Reduce build warnings (#712)

* Add annotations to and reformat SearchableRepositoryViewModel.kt

* Address build warnings other than meaningful deprecations

* Deal with warnings in UserPreference.kt

app/src/main/java/com/zeapo/pwdstore/PasswordStore.kt

@@ -295,7 +295,7 @@ class PasswordStore : AppCompatActivity() {
             searchItem.collapseActionView()
     }
 
-    fun openSettings(view: View?) {
+    fun openSettings(@Suppress("UNUSED_PARAMETER") view: View?) {
         val intent: Intent
         try {
             intent = Intent(this, UserPreference::class.java)
@@ -305,11 +305,11 @@ class PasswordStore : AppCompatActivity() {
         }
     }
 
-    fun cloneExistingRepository(view: View?) {
+    fun cloneExistingRepository(@Suppress("UNUSED_PARAMETER") view: View?) {
         initRepository(CLONE_REPO_BUTTON)
     }
 
-    fun createNewRepository(view: View?) {
+    fun createNewRepository(@Suppress("UNUSED_PARAMETER") view: View?) {
         initRepository(NEW_REPO_BUTTON)
     }
 
@@ -473,7 +473,7 @@ class PasswordStore : AppCompatActivity() {
         val intent = Intent(this, PgpActivity::class.java)
         intent.putExtra("NAME", item.toString())
         intent.putExtra("FILE_PATH", item.file.absolutePath)
-        intent.putExtra("PARENT_PATH", item.file.parentFile.absolutePath)
+        intent.putExtra("PARENT_PATH", item.file.parentFile!!.absolutePath)
         intent.putExtra("REPO_PATH", getRepositoryDirectory(applicationContext).absolutePath)
         intent.putExtra("OPERATION", "EDIT")
         startActivityForResult(intent, REQUEST_CODE_EDIT)

app/src/main/java/com/zeapo/pwdstore/SearchableRepositoryViewModel.kt

@@ -10,6 +10,7 @@ import android.os.Parcelable
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.annotation.VisibleForTesting
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
@@ -122,8 +123,7 @@ enum class ListMode {
     AllEntries
 }
 
-@ExperimentalCoroutinesApi
+@OptIn(ExperimentalCoroutinesApi::class, FlowPreview::class)
-@FlowPreview
 class SearchableRepositoryViewModel(application: Application) : AndroidViewModel(application) {
 
     private var _updateCounter = 0
@@ -141,10 +141,10 @@ class SearchableRepositoryViewModel(application: Application) : AndroidViewModel
         get() = settings.getBoolean("show_hidden_folders", false)
     private val defaultSearchMode
         get() = if (settings.getBoolean("filter_recursively", true)) {
-        SearchMode.RecursivelyInSubdirectories
+            SearchMode.RecursivelyInSubdirectories
-    } else {
+        } else {
-        SearchMode.InCurrentDirectoryOnly
+            SearchMode.InCurrentDirectoryOnly
-    }
+        }
 
     private val typeSortOrder
         get() = PasswordRepository.PasswordSortOrder.getSortOrder(settings)
@@ -352,6 +352,7 @@ class SearchableRepositoryViewModel(application: Application) : AndroidViewModel
 
     companion object {
 
+        @VisibleForTesting
         fun generateStrictDomainRegex(domain: String): Regex? {
             // Valid domains do not contain path separators.
             if (domain.contains('/'))
@@ -377,7 +378,8 @@ private object PasswordItemDiffCallback : DiffUtil.ItemCallback<PasswordItem>()
     override fun areItemsTheSame(oldItem: PasswordItem, newItem: PasswordItem) =
         oldItem.file.absolutePath == newItem.file.absolutePath
 
-    override fun areContentsTheSame(oldItem: PasswordItem, newItem: PasswordItem) = oldItem == newItem
+    override fun areContentsTheSame(oldItem: PasswordItem, newItem: PasswordItem) =
+        oldItem == newItem
 }
 
 open class SearchableRepositoryAdapter<T : RecyclerView.ViewHolder>(
@@ -434,6 +436,7 @@ open class SearchableRepositoryAdapter<T : RecyclerView.ViewHolder>(
 
     private val selectedFiles
         get() = requireSelectionTracker().selection.map { File(it) }
+
     fun getSelectedItems(context: Context): List<PasswordItem> {
         val root = PasswordRepository.getRepositoryDirectory(context)
         return selectedFiles.map { it.toPasswordItem(root) }

app/src/main/java/com/zeapo/pwdstore/UserPreference.kt

@@ -5,6 +5,7 @@
 package com.zeapo.pwdstore
 
 import android.accessibilityservice.AccessibilityServiceInfo
+import android.annotation.SuppressLint
 import android.app.Activity
 import android.content.Intent
 import android.content.pm.ShortcutManager
@@ -386,6 +387,7 @@ class UserPreference : AppCompatActivity() {
                 MaterialAlertDialogBuilder(callingActivity).run {
                     setTitle(R.string.pref_autofill_enable_title)
                     if (enableOreoAutofill && Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        @SuppressLint("InflateParams")
                         val layout =
                             layoutInflater.inflate(R.layout.oreo_autofill_instructions, null)
                         val supportedBrowsersTextView =
@@ -543,7 +545,7 @@ class UserPreference : AppCompatActivity() {
 
     private val isAccessibilityServiceEnabled: Boolean
         get() {
-            val am = getSystemService(AccessibilityManager::class.java)
+            val am = getSystemService(AccessibilityManager::class.java) ?: return false
             val runningServices = am
                 .getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_GENERIC)
             return runningServices

app/src/main/java/com/zeapo/pwdstore/autofill/AutofillActivity.kt

@@ -47,20 +47,23 @@ class AutofillActivity : AppCompatActivity() {
         finish() // go back to the password field app
         when (requestCode) {
             REQUEST_CODE_DECRYPT_AND_VERIFY -> if (resultCode == RESULT_OK) {
-                AutofillService.instance?.setResultData(data!!) // report the result to service
+                require(data != null)
+                AutofillService.instance?.setResultData(data) // report the result to service
             }
             REQUEST_CODE_PICK -> if (resultCode == RESULT_OK) {
-                AutofillService.instance?.setPickedPassword(data!!.getStringExtra("path"))
+                require(data != null)
+                AutofillService.instance?.setPickedPassword(data.getStringExtra("path")!!)
             }
             REQUEST_CODE_PICK_MATCH_WITH -> if (resultCode == RESULT_OK) {
+                require(data != null)
                 // need to not only decrypt the picked password, but also
                 // update the "match with" preference
                 val extras = intent.extras ?: return
                 val packageName = extras.getString("packageName")
                 val isWeb = extras.getBoolean("isWeb")
 
-                val path = data!!.getStringExtra("path")
+                val path = data.getStringExtra("path")
-                AutofillService.instance?.setPickedPassword(data.getStringExtra("path"))
+                AutofillService.instance?.setPickedPassword(data.getStringExtra("path")!!)
 
                 val prefs: SharedPreferences
                 prefs = if (!isWeb) {

app/src/main/java/com/zeapo/pwdstore/autofill/AutofillFragment.kt

@@ -66,7 +66,9 @@ class AutofillFragment : DialogFragment() {
                     ?: "com.android.browser")
         }
         try {
-            builder.setIcon(callingActivity.packageManager.getApplicationIcon(iconPackageName))
+            if (iconPackageName != null) {
+                builder.setIcon(callingActivity.packageManager.getApplicationIcon(iconPackageName))
+            }
         } catch (e: PackageManager.NameNotFoundException) {
             e.printStackTrace()
         }

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/AutofillHelper.kt

@@ -4,6 +4,7 @@
  */
 package com.zeapo.pwdstore.autofill.oreo
 
+import android.annotation.SuppressLint
 import android.app.assist.AssistStructure
 import android.content.Context
 import android.content.IntentSender
@@ -47,6 +48,12 @@ private fun stableHash(array: Collection<ByteArray>): String {
  * returns all of them in sorted order and separated with `;`.
  */
 fun computeCertificatesHash(context: Context, appPackage: String): String {
+    // The warning does not apply since 1) we are specifically hashing **all** signatures and 2) it
+    // no longer applies to Android 4.4+.
+    // Even though there is a new way to get the certificates as of Android Pie, we need to keep
+    // hashes comparable between versions and hence default to using the deprecated API.
+    @SuppressLint("PackageManagerGetSignatures")
+    @Suppress("DEPRECATION")
     val signaturesOld =
         context.packageManager.getPackageInfo(appPackage, PackageManager.GET_SIGNATURES).signatures
     val stableHashOld = stableHash(signaturesOld.map { it.toByteArray() })

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/AutofillMatcher.kt

@@ -157,6 +157,9 @@ class AutofillMatcher {
             for (prefs in listOf(context.autofillAppMatches, context.autofillWebMatches)) {
                 for ((key, value) in prefs.all) {
                     if (!key.startsWith(PREFERENCE_PREFIX_MATCHES)) continue
+                    // We know that preferences starting with `PREFERENCE_PREFIX_MATCHES` were
+                    // created with `putStringSet`.
+                    @Suppress("UNCHECKED_CAST")
                     val oldMatches = value as? Set<String>
                     if (oldMatches == null) {
                         w { "Failed to read matches for $key" }

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/AutofillStrategy.kt

@@ -60,7 +60,7 @@ val autofillStrategy = strategy {
             }
         }
         currentPassword {
-            takeSingle { alreadyMatched ->
+            takeSingle { _ ->
                 hasAutocompleteHintCurrentPassword && isFocused
             }
         }

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/ui/AutofillDecryptActivity.kt

@@ -188,7 +188,7 @@ class AutofillDecryptActivity : Activity(), CoroutineScope {
             }
             OpenPgpApi.RESULT_CODE_USER_INTERACTION_REQUIRED -> {
                 val pendingIntent: PendingIntent =
-                    result.getParcelableExtra(OpenPgpApi.RESULT_INTENT)
+                    result.getParcelableExtra(OpenPgpApi.RESULT_INTENT)!!
                 try {
                     val intentToResume = withContext(Dispatchers.Main) {
                         suspendCoroutine<Intent> { cont ->

app/src/main/java/com/zeapo/pwdstore/autofill/oreo/ui/AutofillSaveActivity.kt

@@ -101,7 +101,7 @@ class AutofillSaveActivity : Activity() {
             putExtras(
                 bundleOf(
                     "REPO_PATH" to repo.absolutePath,
-                    "FILE_PATH" to repo.resolve(intent.getStringExtra(EXTRA_FOLDER_NAME)).absolutePath,
+                    "FILE_PATH" to repo.resolve(intent.getStringExtra(EXTRA_FOLDER_NAME)!!).absolutePath,
                     "OPERATION" to "ENCRYPT",
                     "SUGGESTED_NAME" to intent.getStringExtra(EXTRA_NAME),
                     "SUGGESTED_PASS" to intent.getStringExtra(EXTRA_PASSWORD),

app/src/main/java/com/zeapo/pwdstore/crypto/PgpActivity.kt

@@ -4,6 +4,7 @@
  */
 package com.zeapo.pwdstore.crypto
 
+import android.annotation.SuppressLint
 import android.app.PendingIntent
 import android.content.BroadcastReceiver
 import android.content.ClipData
@@ -772,6 +773,7 @@ class PgpActivity : AppCompatActivity(), OpenPgpServiceConnection.OnBound {
         }
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     private inner class HoldToShowPasswordTransformation constructor(button: Button, private val onToggle: Runnable) :
             PasswordTransformationMethod(), View.OnTouchListener {
         private var shown = false
@@ -784,7 +786,6 @@ class PgpActivity : AppCompatActivity(), OpenPgpServiceConnection.OnBound {
             return if (shown) charSequence else super.getTransformation("12345", view)
         }
 
-        @Suppress("ClickableViewAccessibility")
         override fun onTouch(view: View, motionEvent: MotionEvent): Boolean {
             when (motionEvent.action) {
                 MotionEvent.ACTION_DOWN -> {

app/src/main/java/com/zeapo/pwdstore/pwgenxkpwd/PasswordBuilder.kt

@@ -127,6 +127,7 @@ class PasswordBuilder(ctx: Context) {
                         CapsType.TitleCase -> {
                             s = capitalize(s)
                         }
+                        CapsType.lowercase, CapsType.As_iS -> {}
                     }
                 }
                 password.append(s)

build.gradle

@@ -65,6 +65,7 @@ subprojects {
     tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
         kotlinOptions {
             jvmTarget = '1.8'
+            freeCompilerArgs += "-Xopt-in=kotlin.RequiresOptIn"
         }
     }
 }