Use flag to control the hierarchy tree changes

This change includes these:
1. App languages
2.Regional preferences
2-1. Temperature
2-2. First day of week
2-3. Numbering system
3. Terms of address

Bug: 379962955
Flag: com.android.settings.flags.regional_preferences_api_enabled
Test: check hsv and atest TermsOfAddressCategoryControllerTest,
FirstDayOfWeekControllerTest, NumberingSystemControllerTest, TemperatureUnitControllerTest
Change-Id: I9ae376f24ac4d1cf9a186ad3d77b539ac4b83642

Change-Id: I1b2f508f618fba94e67b5f8b102620837a6dda1c

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

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2024 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.LocaleList;
+
+import androidx.annotation.NonNull;
+
+import com.android.internal.app.LocaleStore;
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.flags.Flags;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+
+public class NewTermsOfAddressController extends BasePreferenceController {
+
+    public NewTermsOfAddressController(@NonNull Context context, @NonNull String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (Flags.regionalPreferencesApiEnabled()) {
+            if (Flags.termsOfAddressEnabled()) {
+                return checkAvailabilityStatus();
+            }
+        }
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+
+    private int checkAvailabilityStatus() {
+        // If language is not available for system language, or if ToA does not apply to
+        // system language, we will hide it.
+        final Locale defaultLocale = Locale.getDefault();
+        LocaleStore.LocaleInfo localeInfo = LocaleStore.getLocaleInfo(defaultLocale);
+        final List<String> supportedLanguageList = Arrays.asList(
+                mContext.getResources().getStringArray(
+                    R.array.terms_of_address_supported_languages));
+        final List<String> notSupportedLocaleList = Arrays.asList(
+                mContext.getResources().getStringArray(
+                    R.array.terms_of_address_unsupported_locales));
+
+        final Locale locale = localeInfo.getLocale().stripExtensions();
+        final String language = locale.getLanguage();
+        final String localeTag = locale.toLanguageTag();
+
+        // Supported locales:
+        // 1. All French is supported except fr-CA.
+        // 2. QA language en-XA (LTR pseudo locale), ar_XB (RTL pseudo locale).
+        if ((supportedLanguageList.contains(language)
+                && !notSupportedLocaleList.contains(localeTag))
+                || LocaleList.isPseudoLocale(locale)) {
+            return AVAILABLE;
+        }
+
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+}