Migrate LocaleNotification to main trunk

Bug: 248514263
Test: make RunSettingsRoboTests -j128 ROBOTEST_FILTER=AppLocalePickerActivityTest LocaleListEditorTest LocaleNotificationDataManagerTest NotificationCancelReceiverTest NotificationControllerTest
Change-Id: Iac7ffd493485be8ebb10ae63e5ca4ea7a57c8c78

src/com/android/settings/localepicker/AppLocalePickerActivity.java

@@ -18,13 +18,17 @@ package com.android.settings.localepicker;
 
 import android.app.FragmentTransaction;
 import android.app.LocaleManager;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
 import android.content.Intent;
-import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.LocaleList;
+import android.os.SystemClock;
 import android.os.SystemProperties;
+import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.MenuItem;
@@ -32,8 +36,7 @@ import android.view.View;
 import android.widget.FrameLayout;
 import android.widget.ListView;
 
-import androidx.activity.result.ActivityResultLauncher;
-import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.core.app.NotificationCompat;
 import androidx.core.view.ViewCompat;
 
 import com.android.internal.app.LocalePickerWithRegion;
@@ -43,19 +46,23 @@ import com.android.settings.applications.AppLocaleUtil;
 import com.android.settings.applications.appinfo.AppLocaleDetails;
 import com.android.settings.core.SettingsBaseActivity;
 
-import java.util.Locale;
-
 public class AppLocalePickerActivity extends SettingsBaseActivity
         implements LocalePickerWithRegion.LocaleSelectedListener, MenuItem.OnActionExpandListener {
     private static final String TAG = AppLocalePickerActivity.class.getSimpleName();
+    private static final String CHANNEL_ID_SUGGESTION = "suggestion";
+    private static final String CHANNEL_ID_SUGGESTION_TO_USER = "Locale suggestion";
+    private static final String EXTRA_SYSTEM_LOCALE_DIALOG_TYPE = "system_locale_dialog_type";
+    private static final String LOCALE_SUGGESTION = "locale_suggestion";
+    static final boolean ENABLED = false;
     static final String EXTRA_APP_LOCALE = "app_locale";
-    private static final String PROP_SYSTEM_LOCALE_SUGGESTION = "android.system.locale.suggestion";
-    private static final boolean ENABLED = false;
+    static final String EXTRA_NOTIFICATION_ID = "notification_id";
+    static final String PROP_SYSTEM_LOCALE_SUGGESTION = "android.system.locale.suggestion";
 
     private String mPackageName;
     private LocalePickerWithRegion mLocalePickerWithRegion;
     private AppLocaleDetails mAppLocaleDetails;
     private View mAppLocaleDetailContainer;
+    private NotificationController mNotificationController;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -81,6 +88,7 @@ public class AppLocalePickerActivity extends SettingsBaseActivity
 
         setTitle(R.string.app_locale_picker_title);
         getActionBar().setDisplayHomeAsUpEnabled(true);
+        mNotificationController = NotificationController.getInstance(this);
 
         mLocalePickerWithRegion = LocalePickerWithRegion.createLanguagePicker(
                 this,
@@ -146,52 +154,78 @@ public class AppLocalePickerActivity extends SettingsBaseActivity
         if (!SystemProperties.getBoolean(PROP_SYSTEM_LOCALE_SUGGESTION, ENABLED)) {
             return;
         }
-        String languageTag = localeInfo.getLocale().toLanguageTag();
-        if (isInSystemLocale(languageTag) || localeInfo.isAppCurrentLocale()) {
+        String localeTag = localeInfo.getLocale().toLanguageTag();
+        if (LocaleUtils.isInSystemLocale(localeTag) || localeInfo.isAppCurrentLocale()) {
             return;
         }
-        String intentAction = getString(R.string.config_app_locale_intent_action);
-        if (!TextUtils.isEmpty(intentAction)) {
-            try {
-                PackageManager packageManager = getPackageManager();
-                ApplicationInfo info = packageManager.getApplicationInfo(mPackageName,
-                        PackageManager.GET_META_DATA);
-                Intent intent = new Intent(intentAction)
-                        .putExtra(Intent.EXTRA_UID, info.uid)
-                        .putExtra(EXTRA_APP_LOCALE, languageTag);
-                if (intent.resolveActivity(packageManager) != null) {
-                    mStartForResult.launch(intent);
-                }
-            } catch (PackageManager.NameNotFoundException e) {
-                Log.e(TAG, "Unable to find info for package: " + mPackageName);
+        try {
+            int uid = getPackageManager().getApplicationInfo(mPackageName,
+                    PackageManager.GET_META_DATA).uid;
+            boolean launchNotification = mNotificationController.shouldTriggerNotification(
+                    uid, localeTag);
+            if (launchNotification) {
+                triggerNotification(
+                        mNotificationController.getNotificationId(localeTag),
+                        getString(R.string.title_system_locale_addition,
+                                localeInfo.getFullNameNative()),
+                        getString(R.string.desc_system_locale_addition),
+                        localeTag);
             }
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.e(TAG, "Unable to find info for package: " + mPackageName);
         }
     }
 
-    // Invoke startActivityFroResult so that the calling package can be shared via the intent.
-    private ActivityResultLauncher<Intent> mStartForResult = registerForActivityResult(
-            new ActivityResultContracts.StartActivityForResult(),
-            result -> {
-            }
-    );
+    private void triggerNotification(
+            int notificationId,
+            String title,
+            String description,
+            String localeTag) {
+        NotificationManager notificationManager = getSystemService(NotificationManager.class);
+        final boolean channelExist =
+                notificationManager.getNotificationChannel(CHANNEL_ID_SUGGESTION) != null;
 
-    /**
-     * Checks if the localeTag is in the system locale. Since in the current design, the system
-     * language list would not show two locales with the same language and region but different
-     * numbering system. So, during the comparison, the extension has to be stripped.
-     *
-     * @param languageTag A language tag
-     * @return true if the locale is in the system locale. Otherwise, false.
-     */
-    private static boolean isInSystemLocale(String languageTag) {
-        LocaleList systemLocales = LocaleList.getDefault();
-        Locale locale = Locale.forLanguageTag(languageTag).stripExtensions();
-        for (int i = 0; i < systemLocales.size(); i++) {
-            if (locale.equals(systemLocales.get(i).stripExtensions())) {
-                return true;
-            }
+        // Create an alert channel if it does not exist
+        if (!channelExist) {
+            NotificationChannel channel =
+                    new NotificationChannel(
+                            CHANNEL_ID_SUGGESTION,
+                            CHANNEL_ID_SUGGESTION_TO_USER,
+                            NotificationManager.IMPORTANCE_DEFAULT);
+            channel.setSound(/* sound */ null, /* audioAttributes */ null); // silent notification
+            notificationManager.createNotificationChannel(channel);
         }
-        return false;
+
+        final NotificationCompat.Builder builder =
+                new NotificationCompat.Builder(this, CHANNEL_ID_SUGGESTION)
+                        .setSmallIcon(R.drawable.ic_settings_language)
+                        .setAutoCancel(true)
+                        .setContentTitle(title)
+                        .setContentText(description)
+                        .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                        .setContentIntent(
+                                createPendingIntent(localeTag, notificationId, false))
+                        .setDeleteIntent(
+                                createPendingIntent(localeTag, notificationId, true));
+        notificationManager.notify(notificationId, builder.build());
+    }
+
+    private PendingIntent createPendingIntent(String locale, int notificationId,
+            boolean isDeleteIntent) {
+        Intent intent = isDeleteIntent
+                ? new Intent(this, NotificationCancelReceiver.class)
+                : new Intent(Settings.ACTION_LOCALE_SETTINGS)
+                        .putExtra(EXTRA_SYSTEM_LOCALE_DIALOG_TYPE, LOCALE_SUGGESTION)
+                        .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+
+        intent.putExtra(EXTRA_APP_LOCALE, locale)
+                .putExtra(EXTRA_NOTIFICATION_ID, notificationId);
+        int flag = PendingIntent.FLAG_IMMUTABLE | PendingIntent.FLAG_UPDATE_CURRENT;
+        int elapsedTime = (int) SystemClock.elapsedRealtimeNanos();
+
+        return isDeleteIntent
+                ? PendingIntent.getBroadcast(this, elapsedTime, intent, flag)
+                : PendingIntent.getActivity(this, elapsedTime, intent, flag);
     }
 
     private View launchAppLocaleDetailsPage() {

src/com/android/settings/localepicker/LocaleDialogFragment.java

@@ -51,6 +51,7 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
 
     static final int DIALOG_CONFIRM_SYSTEM_DEFAULT = 1;
     static final int DIALOG_NOT_AVAILABLE_LOCALE = 2;
+    static final int DIALOG_ADD_SYSTEM_LOCALE = 3;
 
     static final String ARG_DIALOG_TYPE = "arg_dialog_type";
     static final String ARG_TARGET_LOCALE = "arg_target_locale";
@@ -95,7 +96,8 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
             mShouldKeepDialog = savedInstanceState.getBoolean(ARG_SHOW_DIALOG, false);
             // Keep the dialog if user rotates the device, otherwise close the confirm system
             // default dialog only when user changes the locale.
-            if (type == DIALOG_CONFIRM_SYSTEM_DEFAULT && !mShouldKeepDialog) {
+            if ((type == DIALOG_CONFIRM_SYSTEM_DEFAULT || type == DIALOG_ADD_SYSTEM_LOCALE)
+                    && !mShouldKeepDialog) {
                 dismiss();
             }
         }
@@ -192,7 +194,8 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
 
         @Override
         public void onClick(DialogInterface dialog, int which) {
-            if (mDialogType == DIALOG_CONFIRM_SYSTEM_DEFAULT) {
+            if (mDialogType == DIALOG_CONFIRM_SYSTEM_DEFAULT
+                    || mDialogType == DIALOG_ADD_SYSTEM_LOCALE) {
                 int result = Activity.RESULT_CANCELED;
                 boolean changed = false;
                 if (which == DialogInterface.BUTTON_POSITIVE) {
@@ -201,9 +204,12 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
                 }
                 Intent intent = new Intent();
                 Bundle bundle = new Bundle();
-                bundle.putInt(ARG_DIALOG_TYPE, DIALOG_CONFIRM_SYSTEM_DEFAULT);
+                bundle.putInt(ARG_DIALOG_TYPE, mDialogType);
+                bundle.putSerializable(LocaleDialogFragment.ARG_TARGET_LOCALE, mLocaleInfo);
                 intent.putExtras(bundle);
-                mParent.onActivityResult(DIALOG_CONFIRM_SYSTEM_DEFAULT, result, intent);
+                mParent.onActivityResult(mDialogType, result, intent);
+                mMetricsFeatureProvider.action(mContext, SettingsEnums.ACTION_CHANGE_LANGUAGE,
+                        changed);
             }
             mShouldKeepDialog = false;
         }
@@ -227,6 +233,15 @@ public class LocaleDialogFragment extends InstrumentedDialogFragment {
                     dialogContent.mMessage = mContext.getString(R.string.desc_unavailable_locale);
                     dialogContent.mPositiveButton = mContext.getString(R.string.okay);
                     break;
+                case DIALOG_ADD_SYSTEM_LOCALE:
+                    dialogContent.mTitle = String.format(mContext.getString(
+                                    R.string.title_system_locale_addition),
+                            mLocaleInfo.getFullNameNative());
+                    dialogContent.mMessage = mContext.getString(
+                            R.string.desc_system_locale_addition);
+                    dialogContent.mPositiveButton = mContext.getString(R.string.add);
+                    dialogContent.mNegativeButton = mContext.getString(R.string.cancel);
+                    break;
                 default:
                     break;
             }

src/com/android/settings/localepicker/LocaleListEditor.java

@@ -19,6 +19,8 @@ package com.android.settings.localepicker;
 import static android.os.UserManager.DISALLOW_CONFIG_LOCALE;
 
 import static com.android.settings.localepicker.AppLocalePickerActivity.EXTRA_APP_LOCALE;
+import static com.android.settings.localepicker.AppLocalePickerActivity.EXTRA_NOTIFICATION_ID;
+import static com.android.settings.localepicker.LocaleDialogFragment.DIALOG_ADD_SYSTEM_LOCALE;
 import static com.android.settings.localepicker.LocaleDialogFragment.DIALOG_CONFIRM_SYSTEM_DEFAULT;
 
 import android.app.Activity;
@@ -29,6 +31,7 @@ import android.content.Intent;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.os.LocaleList;
+import android.os.SystemProperties;
 import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.Log;
@@ -59,7 +62,6 @@ import com.android.settingslib.utils.StringUtil;
 import com.android.settingslib.widget.LayoutPreference;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
 
@@ -68,20 +70,22 @@ import java.util.Locale;
  */
 @SearchIndexable
 public class LocaleListEditor extends RestrictedSettingsFragment implements View.OnTouchListener {
-    private static final String TAG = LocaleListEditor.class.getSimpleName();
     protected static final String INTENT_LOCALE_KEY = "localeInfo";
+
+    private static final String TAG = LocaleListEditor.class.getSimpleName();
     private static final String CFGKEY_REMOVE_MODE = "localeRemoveMode";
     private static final String CFGKEY_REMOVE_DIALOG = "showingLocaleRemoveDialog";
     private static final String CFGKEY_ADD_LOCALE = "localeAdded";
-    private static final int MENU_ID_REMOVE = Menu.FIRST + 1;
-    private static final int REQUEST_LOCALE_PICKER = 0;
-
     private static final String INDEX_KEY_ADD_LANGUAGE = "add_language";
     private static final String KEY_LANGUAGES_PICKER = "languages_picker";
     private static final String TAG_DIALOG_CONFIRM_SYSTEM_DEFAULT = "dialog_confirm_system_default";
     private static final String TAG_DIALOG_NOT_AVAILABLE = "dialog_not_available_locale";
-    static final String EXTRA_SYSTEM_LOCALE_DIALOG_TYPE = "system_locale_dialog_type";
+    private static final String TAG_DIALOG_ADD_SYSTEM_LOCALE = "dialog_add_system_locale";
+    private static final String EXTRA_SYSTEM_LOCALE_DIALOG_TYPE = "system_locale_dialog_type";
     private static final String LOCALE_SUGGESTION = "locale_suggestion";
+    private static final int MENU_ID_REMOVE = Menu.FIRST + 1;
+    private static final int REQUEST_LOCALE_PICKER = 0;
+    private static final int INVALID_NOTIFICATION_ID = -1;
 
     private LocaleDragAndDropAdapter mAdapter;
     private Menu mMenu;
@@ -170,9 +174,10 @@ public class LocaleListEditor extends RestrictedSettingsFragment implements View
         if (mShowingRemoveDialog) {
             showRemoveLocaleWarningDialog();
         }
-        if (shouldShowConfirmationDialog() && !mLocaleAdditionMode) {
-            getActivity().setResult(Activity.RESULT_OK);
+        Log.d(TAG, "LocaleAdditionMode:" + mLocaleAdditionMode);
+        if (!mLocaleAdditionMode && shouldShowConfirmationDialog()) {
             showDialogForAddedLocale();
+            mLocaleAdditionMode = true;
         }
     }
 
@@ -236,18 +241,19 @@ public class LocaleListEditor extends RestrictedSettingsFragment implements View
                 mAdapter.notifyListChanged(localeInfo);
             }
             mAdapter.setCacheItemList();
+        } else if (requestCode == DIALOG_ADD_SYSTEM_LOCALE) {
+            if (resultCode == Activity.RESULT_OK) {
+                localeInfo = (LocaleStore.LocaleInfo) data.getExtras().getSerializable(
+                        LocaleDialogFragment.ARG_TARGET_LOCALE);
+                String preferencesTags = Settings.System.getString(
+                        getContext().getContentResolver(),
+                        Settings.System.LOCALE_PREFERENCES);
+                mAdapter.addLocale(mayAppendUnicodeTags(localeInfo, preferencesTags));
+            }
         }
         super.onActivityResult(requestCode, resultCode, data);
     }
 
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        if (mSuggestionDialog != null) {
-            mSuggestionDialog.dismiss();
-        }
-    }
-
     @VisibleForTesting
     static LocaleStore.LocaleInfo mayAppendUnicodeTags(
             LocaleStore.LocaleInfo localeInfo, String recordTags) {
@@ -276,31 +282,42 @@ public class LocaleListEditor extends RestrictedSettingsFragment implements View
         Intent intent = this.getIntent();
         String dialogType = intent.getStringExtra(EXTRA_SYSTEM_LOCALE_DIALOG_TYPE);
         String localeTag = intent.getStringExtra(EXTRA_APP_LOCALE);
-        if (!isAllowedPackage()
-                || isNullOrEmpty(dialogType)
-                || isNullOrEmpty(localeTag)
-                || !LOCALE_SUGGESTION.equals(dialogType)
+        int notificationId = intent.getIntExtra(EXTRA_NOTIFICATION_ID, INVALID_NOTIFICATION_ID);
+        if (!isDialogFeatureEnabled()
+                || !isValidNotificationId(localeTag, notificationId)
+                || !isValidDialogType(dialogType)
                 || !isValidLocale(localeTag)
-                || isInSystemLocale(localeTag)) {
-            getActivity().setResult(Activity.RESULT_CANCELED);
+                || LocaleUtils.isInSystemLocale(localeTag)) {
             return false;
         }
-        getActivity().setResult(Activity.RESULT_OK);
         return true;
     }
 
-    private boolean isAllowedPackage() {
-        List<String> allowList = Arrays.asList(getContext().getResources().getStringArray(
-                R.array.allowed_packages_for_locale_confirmation_diallog));
-        String callingPackage = getActivity().getCallingPackage();
-        return !isNullOrEmpty(callingPackage) && allowList.contains(callingPackage);
+    private boolean isDialogFeatureEnabled() {
+        return SystemProperties.getBoolean(AppLocalePickerActivity.PROP_SYSTEM_LOCALE_SUGGESTION,
+                AppLocalePickerActivity.ENABLED);
     }
 
-    private static boolean isNullOrEmpty(String str) {
-        return str == null || str.isEmpty();
+    private boolean isValidNotificationId(String localeTag, long id) {
+        if (id == -1) {
+            return false;
+        }
+        return id == getNotificationController().getNotificationId(localeTag);
+    }
+
+    @VisibleForTesting
+    NotificationController getNotificationController() {
+        return NotificationController.getInstance(getContext());
+    }
+
+    private boolean isValidDialogType(String type) {
+        return LOCALE_SUGGESTION.equals(type);
     }
 
     private boolean isValidLocale(String tag) {
+        if (TextUtils.isEmpty(tag)) {
+            return false;
+        }
         String[] systemLocales = getSupportedLocales();
         for (String systemTag : systemLocales) {
             if (systemTag.equals(tag)) {
@@ -310,63 +327,26 @@ public class LocaleListEditor extends RestrictedSettingsFragment implements View
         return false;
     }
 
-    protected String[] getSupportedLocales() {
+    @VisibleForTesting
+    String[] getSupportedLocales() {
         return LocalePicker.getSupportedLocales(getContext());
     }
 
-    /**
-     *  Check if the localeTag is in the system locale. Since in the current design, the system
-     *  language list would not show two locales with the same language and region but different
-     *  numbering system. So, during the comparison, the u extension has to be stripped out.
-     *
-     * @param languageTag A language tag
-     * @return true if the locale is in the system locale. Otherwise, false.
-     */
-    private boolean isInSystemLocale(String languageTag) {
-        LocaleList systemLocales = LocaleList.getDefault();
-        Locale locale = Locale.forLanguageTag(languageTag).stripExtensions();
-        for (int i = 0; i < systemLocales.size(); i++) {
-            if (systemLocales.get(i).stripExtensions().equals(locale)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
     private void showDialogForAddedLocale() {
+        Log.d(TAG, "Show confirmation dialog");
         Intent intent = this.getIntent();
         String dialogType = intent.getStringExtra(EXTRA_SYSTEM_LOCALE_DIALOG_TYPE);
         String appLocaleTag = intent.getStringExtra(EXTRA_APP_LOCALE);
-        Log.d(TAG, "Dialog suggested locale: " + appLocaleTag);
+
         LocaleStore.LocaleInfo localeInfo = LocaleStore.getLocaleInfo(
                 Locale.forLanguageTag(appLocaleTag));
-        if (LOCALE_SUGGESTION.equals(dialogType)) {
-            AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getActivity());
-            customizeLayout(dialogBuilder, localeInfo.getFullNameNative());
-            dialogBuilder
-                    .setPositiveButton(R.string.add, new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            mLocaleAdditionMode = true;
-                            String preferencesTags = Settings.System.getString(
-                                    getContext().getContentResolver(),
-                                    Settings.System.LOCALE_PREFERENCES);
-                            mAdapter.addLocale(mayAppendUnicodeTags(localeInfo, preferencesTags));
-                        }
-                    })
-                    .setNegativeButton(android.R.string.cancel,
-                            new DialogInterface.OnClickListener() {
-                                @Override
-                                public void onClick(DialogInterface dialog, int which) {
-                                    mLocaleAdditionMode = true;
-                                }
-                            });
-            mSuggestionDialog = dialogBuilder.create();
-            mSuggestionDialog.setCanceledOnTouchOutside(false);
-            mSuggestionDialog.show();
-        } else {
-            Log.d(TAG, "Invalid parameter, dialogType:" + dialogType);
-        }
+        final LocaleDialogFragment localeDialogFragment =
+                LocaleDialogFragment.newInstance();
+        Bundle args = new Bundle();
+        args.putInt(LocaleDialogFragment.ARG_DIALOG_TYPE, DIALOG_ADD_SYSTEM_LOCALE);
+        args.putSerializable(LocaleDialogFragment.ARG_TARGET_LOCALE, localeInfo);
+        localeDialogFragment.setArguments(args);
+        localeDialogFragment.show(mFragmentManager, TAG_DIALOG_ADD_SYSTEM_LOCALE);
     }
 
     private void customizeLayout(AlertDialog.Builder dialogBuilder, String language) {

src/com/android/settings/localepicker/LocaleNotificationDataManager.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.localepicker;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.google.gson.Gson;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A data manager that manages the {@link SharedPreferences} for the locale notification
+ * information.
+ */
+public class LocaleNotificationDataManager {
+    private static final String LOCALE_NOTIFICATION = "locale_notification";
+    private Context mContext;
+
+    /**
+     * Constructor
+     *
+     * @param context The context
+     */
+    public LocaleNotificationDataManager(Context context) {
+        this.mContext = context;
+    }
+
+    private static SharedPreferences getSharedPreferences(Context context) {
+        return context.getSharedPreferences(LOCALE_NOTIFICATION, Context.MODE_PRIVATE);
+    }
+
+    /**
+     * Adds one entry with the corresponding locale and {@link NotificationInfo} to the
+     * {@link SharedPreferences}.
+     *
+     * @param locale A locale which the application sets to
+     * @param info   The notification metadata
+     */
+    public void putNotificationInfo(String locale, NotificationInfo info) {
+        Gson gson = new Gson();
+        String json = gson.toJson(info);
+        SharedPreferences.Editor editor = getSharedPreferences(mContext).edit();
+        editor.putString(locale, json);
+        editor.apply();
+    }
+
+    /**
+     * Gets the {@link NotificationInfo} with the associated locale from the
+     * {@link SharedPreferences}.
+     *
+     * @param locale A locale which the application sets to
+     * @return {@link NotificationInfo}
+     */
+    public NotificationInfo getNotificationInfo(String locale) {
+        Gson gson = new Gson();
+        String json = getSharedPreferences(mContext).getString(locale, "");
+        return json.isEmpty() ? null : gson.fromJson(json, NotificationInfo.class);
+    }
+
+    /**
+     * Gets the locale notification map.
+     *
+     * @return A map which maps the locale to the corresponding {@link NotificationInfo}
+     */
+    public Map<String, NotificationInfo> getLocaleNotificationInfoMap() {
+        Gson gson = new Gson();
+        Map<String, String> map = (Map<String, String>) getSharedPreferences(mContext).getAll();
+        Map<String, NotificationInfo> result = new HashMap<>(map.size());
+        map.forEach((key, value) -> {
+            result.put(key, gson.fromJson(value, NotificationInfo.class));
+        });
+        return result;
+    }
+
+    /**
+     * Clears the locale notification map.
+     */
+    @VisibleForTesting
+    void clearLocaleNotificationMap() {
+        getSharedPreferences(mContext).edit().clear().apply();
+    }
+}

src/com/android/settings/localepicker/LocaleUtils.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.localepicker;
+
+import android.os.LocaleList;
+
+import androidx.annotation.NonNull;
+
+import java.util.Locale;
+
+/**
+ * A locale utility class.
+ */
+public class LocaleUtils {
+    /**
+     * Checks if the languageTag is in the system locale. Since in the current design, the system
+     * language list would not show two locales with the same language and region but different
+     * numbering system. So, the u extension has to be stripped out in the process of comparison.
+     *
+     * @param languageTag A language tag
+     * @return true if the locale is in the system locale. Otherwise, false.
+     */
+    public static boolean isInSystemLocale(@NonNull String languageTag) {
+        LocaleList systemLocales = LocaleList.getDefault();
+        Locale localeWithoutUextension =
+                new Locale.Builder()
+                        .setLocale(Locale.forLanguageTag(languageTag))
+                        .clearExtensions()
+                        .build();
+        for (int i = 0; i < systemLocales.size(); i++) {
+            Locale sysLocaleWithoutUextension =
+                    new Locale.Builder().setLocale(systemLocales.get(i)).clearExtensions().build();
+            if (localeWithoutUextension.equals(sysLocaleWithoutUextension)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

src/com/android/settings/localepicker/NotificationCancelReceiver.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.localepicker;
+
+import static com.android.settings.localepicker.AppLocalePickerActivity.EXTRA_APP_LOCALE;
+import static com.android.settings.localepicker.AppLocalePickerActivity.EXTRA_NOTIFICATION_ID;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
+
+/**
+ * A Broadcast receiver that handles the locale notification which is swiped away.
+ */
+public class NotificationCancelReceiver extends BroadcastReceiver {
+    private static final String TAG = NotificationCancelReceiver.class.getSimpleName();
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        String appLocale = intent.getExtras().getString(EXTRA_APP_LOCALE);
+        int notificationId = intent.getExtras().getInt(EXTRA_NOTIFICATION_ID, -1);
+        int savedNotificationID = getNotificationController(context).getNotificationId(
+                appLocale);
+        Log.i(TAG, "Locale notification is swiped away.");
+        if (savedNotificationID == notificationId) {
+            getNotificationController(context).incrementDismissCount(appLocale);
+        }
+    }
+
+    @VisibleForTesting
+    NotificationController getNotificationController(Context context) {
+        return NotificationController.getInstance(context);
+    }
+}

src/com/android/settings/localepicker/NotificationController.java

@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.localepicker;
+
+import android.content.Context;
+import android.os.SystemClock;
+import android.os.SystemProperties;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
+
+import java.util.Calendar;
+import java.util.Set;
+
+/**
+ * A controller that evaluates whether the notification can be triggered and update the
+ * SharedPreference.
+ */
+public class NotificationController {
+    private static final String TAG = NotificationController.class.getSimpleName();
+    private static final int DISMISS_COUNT_THRESHOLD = 2;
+    private static final int NOTIFICATION_COUNT_THRESHOLD = 2;
+    private static final int MULTIPLE_BASE = 2;
+    // seven days: 7 * 24 * 60
+    private static final int MIN_DURATION_BETWEEN_NOTIFICATIONS_MIN = 10080;
+    private static final String PROPERTY_MIN_DURATION =
+            "android.localenotification.duration.threshold";
+
+    private static NotificationController sInstance = null;
+
+    private final LocaleNotificationDataManager mDataManager;
+
+    /**
+     * Get {@link NotificationController} instance.
+     *
+     * @param context The context
+     * @return {@link NotificationController} instance
+     */
+    public static synchronized NotificationController getInstance(@NonNull Context context) {
+        if (sInstance == null) {
+            sInstance = new NotificationController(context);
+        }
+        return sInstance;
+    }
+
+    private NotificationController(Context context) {
+        mDataManager = new LocaleNotificationDataManager(context);
+    }
+
+    @VisibleForTesting
+    LocaleNotificationDataManager getDataManager() {
+        return mDataManager;
+    }
+
+    /**
+     * Increment the dismissCount of the notification.
+     *
+     * @param locale A locale used to query the {@link NotificationInfo}
+     */
+    public void incrementDismissCount(@NonNull String locale) {
+        NotificationInfo currentInfo = mDataManager.getNotificationInfo(locale);
+        NotificationInfo newInfo = new NotificationInfo(currentInfo.getUidCollection(),
+                currentInfo.getNotificationCount(),
+                currentInfo.getDismissCount() + 1,
+                currentInfo.getLastNotificationTimeMs(),
+                currentInfo.getNotificationId());
+        mDataManager.putNotificationInfo(locale, newInfo);
+    }
+
+    /**
+     * Whether the notification can be triggered or not.
+     *
+     * @param uid     The application's uid.
+     * @param locale  The application's locale which the user updated to.
+     * @return true if the notification needs to be triggered. Otherwise, false.
+     */
+    public boolean shouldTriggerNotification(int uid, @NonNull String locale) {
+        if (LocaleUtils.isInSystemLocale(locale)) {
+            return false;
+        } else {
+            // Add the uid into the locale's uid list and update the notification count if the
+            // notification can be triggered.
+            return updateLocaleNotificationInfo(uid, locale);
+        }
+    }
+
+    /**
+     * Get the notification id
+     *
+     * @param locale The locale which the application sets to
+     * @return the notification id
+     */
+    public int getNotificationId(@NonNull String locale) {
+        NotificationInfo info = mDataManager.getNotificationInfo(locale);
+        return (info != null) ? info.getNotificationId() : -1;
+    }
+
+    private boolean updateLocaleNotificationInfo(int uid, String locale) {
+        NotificationInfo info = mDataManager.getNotificationInfo(locale);
+        if (info == null) {
+            // Create an empty record with the uid and update the SharedPreference.
+            NotificationInfo emptyInfo = new NotificationInfo(Set.of(uid), 0, 0, 0, 0);
+            mDataManager.putNotificationInfo(locale, emptyInfo);
+            return false;
+        }
+        Set uidCollection = info.getUidCollection();
+        if (uidCollection.contains(uid)) {
+            return false;
+        }
+
+        NotificationInfo newInfo =
+                createNotificationInfoWithNewUidAndCount(uidCollection, uid, info);
+        mDataManager.putNotificationInfo(locale, newInfo);
+        return newInfo.getNotificationCount() > info.getNotificationCount();
+    }
+
+    private NotificationInfo createNotificationInfoWithNewUidAndCount(
+            Set<Integer> uidSet, int uid, NotificationInfo info) {
+        int dismissCount = info.getDismissCount();
+        int notificationCount = info.getNotificationCount();
+        long lastNotificationTime = info.getLastNotificationTimeMs();
+        int notificationId = info.getNotificationId();
+
+        // Add the uid into the locale's uid list
+        uidSet.add(uid);
+        if (dismissCount < DISMISS_COUNT_THRESHOLD
+                && notificationCount < NOTIFICATION_COUNT_THRESHOLD
+                // Notification should fire on multiples of 2 apps using the locale.
+                && uidSet.size() % MULTIPLE_BASE == 0
+                && !isNotificationFrequent(lastNotificationTime)) {
+            // Increment the count because the notification can be triggered.
+            notificationCount = info.getNotificationCount() + 1;
+            lastNotificationTime = Calendar.getInstance().getTimeInMillis();
+            Log.i(TAG, "notificationCount:" + notificationCount);
+            if (notificationCount == 1) {
+                notificationId = (int) SystemClock.uptimeMillis();
+            }
+        }
+        return new NotificationInfo(uidSet, notificationCount, dismissCount, lastNotificationTime,
+                notificationId);
+    }
+
+    /**
+     * Evaluates if the notification is triggered frequently.
+     *
+     * @param lastNotificationTime The timestamp that the last notification was triggered.
+     * @return true if the duration of the two continuous notifications is smaller than the
+     * threshold.
+     * Otherwise, false.
+     */
+    private boolean isNotificationFrequent(long lastNotificationTime) {
+        Calendar time = Calendar.getInstance();
+        int threshold = SystemProperties.getInt(PROPERTY_MIN_DURATION,
+                MIN_DURATION_BETWEEN_NOTIFICATIONS_MIN);
+        time.add(Calendar.MINUTE, threshold * -1);
+        return time.getTimeInMillis() < lastNotificationTime;
+    }
+}

src/com/android/settings/localepicker/NotificationInfo.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.localepicker;
+
+import java.util.Objects;
+import java.util.Set;
+
+class NotificationInfo {
+    private Set<Integer> mUidCollection;
+    private int mNotificationCount;
+    private int mDismissCount;
+    private long mLastNotificationTimeMs;
+    private int mNotificationId;
+
+    private NotificationInfo() {
+    }
+
+    NotificationInfo(Set<Integer> uidCollection, int notificationCount, int dismissCount,
+            long lastNotificationTimeMs, int notificationId) {
+        this.mUidCollection = uidCollection;
+        this.mNotificationCount = notificationCount;
+        this.mDismissCount = dismissCount;
+        this.mLastNotificationTimeMs = lastNotificationTimeMs;
+        this.mNotificationId = notificationId;
+    }
+
+    public Set<Integer> getUidCollection() {
+        return mUidCollection;
+    }
+
+    public int getNotificationCount() {
+        return mNotificationCount;
+    }
+
+    public int getDismissCount() {
+        return mDismissCount;
+    }
+
+    public long getLastNotificationTimeMs() {
+        return mLastNotificationTimeMs;
+    }
+
+    public int getNotificationId() {
+        return mNotificationId;
+    }
+
+    public void setUidCollection(Set<Integer> uidCollection) {
+        this.mUidCollection = uidCollection;
+    }
+
+    public void setNotificationCount(int notificationCount) {
+        this.mNotificationCount = notificationCount;
+    }
+
+    public void setDismissCount(int dismissCount) {
+        this.mDismissCount = dismissCount;
+    }
+
+    public void setLastNotificationTimeMs(long lastNotificationTimeMs) {
+        this.mLastNotificationTimeMs = lastNotificationTimeMs;
+    }
+
+    public void setNotificationId(int notificationId) {
+        this.mNotificationId = notificationId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == null) return false;
+        if (this == o) return true;
+        if (!(o instanceof NotificationInfo)) return false;
+        NotificationInfo that = (NotificationInfo) o;
+        return (mUidCollection.equals(that.mUidCollection))
+                && (mDismissCount == that.mDismissCount)
+                && (mNotificationCount == that.mNotificationCount)
+                && (mLastNotificationTimeMs == that.mLastNotificationTimeMs)
+                && (mNotificationId == that.mNotificationId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mUidCollection, mDismissCount, mNotificationCount,
+                mLastNotificationTimeMs, mNotificationId);
+    }
+}