Create a new region picker page

1. The region which is selected in region picker will also apply to the first locale.
2. When a user change the first locale, the region of the first locale will be updated to the region picker.

Bug: 385047778
Flag: com.android.settings.flags.regional_preferences_api_enabled
Test: check hsv
Change-Id: I001e0910ce9d1601513ed2f52e6ee30d3551859f

src/com/android/settings/regionalpreferences/RegionPickerFragment.java

@@ -0,0 +1,93 @@
+/*
+ * 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.regionalpreferences;
+
+import android.content.Context;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+
+import com.android.internal.app.LocaleStore;
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.flags.Flags;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+public class RegionPickerFragment extends DashboardFragment{
+
+    private static final String TAG = "RegionPickerFragment";
+    private static final String KEY_PREFERENCE_SYSTEM_REGION_LIST = "system_region_list";
+    private static final String KEY_PREFERENCE_SYSTEM_REGION_SUGGESTED_LIST =
+            "system_region_suggested_list";
+
+    @Override
+    public void onCreate(@NonNull Bundle icicle) {
+        super.onCreate(icicle);
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.system_region_picker;
+    }
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return 0;
+    }
+
+    @Override
+    protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
+        return buildPreferenceControllers(context);
+    }
+
+    private List<AbstractPreferenceController> buildPreferenceControllers(
+            @NonNull Context context) {
+        Locale parentLocale = LocaleStore.getLocaleInfo(Locale.getDefault()).getParent();
+        LocaleStore.LocaleInfo parentLocaleInfo = LocaleStore.getLocaleInfo(parentLocale);
+        SystemRegionSuggestedListPreferenceController mSuggestedListPreferenceController =
+                new SystemRegionSuggestedListPreferenceController(
+                    context, KEY_PREFERENCE_SYSTEM_REGION_SUGGESTED_LIST, parentLocaleInfo);
+        SystemRegionAllListPreferenceController mSystemRegionAllListPreferenceController =
+                new SystemRegionAllListPreferenceController(
+                    context, KEY_PREFERENCE_SYSTEM_REGION_LIST, parentLocaleInfo);
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
+        controllers.add(mSuggestedListPreferenceController);
+        controllers.add(mSystemRegionAllListPreferenceController);
+        return controllers;
+    }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.system_region_picker) {
+                @Override
+                protected boolean isPageSearchEnabled(Context context) {
+                    if (!Flags.regionalPreferencesApiEnabled()) {
+                        return false;
+                    }
+                    return true;
+                }
+            };
+}