[Regional Preference] Add each option entry

- Add a entry in langauge and input page
 - Add new page for the options of Temperature unit, calendar type,
   first day of week, and numbering system.

Bug: b/246929960
Test: atest pass
Test: Manual test pass
Change-Id: I69377fe9cd6dcd7a27c933a8dc98483df3da7665

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

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2022 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.icu.text.NumberingSystem;
+import android.provider.Settings;
+import android.text.TextUtils;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.Locale;
+
+/** A controller for the entry of Numbering System's page */
+public class NumberingSystemController extends BasePreferenceController {
+    private static final String UNICODE_EXTENSION_NUMBERING_SYSTEM = "nu";
+
+    public NumberingSystemController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    /**
+     * @return {@link AvailabilityStatus} for the Setting. This status is used to determine if the
+     * Setting should be shown or disabled in Settings. Further, it can be used to produce
+     * appropriate error / warning Slice in the case of unavailability.
+     * </p>
+     * The status is used for the convenience methods: {@link #isAvailable()}, {@link
+     * #isSupported()}
+     * </p>
+     * The inherited class doesn't need to check work profile if android:forWork="true" is set in
+     * preference xml.
+     */
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        String record = Settings.System.getString(
+                mContext.getContentResolver(), Settings.System.LOCALE_PREFERENCES);
+        String result = "";
+        if (!TextUtils.isEmpty(record)) {
+            result = Locale.forLanguageTag(record)
+                    .getUnicodeLocaleType(UNICODE_EXTENSION_NUMBERING_SYSTEM);
+        }
+
+        if (TextUtils.isEmpty(result)) {
+            result = Locale.getDefault(Locale.Category.FORMAT)
+                    .getUnicodeLocaleType(UNICODE_EXTENSION_NUMBERING_SYSTEM);
+            if (TextUtils.isEmpty(result)) {
+                return mContext.getString(R.string.default_string_of_regional_preference);
+            }
+        }
+
+        Locale locale = new Locale.Builder()
+                .setUnicodeLocaleKeyword(UNICODE_EXTENSION_NUMBERING_SYSTEM, result)
+                .build();
+        return NumberingSystem.getInstance(locale).getName();
+    }
+}