Create an initial intro screen on first launch

app/build.gradle

@@ -25,6 +25,9 @@ android {
     lintOptions {
           abortOnError false
     }
+    dataBinding {
+        enabled = true
+    }
 }
 
 ext {
@@ -41,6 +44,7 @@ dependencies {
     compile "com.android.support:recyclerview-v7:$supportLibVersion"
     compile "com.android.support.constraint:constraint-layout:1.0.2"
     compile "com.github.aakira:expandable-layout:1.6.0"
+    compile "com.heinrichreimersoftware:material-intro:1.6.2"
     compile "com.journeyapps:zxing-android-embedded:3.5.0"
     compile "com.vanniktech:vntnumberpickerpreference:1.0.0"
     compile "de.psdev.licensesdialog:licensesdialog:1.8.3"

app/src/main/AndroidManifest.xml

@@ -35,6 +35,10 @@
             android:name=".Activities.BackupActivity"
             android:parentActivityName=".Activities.MainActivity"
             android:theme="@style/AppTheme.NoActionBar" />
+        <activity
+            android:name=".Activities.MainIntroActivity"
+            android:parentActivityName=".Activities.MainActivity"
+            android:theme="@style/Theme.Intro" />
         <activity
             android:name=".Activities.SettingsActivity"
             android:parentActivityName=".Activities.MainActivity"

app/src/main/java/org/shadowice/flocke/andotp/Activities/MainActivity.java

@@ -103,7 +103,7 @@ public class MainActivity extends BaseActivity
                 .initiateScan();
     }
 
-    private void showFirstTimeWarning() {
+    /*private void showFirstTimeWarning() {
         ViewGroup container = findViewById(R.id.main_content);
         View msgView = getLayoutInflater().inflate(R.layout.dialog_database_encryption, container, false);
 
@@ -135,6 +135,11 @@ public class MainActivity extends BaseActivity
                 })
                 .create()
                 .show();
+    }*/
+
+    private void showFirstTimeWarning() {
+        Intent introIntent = new Intent(this, MainIntroActivity.class);
+        startActivityForResult(introIntent, Constants.INTENT_MAIN_INTRO);
     }
 
     public void authenticate(int messageId) {

app/src/main/java/org/shadowice/flocke/andotp/Activities/MainIntroActivity.java

@@ -0,0 +1,140 @@
+package org.shadowice.flocke.andotp.Activities;
+
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.view.ViewPager;
+import android.util.Log;
+import android.util.SparseArray;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import com.heinrichreimersoftware.materialintro.app.IntroActivity;
+import com.heinrichreimersoftware.materialintro.app.SlideFragment;
+import com.heinrichreimersoftware.materialintro.slide.FragmentSlide;
+import com.heinrichreimersoftware.materialintro.slide.SimpleSlide;
+
+import org.shadowice.flocke.andotp.R;
+import org.shadowice.flocke.andotp.Utilities.Constants;
+import org.shadowice.flocke.andotp.Utilities.Settings;
+
+public class MainIntroActivity extends IntroActivity {
+    private Settings settings;
+
+    private EncryptionFragment encryptionFragment;
+
+    @Override protected void onCreate(Bundle savedInstanceState){
+        super.onCreate(savedInstanceState);
+
+        settings = new Settings(this);
+
+        encryptionFragment = new EncryptionFragment();
+
+        setButtonBackFunction(BUTTON_BACK_FUNCTION_BACK);
+
+        addSlide(new SimpleSlide.Builder()
+                .title(R.string.intro_slide1_title)
+                .description(R.string.intro_slide1_desc)
+                .image(R.mipmap.ic_launcher)
+                .background(R.color.colorPrimary)
+                .backgroundDark(R.color.colorPrimaryDark)
+                .canGoBackward(false)
+                .scrollable(false)
+                .build()
+        );
+
+        addSlide(new FragmentSlide.Builder()
+                .background(R.color.colorPrimary)
+                .backgroundDark(R.color.colorPrimaryDark)
+                .fragment(encryptionFragment)
+                .build()
+        );
+
+        // TODO: Set authentication
+        addSlide(new SimpleSlide.Builder()
+                .title(R.string.intro_slide1_title)
+                .description(R.string.intro_slide1_desc)
+                .image(R.mipmap.ic_launcher)
+                .background(R.color.colorPrimary)
+                .backgroundDark(R.color.colorPrimaryDark)
+                .scrollable(false)
+                .build()
+        );
+
+        addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
+            @Override
+            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+            }
+
+            @Override
+            public void onPageSelected(int position) {
+                if (position == 2) {
+                    // TODO: Inter-page communication
+                    settings.setEncryption(encryptionFragment.getSelectedEncryption());
+                    Log.d("INTRO", "Encryption saved");
+                }
+            }
+
+            @Override
+            public void onPageScrollStateChanged(int state) {
+            }
+        });
+
+    }
+
+    @Override
+    public void onBackPressed() {
+        if (getCurrentSlidePosition() != 0)
+            super.onBackPressed();
+    }
+
+    public static class EncryptionFragment extends SlideFragment {
+        private Spinner selection;
+        private TextView desc;
+
+        private SparseArray<Constants.EncryptionType> selectionMapping;
+
+        public EncryptionFragment() {
+        }
+
+        @Override
+        public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
+                                 Bundle savedInstanceState) {
+            View root = inflater.inflate(R.layout.component_intro_encryption, container, false);
+
+            selection = root.findViewById(R.id.introEncryptionSelection);
+            desc = root.findViewById(R.id.introEncryptionDesc);
+
+            final String[] encValues = getResources().getStringArray(R.array.settings_values_encryption);
+
+            selectionMapping = new SparseArray<>();
+            for (int i = 0; i < encValues.length; i++)
+                selectionMapping.put(i, Constants.EncryptionType.valueOf(encValues[i].toUpperCase()));
+
+            selection.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+                @Override
+                public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
+                    Constants.EncryptionType encryptionType = selectionMapping.get(i);
+
+                    if (encryptionType == Constants.EncryptionType.PASSWORD)
+                        desc.setText(R.string.intro_slide2_desc_password);
+                    else if (encryptionType == Constants.EncryptionType.KEYSTORE)
+                        desc.setText(R.string.intro_slide2_desc_keystore);
+                }
+
+                @Override
+                public void onNothingSelected(AdapterView<?> adapterView) {
+                }
+            });
+
+            return root;
+        }
+
+        private Constants.EncryptionType getSelectedEncryption() {
+            return selectionMapping.get(selection.getSelectedItemPosition());
+        }
+    }
+}

app/src/main/java/org/shadowice/flocke/andotp/Utilities/Constants.java

@@ -52,6 +52,7 @@ public class Constants {
     public final static int INTENT_MAIN_AUTHENTICATE            = 100;
     public final static int INTENT_MAIN_SETTINGS                = 101;
     public final static int INTENT_MAIN_BACKUP                  = 102;
+    public final static int INTENT_MAIN_INTRO                   = 103;
 
     public final static int INTENT_BACKUP_OPEN_DOCUMENT_PLAIN   = 200;
     public final static int INTENT_BACKUP_SAVE_DOCUMENT_PLAIN   = 201;

app/src/main/java/org/shadowice/flocke/andotp/Utilities/Settings.java

@@ -290,6 +290,10 @@ public class Settings {
         return EncryptionType.valueOf(encType.toUpperCase());
     }
 
+    public void setEncryption(EncryptionType encryptionType) {
+        setEncryption(encryptionType.name().toLowerCase());
+    }
+
     public void setEncryption(String encryption) {
         setString(R.string.settings_key_encryption, encryption);
     }

app/src/main/res/layout/component_intro_encryption.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_gravity="center"
+    android:gravity="center"
+    android:padding="@dimen/activity_margin_large" >
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textAppearance="@style/TextAppearance.AppCompat.Headline"
+        android:textStyle="bold"
+        android:text="@string/settings_title_encryption" />
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="@dimen/activity_margin"
+        android:text="@string/intro_slide2_desc"/>
+
+    <Spinner
+        android:id="@+id/introEncryptionSelection"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="@dimen/activity_margin_large"
+        android:layout_marginStart="@dimen/activity_margin"
+        android:layout_marginEnd="@dimen/activity_margin"
+        android:entries="@array/settings_entries_encryption" />
+
+    <TextView
+        android:id="@+id/introEncryptionDesc"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="@dimen/activity_margin_large"
+        android:text="@string/intro_slide2_desc_keystore"/>
+
+</LinearLayout>

app/src/main/res/values/strings_intro.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="intro_slide1_title">Welcome to andOTP</string>
+    <string name="intro_slide1_desc">This wizard will guide you through the initial setup.</string>
+
+    <string name="intro_slide2_desc">To ensure the security of your accounts andOTP only stores them
+        in encrypted data files. Here you can choose which method of encryption will be used:</string>
+    <string name="intro_slide2_desc_keystore">The KeyStore is a system component of Android for
+        securely storing cryptographic keys. The advantage of this method is that the keys are
+        stored separated from the data files and can be backed by hardware cryptography (if your
+        device supports it). However, as the keys are not stored with the apps data <b>this method
+        prevents external backup solutions (like Titanium) from working</b>. If you choose this
+        method you will have to rely on the internal backup functions provided by andOTP.
+        \n\n<b>Warning</b>: The KeyStore is known to cause problems on some custom ROMs (and a few
+        stock ones as well). If you don\'t mind entering a password / PIN every time you start
+        andOTP it is highly recommended to use the password-based encryption.</string>
+    <string name="intro_slide2_desc_password">This method will encrypt your data with a key
+        generated from a password or PIN. The main advantage here is that this will work with
+        external backup solutions (like Titanium). However, you will have to enter your credentials
+        every time you start andOTP.</string>
+</resources>

build.gradle

@@ -18,9 +18,8 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
-        maven {
+        maven { url "https://maven.google.com" }
-            url "https://maven.google.com"
+        maven { url "https://jitpack.io" }
-        }
     }
 }