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/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;
+    }
+}