Use platform LocaleManager if possible

app/apk/src/main/AndroidManifest.xml

@@ -2,7 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
-    <application>
+    <application android:localeConfig="@xml/locale_config">
         <activity
             android:name=".ui.MainActivity"
             android:exported="true"

app/apk/src/main/java/com/topjohnwu/magisk/ui/deny/AppProcessInfo.kt

@@ -16,7 +16,7 @@ import android.os.Build
 import android.os.Build.VERSION.SDK_INT
 import androidx.core.os.ProcessCompat
 import com.topjohnwu.magisk.core.ktx.getLabel
-import com.topjohnwu.magisk.core.utils.currentLocale
+import java.util.Locale
 import java.util.TreeSet
 
 class CmdlineListItem(line: String) {
@@ -102,7 +102,7 @@ class AppProcessInfo(
 
     companion object {
         private val comparator = compareBy<AppProcessInfo>(
-            { it.label.lowercase(currentLocale) },
+            { it.label.lowercase(Locale.ROOT) },
             { it.info.packageName }
         )
     }

app/apk/src/main/java/com/topjohnwu/magisk/ui/settings/SettingsItems.kt

@@ -14,18 +14,16 @@ import com.topjohnwu.magisk.core.Const
 import com.topjohnwu.magisk.core.Info
 import com.topjohnwu.magisk.core.ktx.activity
 import com.topjohnwu.magisk.core.tasks.HideAPK
+import com.topjohnwu.magisk.core.utils.LocaleSetting
 import com.topjohnwu.magisk.core.utils.MediaStoreUtils
-import com.topjohnwu.magisk.core.utils.availableLocales
-import com.topjohnwu.magisk.core.utils.currentLocale
 import com.topjohnwu.magisk.databinding.DialogSettingsAppNameBinding
 import com.topjohnwu.magisk.databinding.DialogSettingsDownloadPathBinding
 import com.topjohnwu.magisk.databinding.DialogSettingsUpdateChannelBinding
 import com.topjohnwu.magisk.databinding.set
+import com.topjohnwu.magisk.utils.TextHolder
 import com.topjohnwu.magisk.utils.asText
 import com.topjohnwu.magisk.view.MagiskDialog
 import com.topjohnwu.superuser.Shell
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.launch
 import com.topjohnwu.magisk.core.R as CoreR
 
 // --- Customization
@@ -35,38 +33,28 @@ object Customization : BaseSettingsItem.Section() {
 }
 
 object Language : BaseSettingsItem.Selector() {
+    private val names: Array<String> get() = LocaleSetting.available.names
+    private val tags: Array<String> get() = LocaleSetting.available.tags
+
     override var value
-        get() = index
+        get() = tags.indexOf(Config.locale)
         set(value) {
-            index = value
-            Config.locale = entryValues[value]
+            Config.locale = tags[value]
         }
 
     override val title = CoreR.string.language.asText()
 
-    private var entries = emptyArray<String>()
-    private var entryValues = emptyArray<String>()
-    private var index = -1
+    override fun entries(res: Resources) = names
+    override fun descriptions(res: Resources) = names
+}
 
-    override fun entries(res: Resources) = entries
-    override fun descriptions(res: Resources) = entries
-
-    override fun onPressed(view: View, handler: Handler) {
-        if (entries.isNotEmpty())
-            super.onPressed(view, handler)
-    }
-
-    suspend fun loadLanguages(scope: CoroutineScope) {
-        scope.launch {
-            availableLocales().let { (names, values) ->
-                entries = names
-                entryValues = values
-                val selectedLocale = currentLocale.getDisplayName(currentLocale)
-                index = names.indexOfFirst { it == selectedLocale }.let { if (it == -1) 0 else it }
-                notifyPropertyChanged(BR.description)
-            }
+object LanguageSystem : BaseSettingsItem.Blank() {
+    override val title = CoreR.string.language.asText()
+    override val description: TextHolder
+        get() {
+            val locale = LocaleSetting.instance.appLocale
+            return locale?.getDisplayName(locale)?.asText() ?: CoreR.string.system_default.asText()
         }
-    }
 }
 
 object Theme : BaseSettingsItem.Blank() {

app/apk/src/main/java/com/topjohnwu/magisk/ui/settings/SettingsViewModel.kt

@@ -1,6 +1,10 @@
 package com.topjohnwu.magisk.ui.settings
 
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
 import android.os.Build
+import android.provider.Settings
 import android.view.View
 import android.widget.Toast
 import androidx.core.content.pm.ShortcutManagerCompat
@@ -16,6 +20,7 @@ import com.topjohnwu.magisk.core.isRunningAsStub
 import com.topjohnwu.magisk.core.ktx.activity
 import com.topjohnwu.magisk.core.ktx.toast
 import com.topjohnwu.magisk.core.tasks.HideAPK
+import com.topjohnwu.magisk.core.utils.LocaleSetting
 import com.topjohnwu.magisk.databinding.bindExtra
 import com.topjohnwu.magisk.events.AddHomeIconEvent
 import com.topjohnwu.magisk.events.AuthEvent
@@ -30,12 +35,6 @@ class SettingsViewModel : BaseViewModel(), BaseSettingsItem.Handler {
         it.put(BR.handler, this)
     }
 
-    init {
-        viewModelScope.launch {
-            Language.loadLanguages(this)
-        }
-    }
-
     private fun createItems(): List<BaseSettingsItem> {
         val context = AppContext
         val hidden = context.packageName != BuildConfig.APP_PACKAGE_NAME
@@ -43,7 +42,7 @@ class SettingsViewModel : BaseViewModel(), BaseSettingsItem.Handler {
         // Customization
         val list = mutableListOf(
             Customization,
-            Theme, Language
+            Theme, if (LocaleSetting.useLocaleManager) LanguageSystem else Language
         )
         if (isRunningAsStub && ShortcutManagerCompat.isRequestPinShortcutSupported(context))
             list.add(AddShortcut)
@@ -98,6 +97,7 @@ class SettingsViewModel : BaseViewModel(), BaseSettingsItem.Handler {
             SystemlessHosts -> createHosts()
             Hide, Restore -> withInstallPermission(andThen)
             AddShortcut -> AddHomeIconEvent().publish()
+            LanguageSystem -> launchAppLocaleSettings(view.activity)
             else -> andThen()
         }
     }
@@ -112,6 +112,12 @@ class SettingsViewModel : BaseViewModel(), BaseSettingsItem.Handler {
         }
     }
 
+    private fun launchAppLocaleSettings(activity: Activity) {
+        val intent = Intent(Settings.ACTION_APP_LOCALE_SETTINGS)
+        intent.data = Uri.fromParts("package", activity.packageName, null)
+        activity.startActivity(intent)
+    }
+
     private fun openUrlIfNecessary(view: View) {
         UpdateChannelUrl.refresh()
         if (UpdateChannelUrl.isEnabled && UpdateChannelUrl.value.isBlank()) {

app/apk/src/main/java/com/topjohnwu/magisk/ui/superuser/SuperuserViewModel.kt

@@ -16,7 +16,6 @@ import com.topjohnwu.magisk.core.R
 import com.topjohnwu.magisk.core.data.magiskdb.PolicyDao
 import com.topjohnwu.magisk.core.ktx.getLabel
 import com.topjohnwu.magisk.core.model.su.SuPolicy
-import com.topjohnwu.magisk.core.utils.currentLocale
 import com.topjohnwu.magisk.databinding.MergeObservableList
 import com.topjohnwu.magisk.databinding.RvItem
 import com.topjohnwu.magisk.databinding.bindExtra
@@ -30,6 +29,7 @@ import com.topjohnwu.magisk.view.TextItem
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import java.util.Locale
 
 class SuperuserViewModel(
     private val db: PolicyDao
@@ -92,7 +92,7 @@ class SuperuserViewModel(
                 policies.addAll(map)
             }
             policies.sortWith(compareBy(
-                { it.appName.lowercase(currentLocale) },
+                { it.appName.lowercase(Locale.ROOT) },
                 { it.packageName }
             ))
             itemsPolicies.update(policies)

app/apk/src/main/java/com/topjohnwu/magisk/utils/MotionRevealHelper.kt

@@ -14,7 +14,7 @@ import androidx.interpolator.view.animation.FastOutSlowInInterpolator
 import com.google.android.material.circularreveal.CircularRevealCompat
 import com.google.android.material.circularreveal.CircularRevealWidget
 import com.google.android.material.floatingactionbutton.FloatingActionButton
-import com.topjohnwu.magisk.core.utils.currentLocale
+import com.topjohnwu.magisk.core.utils.LocaleSetting
 import kotlin.math.hypot
 
 object MotionRevealHelper {
@@ -63,7 +63,9 @@ object MotionRevealHelper {
         it.interpolator = FastOutSlowInInterpolator()
         it.addListener(onStart = { show() }, onEnd = { if (revealInfo.radius != 0f) hide() })
 
-        val rtlMod = if (currentLocale.layoutDirection == View.LAYOUT_DIRECTION_RTL) 1f else -1f
+        val rtlMod =
+            if (LocaleSetting.instance.currentLocale.layoutDirection == View.LAYOUT_DIRECTION_RTL)
+                1f else -1f
         val maxX = revealInfo.centerX - marginEnd - measuredWidth / 2f
         val targetX = if (revealInfo.radius == 0f) 0f else maxX * rtlMod
         val moveX = ObjectAnimator.ofFloat(this, View.TRANSLATION_X, targetX)