Add confirm exist setting (closes #2615)

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -11,6 +11,8 @@ object PreferenceKeys {
 
     const val themeDark = "pref_theme_dark_key"
 
+    const val confirmExit = "pref_confirm_exit"
+
     const val rotation = "pref_rotation_type_key"
 
     const val enableTransitions = "pref_enable_transitions_key"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -54,6 +54,8 @@ class PreferencesHelper(val context: Context) {
 
     fun startScreen() = prefs.getInt(Keys.startScreen, 1)
 
+    fun confirmExit() = prefs.getBoolean(Keys.confirmExit, false)
+
     fun useBiometricLock() = flowPrefs.getBoolean(Keys.useBiometricLock, false)
 
     fun lockAppAfter() = flowPrefs.getInt(Keys.lockAppAfter, 0)

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -4,6 +4,7 @@ import android.app.SearchManager
 import android.content.Intent
 import android.os.Bundle
 import android.view.ViewGroup
+import android.widget.Toast
 import com.bluelinelabs.conductor.Conductor
 import com.bluelinelabs.conductor.Controller
 import com.bluelinelabs.conductor.ControllerChangeHandler
@@ -30,10 +31,12 @@ import eu.kanade.tachiyomi.ui.recent.updates.UpdatesController
 import eu.kanade.tachiyomi.ui.source.SourceController
 import eu.kanade.tachiyomi.ui.source.global_search.GlobalSearchController
 import eu.kanade.tachiyomi.util.lang.launchInUI
+import eu.kanade.tachiyomi.util.lang.launchUI
 import java.util.Date
 import java.util.concurrent.TimeUnit
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import timber.log.Timber
@@ -53,6 +56,7 @@ class MainActivity : BaseActivity<MainActivityBinding>() {
     lateinit var tabAnimator: ViewHeightAnimator
     private lateinit var bottomNavAnimator: ViewHeightAnimator
 
+    private var isConfirmingExit: Boolean = false
     private var isHandlingShortcut: Boolean = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -259,12 +263,35 @@ class MainActivity : BaseActivity<MainActivityBinding>() {
     override fun onBackPressed() {
         val backstackSize = router.backstackSize
         if (backstackSize == 1 && router.getControllerWithTag("$startScreenId") == null) {
+            // Return to start screen
             setSelectedNavItem(startScreenId)
+        } else if (shouldHandleExitConfirmation()) {
+            // Exit confirmation (resets after 2 seconds)
+            launchUI { resetExitConfirmation() }
         } else if (backstackSize == 1 || !router.handleBack()) {
+            // Regular back
             super.onBackPressed()
         }
     }
 
+    private suspend fun resetExitConfirmation() {
+        isConfirmingExit = true
+        val toast = Toast.makeText(this, R.string.confirm_exit, Toast.LENGTH_LONG)
+        toast.show()
+
+        delay(2000)
+
+        toast.cancel()
+        isConfirmingExit = false
+    }
+
+    private fun shouldHandleExitConfirmation(): Boolean {
+        return router.backstackSize == 1 &&
+            router.getControllerWithTag("$startScreenId") != null &&
+            preferences.confirmExit() &&
+            !isConfirmingExit
+    }
+
     fun setSelectedNavItem(itemId: Int) {
         if (!isFinishing) {
             binding.bottomNav.selectedItemId = itemId

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralController.kt

@@ -16,6 +16,7 @@ import eu.kanade.tachiyomi.util.preference.onChange
 import eu.kanade.tachiyomi.util.preference.onClick
 import eu.kanade.tachiyomi.util.preference.preference
 import eu.kanade.tachiyomi.util.preference.preferenceCategory
+import eu.kanade.tachiyomi.util.preference.switchPreference
 import eu.kanade.tachiyomi.util.preference.titleRes
 import eu.kanade.tachiyomi.util.system.LocaleHelper
 import kotlinx.coroutines.flow.onEach
@@ -36,6 +37,11 @@ class SettingsGeneralController : SettingsController() {
             defaultValue = "1"
             summary = "%s"
         }
+        switchPreference {
+            key = Keys.confirmExit
+            titleRes = R.string.pref_confirm_exit
+            defaultValue = false
+        }
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             preference {
                 titleRes = R.string.pref_manage_notifications