Recreate all activities on theme changed

app/src/main/java/org/koitharu/kotatsu/KotatsuApp.kt

@@ -7,6 +7,7 @@ import androidx.fragment.app.strictmode.FragmentStrictMode
 import org.koin.android.ext.android.get
 import org.koin.android.ext.koin.androidContext
 import org.koin.core.context.startKoin
+import org.koitharu.kotatsu.base.ui.util.ActivityRecreationHandle
 import org.koitharu.kotatsu.bookmarks.bookmarksModule
 import org.koitharu.kotatsu.core.db.databaseModule
 import org.koitharu.kotatsu.core.github.githubModule
@@ -43,6 +44,7 @@ class KotatsuApp : Application() {
 		Thread.setDefaultUncaughtExceptionHandler(AppCrashHandler(applicationContext))
 		AppCompatDelegate.setDefaultNightMode(get<AppSettings>().theme)
 		registerActivityLifecycleCallbacks(get<AppProtectHelper>())
+		registerActivityLifecycleCallbacks(get<ActivityRecreationHandle>())
 		val widgetUpdater = WidgetUpdater(applicationContext)
 		widgetUpdater.subscribeToFavourites(get())
 		widgetUpdater.subscribeToHistory(get())

app/src/main/java/org/koitharu/kotatsu/base/ui/util/ActivityRecreationHandle.kt

@@ -0,0 +1,34 @@
+package org.koitharu.kotatsu.base.ui.util
+
+import android.app.Activity
+import android.app.Application.ActivityLifecycleCallbacks
+import android.os.Bundle
+import java.util.*
+
+class ActivityRecreationHandle : ActivityLifecycleCallbacks {
+
+	private val activities = WeakHashMap<Activity, Unit>()
+
+	override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
+		activities[activity] = Unit
+	}
+
+	override fun onActivityStarted(activity: Activity) = Unit
+
+	override fun onActivityResumed(activity: Activity) = Unit
+
+	override fun onActivityPaused(activity: Activity) = Unit
+
+	override fun onActivityStopped(activity: Activity) = Unit
+
+	override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) = Unit
+
+	override fun onActivityDestroyed(activity: Activity) {
+		activities.remove(activity)
+	}
+
+	fun recreateAll() {
+		val snapshot = activities.keys.toList()
+		snapshot.forEach { it.recreate() }
+	}
+}

app/src/main/java/org/koitharu/kotatsu/main/MainModule.kt

@@ -3,6 +3,7 @@ package org.koitharu.kotatsu.main
 import org.koin.android.ext.koin.androidContext
 import org.koin.androidx.viewmodel.dsl.viewModel
 import org.koin.dsl.module
+import org.koitharu.kotatsu.base.ui.util.ActivityRecreationHandle
 import org.koitharu.kotatsu.core.os.ShortcutsRepository
 import org.koitharu.kotatsu.main.ui.MainViewModel
 import org.koitharu.kotatsu.main.ui.protect.AppProtectHelper
@@ -11,6 +12,7 @@ import org.koitharu.kotatsu.main.ui.protect.ProtectViewModel
 val mainModule
 	get() = module {
 		single { AppProtectHelper(get()) }
+		single { ActivityRecreationHandle() }
 		factory { ShortcutsRepository(androidContext(), get(), get(), get()) }
 		viewModel { MainViewModel(get(), get()) }
 		viewModel { ProtectViewModel(get(), get()) }

app/src/main/java/org/koitharu/kotatsu/settings/AppearanceSettingsFragment.kt

@@ -8,15 +8,17 @@ import androidx.appcompat.app.AppCompatDelegate
 import androidx.preference.ListPreference
 import androidx.preference.Preference
 import androidx.preference.TwoStatePreference
+import java.util.*
+import org.koin.android.ext.android.get
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BasePreferenceFragment
+import org.koitharu.kotatsu.base.ui.util.ActivityRecreationHandle
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.parsers.util.names
 import org.koitharu.kotatsu.settings.protect.ProtectSetupActivity
 import org.koitharu.kotatsu.settings.utils.SliderPreference
 import org.koitharu.kotatsu.utils.ext.setDefaultValueCompat
-import java.util.*
 
 class AppearanceSettingsFragment :
 	BasePreferenceFragment(R.string.appearance),
@@ -71,10 +73,10 @@ class AppearanceSettingsFragment :
 				AppCompatDelegate.setDefaultNightMode(settings.theme)
 			}
 			AppSettings.KEY_DYNAMIC_THEME -> {
-				findPreference<Preference>(key)?.setSummary(R.string.restart_required)
+				get<ActivityRecreationHandle>().recreateAll()
 			}
 			AppSettings.KEY_THEME_AMOLED -> {
-				findPreference<Preference>(key)?.setSummary(R.string.restart_required)
+				get<ActivityRecreationHandle>().recreateAll()
 			}
 			AppSettings.KEY_APP_PASSWORD -> {
 				findPreference<TwoStatePreference>(AppSettings.KEY_PROTECT_APP)