {
-        File walletDir = getWalletRoot(context);
+        val walletDir = getWalletRoot(context)
-        File f = new File(walletDir, aWalletName);
+        val f = File(walletDir, aWalletName)
-        Timber.d("wallet=%s size= %d", f.getAbsolutePath(), f.length());
+        Timber.d("wallet=%s size= %d", f.absolutePath, f.length())
-        return f;
+        return f
     }
 
-    static public void showKeyboard(Activity act) {
+    fun showKeyboard(act: Activity) {
-        InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
+        val imm = act.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-        final View focus = act.getCurrentFocus();
+        val focus = act.currentFocus
-        if (focus != null)
+        if (focus != null) imm.showSoftInput(focus, InputMethodManager.SHOW_IMPLICIT)
-            imm.showSoftInput(focus, InputMethodManager.SHOW_IMPLICIT);
     }
 
-    static public void hideKeyboard(Activity act) {
+    fun hideKeyboard(act: Activity?) {
-        if (act == null) return;
+        if (act == null) return
-        if (act.getCurrentFocus() == null) {
+        if (act.currentFocus == null) {
-            act.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
+            act.window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN)
         } else {
-            InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
+            val imm = act.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-            imm.hideSoftInputFromWindow((null == act.getCurrentFocus()) ? null : act.getCurrentFocus().getWindowToken(),
+            act.currentFocus?.let {
-                    InputMethodManager.HIDE_NOT_ALWAYS);
+                imm.hideSoftInputFromWindow(
+                    it.windowToken,
+                    InputMethodManager.HIDE_NOT_ALWAYS
+                )
+            }
         }
     }
 
-    static public void showKeyboard(Dialog dialog) {
+    fun showKeyboard(dialog: Dialog) {
-        dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
+        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
     }
 
-    static public void hideKeyboardAlways(Activity act) {
+    fun hideKeyboardAlways(act: Activity) {
-        act.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
+        act.window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN)
     }
 
-    static public BigDecimal getDecimalAmount(long amount) {
+    fun getDecimalAmount(amount: Long): BigDecimal {
-        return new BigDecimal(amount).scaleByPowerOfTen(-XMR_DECIMALS);
+        return BigDecimal(amount).scaleByPowerOfTen(-XMR_DECIMALS)
     }
 
-    static public String getDisplayAmount(long amount) {
+    @JvmStatic
-        return getDisplayAmount(amount, XMR_DECIMALS);
+    fun getDisplayAmount(amount: Long): String {
+        return getDisplayAmount(amount, XMR_DECIMALS)
     }
 
-    static public String getDisplayAmount(long amount, int maxDecimals) {
+    @JvmStatic
+    fun getDisplayAmount(amount: Long, maxDecimals: Int): String {
         // a Java bug does not strip zeros properly if the value is 0
-        if (amount == 0) return "0.00";
+        if (amount == 0L) return "0.00"
-        BigDecimal d = getDecimalAmount(amount)
+        var d = getDecimalAmount(amount)
-                .setScale(maxDecimals, BigDecimal.ROUND_HALF_UP)
+            .setScale(maxDecimals, BigDecimal.ROUND_HALF_UP)
-                .stripTrailingZeros();
+            .stripTrailingZeros()
-        if (d.scale() < 2)
+        if (d.scale() < 2) d = d.setScale(2, BigDecimal.ROUND_UNNECESSARY)
-            d = d.setScale(2, BigDecimal.ROUND_UNNECESSARY);
+        return d.toPlainString()
-        return d.toPlainString();
     }
 
-    static public String getFormattedAmount(double amount, boolean isCrypto) {
+    fun getFormattedAmount(amount: Double, isCrypto: Boolean): String? {
         // at this point selection is XMR in case of error
-        String displayB;
+        val displayB: String?
-        if (isCrypto) {
+        displayB = if (isCrypto) {
-            if ((amount >= 0) || (amount == 0)) {
+            if (amount >= 0 || amount == 0.0) {
-                displayB = String.format(Locale.US, "%,.5f", amount);
+                String.format(Locale.US, "%,.5f", amount)
             } else {
-                displayB = null;
+                null
             }
         } else { // not crypto
-            displayB = String.format(Locale.US, "%,.2f", amount);
+            String.format(Locale.US, "%,.2f", amount)
         }
-        return displayB;
+        return displayB
     }
 
-    static public String getDisplayAmount(double amount) {
+    @JvmStatic
+    fun getDisplayAmount(amount: Double): String {
         // a Java bug does not strip zeros properly if the value is 0
-        BigDecimal d = new BigDecimal(amount)
+        var d = BigDecimal(amount)
-                .setScale(XMR_DECIMALS, BigDecimal.ROUND_HALF_UP)
+            .setScale(XMR_DECIMALS, BigDecimal.ROUND_HALF_UP)
-                .stripTrailingZeros();
+            .stripTrailingZeros()
-        if (d.scale() < 1)
+        if (d.scale() < 1) d = d.setScale(1, BigDecimal.ROUND_UNNECESSARY)
-            d = d.setScale(1, BigDecimal.ROUND_UNNECESSARY);
+        return d.toPlainString()
-        return d.toPlainString();
     }
 
-    static public Bitmap getBitmap(Context context, int drawableId) {
+    fun getBitmap(context: Context, drawableId: Int): Bitmap {
-        Drawable drawable = ContextCompat.getDrawable(context, drawableId);
+        val drawable = ContextCompat.getDrawable(context, drawableId)
-        if (drawable instanceof BitmapDrawable) {
+        return if (drawable is BitmapDrawable) {
-            return BitmapFactory.decodeResource(context.getResources(), drawableId);
+            BitmapFactory.decodeResource(context.resources, drawableId)
-        } else if (drawable instanceof VectorDrawable) {
+        } else if (drawable is VectorDrawable) {
-            return getBitmap((VectorDrawable) drawable);
+            getBitmap(drawable)
         } else {
-            throw new IllegalArgumentException("unsupported drawable type");
+            throw IllegalArgumentException("unsupported drawable type")
         }
     }
 
-    static private Bitmap getBitmap(VectorDrawable vectorDrawable) {
+    private fun getBitmap(vectorDrawable: VectorDrawable): Bitmap {
-        Bitmap bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(),
+        val bitmap = Bitmap.createBitmap(
-                vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
+            vectorDrawable.intrinsicWidth,
-        Canvas canvas = new Canvas(bitmap);
+            vectorDrawable.intrinsicHeight, Bitmap.Config.ARGB_8888
-        vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+        )
-        vectorDrawable.draw(canvas);
+        val canvas = Canvas(bitmap)
-        return bitmap;
+        vectorDrawable.setBounds(0, 0, canvas.width, canvas.height)
+        vectorDrawable.draw(canvas)
+        return bitmap
     }
 
-    static public String getUrl(String httpsUrl) {
+    fun getUrl(httpsUrl: String?): String? {
-        HttpsURLConnection urlConnection = null;
+        var urlConnection: HttpsURLConnection? = null
         try {
-            URL url = new URL(httpsUrl);
+            val url = URL(httpsUrl)
-            urlConnection = (HttpsURLConnection) url.openConnection();
+            urlConnection = url.openConnection() as HttpsURLConnection
-            urlConnection.setConnectTimeout(HTTP_TIMEOUT);
+            urlConnection.connectTimeout = HTTP_TIMEOUT
-            urlConnection.setReadTimeout(HTTP_TIMEOUT);
+            urlConnection.readTimeout = HTTP_TIMEOUT
-            InputStreamReader in = new InputStreamReader(urlConnection.getInputStream());
+            val `in` = InputStreamReader(urlConnection.inputStream)
-            StringBuffer sb = new StringBuffer();
+            val sb = StringBuffer()
-            final int BUFFER_SIZE = 512;
+            val BUFFER_SIZE = 512
-            char[] buffer = new char[BUFFER_SIZE];
+            val buffer = CharArray(BUFFER_SIZE)
-            int length = in.read(buffer, 0, BUFFER_SIZE);
+            var length = `in`.read(buffer, 0, BUFFER_SIZE)
             while (length >= 0) {
-                sb.append(buffer, 0, length);
+                sb.append(buffer, 0, length)
-                length = in.read(buffer, 0, BUFFER_SIZE);
+                length = `in`.read(buffer, 0, BUFFER_SIZE)
             }
-            return sb.toString();
+            return sb.toString()
-        } catch (SocketTimeoutException ex) {
+        } catch (ex: SocketTimeoutException) {
-            Timber.w("C %s", ex.getLocalizedMessage());
+            Timber.w("C %s", ex.localizedMessage)
-        } catch (MalformedURLException ex) {
+        } catch (ex: MalformedURLException) {
-            Timber.e("A %s", ex.getLocalizedMessage());
+            Timber.e("A %s", ex.localizedMessage)
-        } catch (IOException ex) {
+        } catch (ex: IOException) {
-            Timber.e("B %s", ex.getLocalizedMessage());
+            Timber.e("B %s", ex.localizedMessage)
         } finally {
-            if (urlConnection != null) {
+            urlConnection?.disconnect()
-                urlConnection.disconnect();
-            }
         }
-        return null;
+        return null
     }
 
-    static public void clipBoardCopy(Context context, String label, String text) {
+    @JvmStatic
+    fun clipBoardCopy(context: Context?, label: String?, text: String?) {
         if (context != null) {
-            ClipboardManager clipboardManager = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+            val clipboardManager =
-            ClipData clip = ClipData.newPlainText(label, text);
+                context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
-            clipboardManager.setPrimaryClip(clip);
+            val clip = ClipData.newPlainText(label, text)
-            Toast.makeText(context, context.getText(R.string.copied_to_clipboard), Toast.LENGTH_SHORT).show();
+            clipboardManager.setPrimaryClip(clip)
+            Toast.makeText(
+                context,
+                context.getText(R.string.copied_to_clipboard),
+                Toast.LENGTH_SHORT
+            ).show()
         }
     }
 
-    static public String getClipBoardText(Context context) {
+    @JvmStatic
-        final ClipboardManager clipboardManager = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+    fun getClipBoardText(context: Context): String? {
+        val clipboardManager =
+            context.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
         try {
             if (clipboardManager.hasPrimaryClip()
-                    && clipboardManager.getPrimaryClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
+                && clipboardManager.primaryClipDescription?.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN) == true
-                final ClipData.Item item = clipboardManager.getPrimaryClip().getItemAt(0);
+            ) {
-                return item.getText().toString();
+                val item = clipboardManager.primaryClip?.getItemAt(0)
+                return item?.text.toString()
             }
-        } catch (NullPointerException ex) {
+        } catch (ex: NullPointerException) {
             // if we have don't find a text in the clipboard
-            return null;
+            return null
         }
-        return null;
+        return null
     }
 
-    static public Animation getShakeAnimation(Context context) {
+    fun getShakeAnimation(context: Context?): Animation? {
         if (ShakeAnimation == null) {
-            synchronized (Helper.class) {
+            synchronized(Helper::class.java) {
                 if (ShakeAnimation == null) {
-                    ShakeAnimation = AnimationUtils.loadAnimation(context, R.anim.shake);
+                    ShakeAnimation = AnimationUtils.loadAnimation(context, R.anim.shake)
                 }
             }
         }
-        return ShakeAnimation;
+        return ShakeAnimation
-    }
-
-    public static String bytesToHex(byte[] data) {
-        if ((data != null) && (data.length > 0))
-            return String.format("%0" + (data.length * 2) + "X", new BigInteger(1, data));
-        else return "";
-    }
-
-    public static byte[] hexToBytes(String hex) {
-        final int len = hex.length();
-        final byte[] data = new byte[len / 2];
-        for (int i = 0; i < len; i += 2) {
-            data[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4)
-                    + Character.digit(hex.charAt(i + 1), 16));
-        }
-        return data;
     }
 
     // TODO make the log levels refer to the  WalletManagerFactory::LogLevel enum ?
-    static public void initLogger(Context context, int level) {
+    fun initLogger(context: Context, level: Int) {
-        String home = getStorage(context, MONERO_DIR).getAbsolutePath();
+        val home = getStorage(context, MONERO_DIR).absolutePath
-        WalletManager.initLogger(home + "/monerujo", "monerujo.log");
+        initLogger("$home/monerujo", "monerujo.log")
-        if (level >= WalletManager.LOGLEVEL_SILENT)
+        if (level >= WalletManager.LOGLEVEL_SILENT) setLogLevel(level)
-            WalletManager.setLogLevel(level);
     }
-}
+}

app/src/main/java/net/mynero/wallet/util/KeyStoreHelper.java

@@ -1,270 +0,0 @@
-/*
- * Copyright 2018 m2049r
- * Copyright 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package net.mynero.wallet.util;
-
-import android.annotation.TargetApi;
-import android.content.Context;
-import android.content.SharedPreferences;
-import android.os.Build;
-import android.security.KeyPairGeneratorSpec;
-import android.security.keystore.KeyGenParameterSpec;
-import android.security.keystore.KeyProperties;
-import android.util.Base64;
-
-import androidx.annotation.NonNull;
-
-import java.io.IOException;
-import java.math.BigInteger;
-import java.nio.charset.StandardCharsets;
-import java.security.InvalidAlgorithmParameterException;
-import java.security.InvalidKeyException;
-import java.security.KeyPair;
-import java.security.KeyPairGenerator;
-import java.security.KeyStore;
-import java.security.KeyStoreException;
-import java.security.NoSuchAlgorithmException;
-import java.security.NoSuchProviderException;
-import java.security.PrivateKey;
-import java.security.PublicKey;
-import java.security.Signature;
-import java.security.SignatureException;
-import java.security.UnrecoverableEntryException;
-import java.security.cert.CertificateException;
-import java.util.Calendar;
-import java.util.GregorianCalendar;
-
-import javax.crypto.BadPaddingException;
-import javax.crypto.Cipher;
-import javax.crypto.IllegalBlockSizeException;
-import javax.crypto.NoSuchPaddingException;
-import javax.security.auth.x500.X500Principal;
-
-import timber.log.Timber;
-
-public class KeyStoreHelper {
-
-    static {
-        System.loadLibrary("monerujo");
-    }
-
-    public static boolean saveWalletUserPass(@NonNull Context context, String wallet, String password) {
-        String walletKeyAlias = SecurityConstants.WALLET_PASS_KEY_PREFIX + wallet;
-        byte[] data = password.getBytes(StandardCharsets.UTF_8);
-        try {
-            KeyStoreHelper.createKeys(context, walletKeyAlias);
-            byte[] encrypted = KeyStoreHelper.encrypt(walletKeyAlias, data);
-            SharedPreferences.Editor e = context.getSharedPreferences(SecurityConstants.WALLET_PASS_PREFS_NAME, Context.MODE_PRIVATE).edit();
-            if (encrypted == null) {
-                e.remove(wallet).apply();
-                return false;
-            }
-            e.putString(wallet, Base64.encodeToString(encrypted, Base64.DEFAULT)).apply();
-            return true;
-        } catch (NoSuchProviderException | NoSuchAlgorithmException |
-                InvalidAlgorithmParameterException | KeyStoreException ex) {
-            Timber.w(ex);
-            return false;
-        }
-    }
-
-    /**
-     * Creates a public and private key and stores it using the Android Key
-     * Store, so that only this application will be able to access the keys.
-     */
-    private static void createKeys(Context context, String alias) throws NoSuchProviderException,
-            NoSuchAlgorithmException, InvalidAlgorithmParameterException, KeyStoreException {
-        KeyStore keyStore = KeyStore.getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-        try {
-            keyStore.load(null);
-        } catch (IOException | CertificateException ex) {
-            throw new IllegalStateException("Could not load KeySotre", ex);
-        }
-        if (!keyStore.containsAlias(alias)) {
-            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
-                createKeysJBMR2(context, alias);
-            } else {
-                createKeysM(alias);
-            }
-        }
-    }
-
-    private static boolean deleteKeys(String alias) throws KeyStoreException {
-        KeyStore keyStore = KeyStore.getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-        try {
-            keyStore.load(null);
-            keyStore.deleteEntry(alias);
-            return true;
-        } catch (IOException | NoSuchAlgorithmException | CertificateException ex) {
-            Timber.w(ex);
-            return false;
-        }
-    }
-
-    public static boolean keyExists(String wallet) throws BrokenPasswordStoreException {
-        try {
-            KeyStore keyStore = KeyStore.getInstance(KeyStoreHelper.SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-            keyStore.load(null);
-            return keyStore.containsAlias(KeyStoreHelper.SecurityConstants.WALLET_PASS_KEY_PREFIX + wallet);
-        } catch (IOException | NoSuchAlgorithmException | CertificateException | KeyStoreException ex) {
-            throw new BrokenPasswordStoreException(ex);
-        }
-    }
-
-    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
-    private static void createKeysJBMR2(Context context, String alias) throws NoSuchProviderException,
-            NoSuchAlgorithmException, InvalidAlgorithmParameterException {
-
-        Calendar start = new GregorianCalendar();
-        Calendar end = new GregorianCalendar();
-        end.add(Calendar.YEAR, 300);
-
-        KeyPairGeneratorSpec spec = new KeyPairGeneratorSpec.Builder(context)
-                .setAlias(alias)
-                .setSubject(new X500Principal("CN=" + alias))
-                .setSerialNumber(BigInteger.valueOf(Math.abs(alias.hashCode())))
-                .setStartDate(start.getTime()).setEndDate(end.getTime())
-                .build();
-        // defaults to 2048 bit modulus
-        KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance(
-                SecurityConstants.TYPE_RSA,
-                SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-        kpGenerator.initialize(spec);
-        KeyPair kp = kpGenerator.generateKeyPair();
-        Timber.d("preM Keys created");
-    }
-
-    @TargetApi(Build.VERSION_CODES.M)
-    private static void createKeysM(String alias) throws NoSuchProviderException,
-            NoSuchAlgorithmException, InvalidAlgorithmParameterException {
-        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(
-                KeyProperties.KEY_ALGORITHM_RSA, SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-        keyPairGenerator.initialize(
-                new KeyGenParameterSpec.Builder(
-                        alias, KeyProperties.PURPOSE_SIGN | KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
-                        .setDigests(KeyProperties.DIGEST_SHA256)
-                        .setSignaturePaddings(KeyProperties.SIGNATURE_PADDING_RSA_PKCS1)
-                        .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA_PKCS1)
-                        .build());
-        KeyPair keyPair = keyPairGenerator.generateKeyPair();
-        Timber.d("M Keys created");
-    }
-
-    private static PrivateKey getPrivateKey(String alias) {
-        try {
-            KeyStore ks = KeyStore
-                    .getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-            ks.load(null);
-            //KeyStore.Entry entry = ks.getEntry(alias, null);
-            PrivateKey privateKey = (PrivateKey) ks.getKey(alias, null);
-
-            if (privateKey == null) {
-                Timber.w("No key found under alias: %s", alias);
-                return null;
-            }
-
-            return privateKey;
-        } catch (IOException | NoSuchAlgorithmException | CertificateException
-                | UnrecoverableEntryException | KeyStoreException ex) {
-            throw new IllegalStateException(ex);
-        }
-    }
-
-    private static PublicKey getPublicKey(String alias) {
-        try {
-            KeyStore ks = KeyStore
-                    .getInstance(SecurityConstants.KEYSTORE_PROVIDER_ANDROID_KEYSTORE);
-            ks.load(null);
-
-            PublicKey publicKey = ks.getCertificate(alias).getPublicKey();
-
-            if (publicKey == null) {
-                Timber.w("No public key");
-                return null;
-            }
-            return publicKey;
-        } catch (IOException | NoSuchAlgorithmException | CertificateException
-                | KeyStoreException ex) {
-            throw new IllegalStateException(ex);
-        }
-    }
-
-    private static byte[] encrypt(String alias, byte[] data) {
-        try {
-            PublicKey publicKey = getPublicKey(alias);
-            Cipher cipher = Cipher.getInstance(SecurityConstants.CIPHER_RSA_ECB_PKCS1);
-
-            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
-            return cipher.doFinal(data);
-        } catch (InvalidKeyException | IllegalBlockSizeException | BadPaddingException
-                | NoSuchAlgorithmException | NoSuchPaddingException ex) {
-            Timber.e(ex);
-            return null;
-        }
-    }
-
-    private static byte[] decrypt(String alias, byte[] data) {
-        try {
-            PrivateKey privateKey = getPrivateKey(alias);
-            if (privateKey == null) return null;
-            Cipher cipher = Cipher.getInstance(SecurityConstants.CIPHER_RSA_ECB_PKCS1);
-
-            cipher.init(Cipher.DECRYPT_MODE, privateKey);
-            return cipher.doFinal(data);
-        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException |
-                IllegalBlockSizeException | BadPaddingException ex) {
-            Timber.e(ex);
-            return null;
-        }
-    }
-
-    /**
-     * Signs the data using the key pair stored in the Android Key Store. This
-     * signature can be used with the data later to verify it was signed by this
-     * application.
-     *
-     * @return The data signature generated
-     */
-    private static byte[] signData(String alias, byte[] data) throws NoSuchAlgorithmException,
-            InvalidKeyException, SignatureException {
-        PrivateKey privateKey = getPrivateKey(alias);
-        if (privateKey == null) return null;
-        Signature s = Signature.getInstance(SecurityConstants.SIGNATURE_SHA256withRSA);
-        s.initSign(privateKey);
-        s.update(data);
-        return s.sign();
-    }
-
-    public interface SecurityConstants {
-        String KEYSTORE_PROVIDER_ANDROID_KEYSTORE = "AndroidKeyStore";
-        String TYPE_RSA = "RSA";
-        String SIGNATURE_SHA256withRSA = "SHA256withRSA";
-        String CIPHER_RSA_ECB_PKCS1 = "RSA/ECB/PKCS1Padding";
-        String WALLET_PASS_PREFS_NAME = "wallet";
-        String WALLET_PASS_KEY_PREFIX = "walletKey-";
-    }
-
-    static public class BrokenPasswordStoreException extends Exception {
-        BrokenPasswordStoreException() {
-            super();
-        }
-
-        BrokenPasswordStoreException(Throwable cause) {
-            super(cause);
-        }
-    }
-}

app/src/main/java/net/mynero/wallet/util/MoneroThreadPoolExecutor.kt

@@ -13,41 +13,43 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import net.mynero.wallet.service.MoneroHandlerThread
+import java.util.concurrent.BlockingQueue
+import java.util.concurrent.Executor
+import java.util.concurrent.LinkedBlockingQueue
+import java.util.concurrent.ThreadFactory
+import java.util.concurrent.ThreadPoolExecutor
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicInteger
 
-import net.mynero.wallet.service.MoneroHandlerThread;
+object MoneroThreadPoolExecutor {
-
+    @JvmField
-import java.util.concurrent.BlockingQueue;
+    var MONERO_THREAD_POOL_EXECUTOR: Executor? = null
-import java.util.concurrent.Executor;
+    private val CPU_COUNT = Runtime.getRuntime().availableProcessors()
-import java.util.concurrent.LinkedBlockingQueue;
+    private val CORE_POOL_SIZE = Math.max(2, Math.min(CPU_COUNT - 1, 4))
-import java.util.concurrent.ThreadFactory;
+    private val MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1
-import java.util.concurrent.ThreadPoolExecutor;
+    private const val KEEP_ALIVE_SECONDS = 30
-import java.util.concurrent.TimeUnit;
+    private val sThreadFactory: ThreadFactory = object : ThreadFactory {
-import java.util.concurrent.atomic.AtomicInteger;
+        private val mCount = AtomicInteger(1)
-
+        override fun newThread(r: Runnable): Thread {
-
+            return Thread(
-public class MoneroThreadPoolExecutor {
+                null,
-    public static final Executor MONERO_THREAD_POOL_EXECUTOR;
+                r,
-    private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
+                "MoneroTask #" + mCount.getAndIncrement(),
-    private static final int CORE_POOL_SIZE = Math.max(2, Math.min(CPU_COUNT - 1, 4));
+                MoneroHandlerThread.THREAD_STACK_SIZE
-    private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
+            )
-    private static final int KEEP_ALIVE_SECONDS = 30;
-    private static final ThreadFactory sThreadFactory = new ThreadFactory() {
-        private final AtomicInteger mCount = new AtomicInteger(1);
-
-        public Thread newThread(Runnable r) {
-            return new Thread(null, r, "MoneroTask #" + mCount.getAndIncrement(), MoneroHandlerThread.THREAD_STACK_SIZE);
         }
-    };
-    private static final BlockingQueue<Runnable> sPoolWorkQueue =
-            new LinkedBlockingQueue<>(128);
-
-    static {
-        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
-                CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE_SECONDS, TimeUnit.SECONDS,
-                sPoolWorkQueue, sThreadFactory);
-        threadPoolExecutor.allowCoreThreadTimeOut(true);
-        MONERO_THREAD_POOL_EXECUTOR = threadPoolExecutor;
     }
-}
+    private val sPoolWorkQueue: BlockingQueue<Runnable> = LinkedBlockingQueue(128)
+
+    init {
+        val threadPoolExecutor = ThreadPoolExecutor(
+            CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE_SECONDS.toLong(), TimeUnit.SECONDS,
+            sPoolWorkQueue, sThreadFactory
+        )
+        threadPoolExecutor.allowCoreThreadTimeOut(true)
+        MONERO_THREAD_POOL_EXECUTOR = threadPoolExecutor
+    }
+}

app/src/main/java/net/mynero/wallet/util/NightmodeHelper.kt

@@ -13,22 +13,19 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import android.annotation.SuppressLint
+import androidx.appcompat.app.AppCompatDelegate
 
-import android.annotation.SuppressLint;
+object NightmodeHelper {
-
+    val preferredNightmode: Unit
-import androidx.appcompat.app.AppCompatDelegate;
+        get() {
-
+            setNightMode(DayNightMode.NIGHT)
-import net.mynero.wallet.service.PrefService;
+        }
-
-public class NightmodeHelper {
-    public static void getAndSetPreferredNightmode() {
-        setNightMode(DayNightMode.NIGHT);
-    }
 
     @SuppressLint("WrongConstant")
-    public static void setNightMode(DayNightMode mode) {
+    fun setNightMode(mode: DayNightMode) {
-        AppCompatDelegate.setDefaultNightMode(mode.getNightMode());
+        AppCompatDelegate.setDefaultNightMode(mode.nightMode)
     }
-}
+}

app/src/main/java/net/mynero/wallet/util/OnionHelper.kt

@@ -13,16 +13,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+object OnionHelper {
-
+    fun isOnionHost(hostname: String): Boolean {
-public class OnionHelper {
+        return hostname.endsWith(".onion")
-
-    public static boolean isOnionHost(String hostname) {
-        return hostname.endsWith(".onion");
     }
 
-    public static boolean isI2PHost(String hostname) {
+    fun isI2PHost(hostname: String): Boolean {
-        return hostname.endsWith(".i2p");
+        return hostname.endsWith(".i2p")
     }
-}
+}

app/src/main/java/net/mynero/wallet/util/RestoreHeight.kt

@@ -13,198 +13,198 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.Date
+import java.util.TimeZone
+import java.util.concurrent.TimeUnit
 
-import java.text.ParseException;
+class RestoreHeight internal constructor() {
-import java.text.SimpleDateFormat;
+    private val blockheight: MutableMap<String, Long> = HashMap()
-import java.util.Calendar;
-import java.util.Date;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.TimeZone;
-import java.util.concurrent.TimeUnit;
 
-public class RestoreHeight {
+    init {
-    static final int DIFFICULTY_TARGET = 120; // seconds
+        blockheight["2014-05-01"] = 18844L
-
+        blockheight["2014-06-01"] = 65406L
-    static private RestoreHeight Singleton = null;
+        blockheight["2014-07-01"] = 108882L
-    private final Map<String, Long> blockheight = new HashMap<>();
+        blockheight["2014-08-01"] = 153594L
-
+        blockheight["2014-09-01"] = 198072L
-    RestoreHeight() {
+        blockheight["2014-10-01"] = 241088L
-        blockheight.put("2014-05-01", 18844L);
+        blockheight["2014-11-01"] = 285305L
-        blockheight.put("2014-06-01", 65406L);
+        blockheight["2014-12-01"] = 328069L
-        blockheight.put("2014-07-01", 108882L);
+        blockheight["2015-01-01"] = 372369L
-        blockheight.put("2014-08-01", 153594L);
+        blockheight["2015-02-01"] = 416505L
-        blockheight.put("2014-09-01", 198072L);
+        blockheight["2015-03-01"] = 456631L
-        blockheight.put("2014-10-01", 241088L);
+        blockheight["2015-04-01"] = 501084L
-        blockheight.put("2014-11-01", 285305L);
+        blockheight["2015-05-01"] = 543973L
-        blockheight.put("2014-12-01", 328069L);
+        blockheight["2015-06-01"] = 588326L
-        blockheight.put("2015-01-01", 372369L);
+        blockheight["2015-07-01"] = 631187L
-        blockheight.put("2015-02-01", 416505L);
+        blockheight["2015-08-01"] = 675484L
-        blockheight.put("2015-03-01", 456631L);
+        blockheight["2015-09-01"] = 719725L
-        blockheight.put("2015-04-01", 501084L);
+        blockheight["2015-10-01"] = 762463L
-        blockheight.put("2015-05-01", 543973L);
+        blockheight["2015-11-01"] = 806528L
-        blockheight.put("2015-06-01", 588326L);
+        blockheight["2015-12-01"] = 849041L
-        blockheight.put("2015-07-01", 631187L);
+        blockheight["2016-01-01"] = 892866L
-        blockheight.put("2015-08-01", 675484L);
+        blockheight["2016-02-01"] = 936736L
-        blockheight.put("2015-09-01", 719725L);
+        blockheight["2016-03-01"] = 977691L
-        blockheight.put("2015-10-01", 762463L);
+        blockheight["2016-04-01"] = 1015848L
-        blockheight.put("2015-11-01", 806528L);
+        blockheight["2016-05-01"] = 1037417L
-        blockheight.put("2015-12-01", 849041L);
+        blockheight["2016-06-01"] = 1059651L
-        blockheight.put("2016-01-01", 892866L);
+        blockheight["2016-07-01"] = 1081269L
-        blockheight.put("2016-02-01", 936736L);
+        blockheight["2016-08-01"] = 1103630L
-        blockheight.put("2016-03-01", 977691L);
+        blockheight["2016-09-01"] = 1125983L
-        blockheight.put("2016-04-01", 1015848L);
+        blockheight["2016-10-01"] = 1147617L
-        blockheight.put("2016-05-01", 1037417L);
+        blockheight["2016-11-01"] = 1169779L
-        blockheight.put("2016-06-01", 1059651L);
+        blockheight["2016-12-01"] = 1191402L
-        blockheight.put("2016-07-01", 1081269L);
+        blockheight["2017-01-01"] = 1213861L
-        blockheight.put("2016-08-01", 1103630L);
+        blockheight["2017-02-01"] = 1236197L
-        blockheight.put("2016-09-01", 1125983L);
+        blockheight["2017-03-01"] = 1256358L
-        blockheight.put("2016-10-01", 1147617L);
+        blockheight["2017-04-01"] = 1278622L
-        blockheight.put("2016-11-01", 1169779L);
+        blockheight["2017-05-01"] = 1300239L
-        blockheight.put("2016-12-01", 1191402L);
+        blockheight["2017-06-01"] = 1322564L
-        blockheight.put("2017-01-01", 1213861L);
+        blockheight["2017-07-01"] = 1344225L
-        blockheight.put("2017-02-01", 1236197L);
+        blockheight["2017-08-01"] = 1366664L
-        blockheight.put("2017-03-01", 1256358L);
+        blockheight["2017-09-01"] = 1389113L
-        blockheight.put("2017-04-01", 1278622L);
+        blockheight["2017-10-01"] = 1410738L
-        blockheight.put("2017-05-01", 1300239L);
+        blockheight["2017-11-01"] = 1433039L
-        blockheight.put("2017-06-01", 1322564L);
+        blockheight["2017-12-01"] = 1454639L
-        blockheight.put("2017-07-01", 1344225L);
+        blockheight["2018-01-01"] = 1477201L
-        blockheight.put("2017-08-01", 1366664L);
+        blockheight["2018-02-01"] = 1499599L
-        blockheight.put("2017-09-01", 1389113L);
+        blockheight["2018-03-01"] = 1519796L
-        blockheight.put("2017-10-01", 1410738L);
+        blockheight["2018-04-01"] = 1542067L
-        blockheight.put("2017-11-01", 1433039L);
+        blockheight["2018-05-01"] = 1562861L
-        blockheight.put("2017-12-01", 1454639L);
+        blockheight["2018-06-01"] = 1585135L
-        blockheight.put("2018-01-01", 1477201L);
+        blockheight["2018-07-01"] = 1606715L
-        blockheight.put("2018-02-01", 1499599L);
+        blockheight["2018-08-01"] = 1629017L
-        blockheight.put("2018-03-01", 1519796L);
+        blockheight["2018-09-01"] = 1651347L
-        blockheight.put("2018-04-01", 1542067L);
+        blockheight["2018-10-01"] = 1673031L
-        blockheight.put("2018-05-01", 1562861L);
+        blockheight["2018-11-01"] = 1695128L
-        blockheight.put("2018-06-01", 1585135L);
+        blockheight["2018-12-01"] = 1716687L
-        blockheight.put("2018-07-01", 1606715L);
+        blockheight["2019-01-01"] = 1738923L
-        blockheight.put("2018-08-01", 1629017L);
+        blockheight["2019-02-01"] = 1761435L
-        blockheight.put("2018-09-01", 1651347L);
+        blockheight["2019-03-01"] = 1781681L
-        blockheight.put("2018-10-01", 1673031L);
+        blockheight["2019-04-01"] = 1803081L
-        blockheight.put("2018-11-01", 1695128L);
+        blockheight["2019-05-01"] = 1824671L
-        blockheight.put("2018-12-01", 1716687L);
+        blockheight["2019-06-01"] = 1847005L
-        blockheight.put("2019-01-01", 1738923L);
+        blockheight["2019-07-01"] = 1868590L
-        blockheight.put("2019-02-01", 1761435L);
+        blockheight["2019-08-01"] = 1890878L
-        blockheight.put("2019-03-01", 1781681L);
+        blockheight["2019-09-01"] = 1913201L
-        blockheight.put("2019-04-01", 1803081L);
+        blockheight["2019-10-01"] = 1934732L
-        blockheight.put("2019-05-01", 1824671L);
+        blockheight["2019-11-01"] = 1957051L
-        blockheight.put("2019-06-01", 1847005L);
+        blockheight["2019-12-01"] = 1978433L
-        blockheight.put("2019-07-01", 1868590L);
+        blockheight["2020-01-01"] = 2001315L
-        blockheight.put("2019-08-01", 1890878L);
+        blockheight["2020-02-01"] = 2023656L
-        blockheight.put("2019-09-01", 1913201L);
+        blockheight["2020-03-01"] = 2044552L
-        blockheight.put("2019-10-01", 1934732L);
+        blockheight["2020-04-01"] = 2066806L
-        blockheight.put("2019-11-01", 1957051L);
+        blockheight["2020-05-01"] = 2088411L
-        blockheight.put("2019-12-01", 1978433L);
+        blockheight["2020-06-01"] = 2110702L
-        blockheight.put("2020-01-01", 2001315L);
+        blockheight["2020-07-01"] = 2132318L
-        blockheight.put("2020-02-01", 2023656L);
+        blockheight["2020-08-01"] = 2154590L
-        blockheight.put("2020-03-01", 2044552L);
+        blockheight["2020-09-01"] = 2176790L
-        blockheight.put("2020-04-01", 2066806L);
+        blockheight["2020-10-01"] = 2198370L
-        blockheight.put("2020-05-01", 2088411L);
+        blockheight["2020-11-01"] = 2220670L
-        blockheight.put("2020-06-01", 2110702L);
+        blockheight["2020-12-01"] = 2242241L
-        blockheight.put("2020-07-01", 2132318L);
+        blockheight["2021-01-01"] = 2264584L
-        blockheight.put("2020-08-01", 2154590L);
+        blockheight["2021-02-01"] = 2286892L
-        blockheight.put("2020-09-01", 2176790L);
+        blockheight["2021-03-01"] = 2307079L
-        blockheight.put("2020-10-01", 2198370L);
+        blockheight["2021-04-01"] = 2329385L
-        blockheight.put("2020-11-01", 2220670L);
+        blockheight["2021-05-01"] = 2351004L
-        blockheight.put("2020-12-01", 2242241L);
+        blockheight["2021-06-01"] = 2373306L
-        blockheight.put("2021-01-01", 2264584L);
+        blockheight["2021-07-01"] = 2394882L
-        blockheight.put("2021-02-01", 2286892L);
+        blockheight["2021-08-01"] = 2417162L
-        blockheight.put("2021-03-01", 2307079L);
+        blockheight["2021-09-01"] = 2439490L
-        blockheight.put("2021-04-01", 2329385L);
+        blockheight["2021-10-01"] = 2461020L
-        blockheight.put("2021-05-01", 2351004L);
+        blockheight["2021-11-01"] = 2483377L
-        blockheight.put("2021-06-01", 2373306L);
+        blockheight["2021-12-01"] = 2504932L
-        blockheight.put("2021-07-01", 2394882L);
+        blockheight["2022-01-01"] = 2527316L
-        blockheight.put("2021-08-01", 2417162L);
+        blockheight["2022-02-01"] = 2549605L
-        blockheight.put("2021-09-01", 2439490L);
+        blockheight["2022-03-01"] = 2569711L
-        blockheight.put("2021-10-01", 2461020L);
-        blockheight.put("2021-11-01", 2483377L);
-        blockheight.put("2021-12-01", 2504932L);
-        blockheight.put("2022-01-01", 2527316L);
-        blockheight.put("2022-02-01", 2549605L);
-        blockheight.put("2022-03-01", 2569711L);
     }
 
-    static public RestoreHeight getInstance() {
+    fun getHeight(date: String?): Long {
-        if (Singleton == null) {
+        val parser = SimpleDateFormat("yyyy-MM-dd")
-            synchronized (RestoreHeight.class) {
+        parser.timeZone = TimeZone.getTimeZone("UTC")
-                if (Singleton == null) {
+        parser.isLenient = false
-                    Singleton = new RestoreHeight();
+        return try {
-                }
+            getHeight(parser.parse(date))
-            }
+        } catch (ex: ParseException) {
-        }
+            throw IllegalArgumentException(ex)
-        return Singleton;
-    }
-
-    public long getHeight(String date) {
-        SimpleDateFormat parser = new SimpleDateFormat("yyyy-MM-dd");
-        parser.setTimeZone(TimeZone.getTimeZone("UTC"));
-        parser.setLenient(false);
-        try {
-            return getHeight(parser.parse(date));
-        } catch (ParseException ex) {
-            throw new IllegalArgumentException(ex);
         }
     }
 
-    public long getHeight(final Date date) {
+    fun getHeight(date: Date?): Long {
-        Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
+        val cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
-        cal.set(Calendar.DST_OFFSET, 0);
+        cal[Calendar.DST_OFFSET] = 0
-        cal.setTime(date);
+        cal.time = date
-        cal.add(Calendar.DAY_OF_MONTH, -4); // give it some leeway
+        cal.add(Calendar.DAY_OF_MONTH, -4) // give it some leeway
-        if (cal.get(Calendar.YEAR) < 2014)
+        if (cal[Calendar.YEAR] < 2014) return 0
-            return 0;
+        if (cal[Calendar.YEAR] == 2014 && cal[Calendar.MONTH] <= 3) // before May 2014
-        if ((cal.get(Calendar.YEAR) == 2014) && (cal.get(Calendar.MONTH) <= 3))
+            return 0
-            // before May 2014
+        val query = cal.clone() as Calendar
-            return 0;
+        val formatter = SimpleDateFormat("yyyy-MM-dd")
-
+        formatter.timeZone = TimeZone.getTimeZone("UTC")
-        Calendar query = (Calendar) cal.clone();
+        val queryDate = formatter.format(date)
-
+        cal[Calendar.DAY_OF_MONTH] = 1
-        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
+        var prevTime = cal.timeInMillis
-        formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
+        var prevDate = formatter.format(prevTime)
-
-        String queryDate = formatter.format(date);
-
-        cal.set(Calendar.DAY_OF_MONTH, 1);
-        long prevTime = cal.getTimeInMillis();
-        String prevDate = formatter.format(prevTime);
         // lookup blockheight at first of the month
-        Long prevBc = blockheight.get(prevDate);
+        var prevBc = blockheight[prevDate]
         if (prevBc == null) {
             // if too recent, go back in time and find latest one we have
             while (prevBc == null) {
-                cal.add(Calendar.MONTH, -1);
+                cal.add(Calendar.MONTH, -1)
-                if (cal.get(Calendar.YEAR) < 2014) {
+                check(cal[Calendar.YEAR] >= 2014) { "endless loop looking for blockheight" }
-                    throw new IllegalStateException("endless loop looking for blockheight");
+                prevTime = cal.timeInMillis
-                }
+                prevDate = formatter.format(prevTime)
-                prevTime = cal.getTimeInMillis();
+                prevBc = blockheight[prevDate]
-                prevDate = formatter.format(prevTime);
-                prevBc = blockheight.get(prevDate);
             }
         }
-        long height = prevBc;
+        var height: Long = prevBc
         // now we have a blockheight & a date ON or BEFORE the restore date requested
-        if (queryDate.equals(prevDate)) return height;
+        if (queryDate == prevDate) return height
         // see if we have a blockheight after this date
-        cal.add(Calendar.MONTH, 1);
+        cal.add(Calendar.MONTH, 1)
-        long nextTime = cal.getTimeInMillis();
+        val nextTime = cal.timeInMillis
-        String nextDate = formatter.format(nextTime);
+        val nextDate = formatter.format(nextTime)
-        Long nextBc = blockheight.get(nextDate);
+        val nextBc = blockheight[nextDate]
-        if (nextBc != null) { // we have a range - interpolate the blockheight we are looking for
+        height =
-            long diff = nextBc - prevBc;
+            if (nextBc != null) { // we have a range - interpolate the blockheight we are looking for
-            long diffDays = TimeUnit.DAYS.convert(nextTime - prevTime, TimeUnit.MILLISECONDS);
+                val diff = nextBc - prevBc
-            long days = TimeUnit.DAYS.convert(query.getTimeInMillis() - prevTime,
+                val diffDays = TimeUnit.DAYS.convert(
-                    TimeUnit.MILLISECONDS);
+                    nextTime - prevTime,
-            height = Math.round(prevBc + diff * (1.0 * days / diffDays));
+                    TimeUnit.MILLISECONDS
-        } else {
+                )
-            long days = TimeUnit.DAYS.convert(query.getTimeInMillis() - prevTime,
+                val days = TimeUnit.DAYS.convert(
-                    TimeUnit.MILLISECONDS);
+                    query.timeInMillis - prevTime,
-            height = Math.round(prevBc + 1.0 * days * (24f * 60 * 60 / DIFFICULTY_TARGET));
+                    TimeUnit.MILLISECONDS
-        }
+                )
-        return height;
+                Math.round(prevBc + diff * (1.0 * days / diffDays))
+            } else {
+                val days = TimeUnit.DAYS.convert(
+                    query.timeInMillis - prevTime,
+                    TimeUnit.MILLISECONDS
+                )
+                Math.round(prevBc + 1.0 * days * (24f * 60 * 60 / DIFFICULTY_TARGET))
+            }
+        return height
     }
-}
+
+    companion object {
+        const val DIFFICULTY_TARGET = 120 // seconds
+        private var Singleton: RestoreHeight? = null
+        @JvmStatic
+        val instance: RestoreHeight?
+            get() {
+                if (Singleton == null) {
+                    synchronized(RestoreHeight::class.java) {
+                        if (Singleton == null) {
+                            Singleton = RestoreHeight()
+                        }
+                    }
+                }
+                return Singleton
+            }
+    }
+}

app/src/main/java/net/mynero/wallet/util/ThemeHelper.kt

@@ -13,46 +13,46 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package net.mynero.wallet.util
 
-package net.mynero.wallet.util;
+import android.app.Activity
+import android.content.Context
+import android.graphics.Color
+import android.preference.PreferenceManager
+import android.util.TypedValue
+import androidx.annotation.ColorInt
+import net.mynero.wallet.R
 
-import android.app.Activity;
+object ThemeHelper {
-import android.content.Context;
+    fun getThemedResourceId(ctx: Context, attrId: Int): Int {
-import android.graphics.Color;
+        val typedValue = TypedValue()
-import android.preference.PreferenceManager;
+        return if (ctx.theme.resolveAttribute(
-import android.util.TypedValue;
+                attrId,
-
+                typedValue,
-import androidx.annotation.ColorInt;
+                true
-import androidx.annotation.NonNull;
+            )
-
+        ) typedValue.resourceId else 0
-import net.mynero.wallet.R;
-
-public class ThemeHelper {
-    static public int getThemedResourceId(Context ctx, int attrId) {
-        final TypedValue typedValue = new TypedValue();
-        if (ctx.getTheme().resolveAttribute(attrId, typedValue, true))
-            return typedValue.resourceId;
-        else
-            return 0;
     }
 
+    @JvmStatic
     @ColorInt
-    static public int getThemedColor(Context ctx, int attrId) {
+    fun getThemedColor(ctx: Context, attrId: Int): Int {
-        final TypedValue typedValue = new TypedValue();
+        val typedValue = TypedValue()
-        if (ctx.getTheme().resolveAttribute(attrId, typedValue, true))
+        return if (ctx.theme.resolveAttribute(
-            return typedValue.data;
+                attrId,
-        else
+                typedValue,
-            return Color.BLACK;
+                true
+            )
+        ) typedValue.data else Color.BLACK
     }
 
-    public static void setTheme(@NonNull Activity activity, @NonNull String theme) {
+    fun setTheme(activity: Activity, theme: String) {
-        activity.setTheme(R.style.MyMaterialThemeOled);
+        activity.setTheme(R.style.MyMaterialThemeOled)
     }
 
-    public static void setPreferred(Activity activity) {
+    fun setPreferred(activity: Activity) {
-        final String theme = PreferenceManager.getDefaultSharedPreferences(activity)
+        val theme = PreferenceManager.getDefaultSharedPreferences(activity)
-                .getString(activity.getString(R.string.preferred_theme), "Classic");
+            .getString(activity.getString(R.string.preferred_theme), "Classic")
-        setTheme(activity, theme);
+        theme?.let { setTheme(activity, it) }
     }
-
+}
-}

app/src/main/java/net/mynero/wallet/util/UriData.kt

@@ -1,65 +1,55 @@
-package net.mynero.wallet.util;
+package net.mynero.wallet.util
 
-import net.mynero.wallet.model.Wallet;
+import net.mynero.wallet.model.Wallet.Companion.getPaymentIdFromAddress
-import net.mynero.wallet.model.WalletManager;
+import net.mynero.wallet.model.Wallet.Companion.isAddressValid
+import net.mynero.wallet.model.WalletManager.Companion.instance
 
-import java.util.HashMap;
+class UriData(@JvmField val address: String, val params: HashMap<String, String>) {
 
-public class UriData {
+    fun hasPaymentId(): Boolean {
-    private final String address;
+        return instance?.wallet?.nettype()?.let { getPaymentIdFromAddress(address, it) }?.isNotEmpty() == true
-    private final HashMap<String, String> params;
-
-    public UriData(String address, HashMap<String, String> params) {
-        this.address = address;
-        this.params = params;
     }
 
-    public static UriData parse(String uri) {
+    val amount: String?
-        HashMap<String, String> params = new HashMap<>();
+        get() = params[Constants.URI_ARG_AMOUNT]
-        String[] uriParts = uri.replace(Constants.URI_PREFIX, "").split("\\?");
+            ?: params[Constants.URI_ARG_AMOUNT2]
-        String finalAddress = uriParts[0];
+
-        String queryParams = "";
+    fun hasAmount(): Boolean {
-        if (uriParts.length > 1) {
+        return params.containsKey(Constants.URI_ARG_AMOUNT) || params.containsKey(Constants.URI_ARG_AMOUNT2)
-            queryParams = uriParts[1];
+    }
-            String[] queryParts = queryParams.split("&");
+
-            for (String param : queryParts) {
+    companion object {
-                String[] paramParts = param.split("=");
+        @JvmStatic
-                if(paramParts.length == 2) {
+        fun parse(uri: String): UriData? {
-                    String variable = paramParts[0];
+            if(uri.isEmpty()) return null
-                    String value = paramParts[1];
+            val params = HashMap<String, String>()
-                    params.put(variable, value);
+            val uriParts = uri.replace(Constants.URI_PREFIX, "").split("\\?".toRegex())
+                .dropLastWhile { it.isEmpty() }
+                .toTypedArray()
+
+            if(uriParts.isEmpty()) return null
+            val finalAddress = uriParts[0]
+            var queryParams = ""
+            if (uriParts.size > 1) {
+                queryParams = uriParts[1]
+                val queryParts =
+                    queryParams.split("&".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+                for (param in queryParts) {
+                    val paramParts =
+                        param.split("=".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
+                    if (paramParts.size == 2) {
+                        val variable = paramParts[0]
+                        val value = paramParts[1]
+                        params[variable] = value
+                    }
                 }
             }
-        }
+            val valid = isAddressValid(finalAddress)
-        boolean valid = Wallet.isAddressValid(finalAddress);
+            return if (valid) {
-        if (valid) {
+                UriData(finalAddress, params)
-            return new UriData(finalAddress, params);
+            } else {
-        } else {
+                null
-            return null;
+            }
         }
     }
-
+}
-    public HashMap<String, String> getParams() {
-        return params;
-    }
-
-    public String getAddress() {
-        return address;
-    }
-
-    public boolean hasPaymentId() {
-        return !Wallet.getPaymentIdFromAddress(this.address, WalletManager.getInstance().getWallet().nettype()).isEmpty();
-    }
-
-    public String getAmount() {
-        String txAmount = params.get(Constants.URI_ARG_AMOUNT);
-        if (txAmount == null) {
-            return params.get(Constants.URI_ARG_AMOUNT2);
-        }
-        return txAmount;
-    }
-
-    public boolean hasAmount() {
-        return params.containsKey(Constants.URI_ARG_AMOUNT) || params.containsKey(Constants.URI_ARG_AMOUNT2);
-    }
-}

build.gradle

@@ -1,12 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
+    ext.kotlin_version = '1.9.21'
     repositories {
         mavenCentral()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.4.1'
+        classpath 'com.android.tools.build:gradle:8.1.3'
         classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.5.2"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
     }
 }

gradle.properties

@@ -18,3 +18,6 @@ org.gradle.jvmargs=-Xmx2048m
 
 android.useAndroidX=true
 android.enableJetifier=true
+android.defaults.buildfeatures.buildconfig=true
+android.nonTransitiveRClass=false
+android.nonFinalResIds=false

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 #Fri Feb 10 17:24:42 CST 2023
 distributionBase=GRADLE_USER_HOME
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME