Remove Numbering System preference if no corresponding locale.

- If locale has no multiple numbering systems, it shall not
   show the locale on list.
 - If there is no locale with numberung system, remove the entry of
   numbering system preference on UI.

Bug: b/274053189
Test: atest passed
Test: Manual test passed
Change-Id: If61c7e233630644e2d6245c5efd75d15d52cf94b

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

@@ -27,9 +27,19 @@ public class LocaleFeatureProviderImpl implements LocaleFeatureProvider {
     @Override
     public String getLocaleNames() {
         final LocaleList locales = LocalePicker.getLocales();
-        Locale[] arrLocalesWithoutExtension = new Locale[locales.size()];
+        return getLocaleNames(locales);
-        for (int i = 0; i < locales.size(); i++) {
+    }
-            arrLocalesWithoutExtension[i] = locales.get(i).stripExtensions();
+
+    /**
+     * Returns displayable string of inputted locales.
+     */
+    public String getLocaleNames(LocaleList inputLocales) {
+        if (inputLocales.isEmpty()) {
+            return "";
+        }
+        Locale[] arrLocalesWithoutExtension = new Locale[inputLocales.size()];
+        for (int i = 0; i < inputLocales.size(); i++) {
+            arrLocalesWithoutExtension[i] = inputLocales.get(i).stripExtensions();
         }
         final Locale displayLocale = Locale.getDefault();
         return LocaleHelper.toSentenceCase(

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

@@ -17,16 +17,26 @@
 package com.android.settings.regionalpreferences;
 
 import android.content.Context;
+import android.os.LocaleList;
 
+import com.android.internal.app.LocaleStore;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settings.localepicker.LocaleFeatureProviderImpl;
 
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Set;
+
 /** A controller for the entry of Numbering System's page */
 public class NumberingSystemController extends BasePreferenceController {
     private static final String TAG = NumberingSystemController.class.getSimpleName();
 
+    private LocaleList mLocaleList;
     public NumberingSystemController(Context context, String preferenceKey) {
         super(context, preferenceKey);
+        // Initialize the supported languages to LocaleInfos
+        LocaleStore.fillCache(context);
+        mLocaleList = getNumberingSystemLocale();
     }
 
     /**
@@ -42,11 +52,31 @@ public class NumberingSystemController extends BasePreferenceController {
      */
     @Override
     public int getAvailabilityStatus() {
-        return AVAILABLE;
+        return mLocaleList.isEmpty() ? CONDITIONALLY_UNAVAILABLE : AVAILABLE;
+    }
+
+    private static LocaleList getNumberingSystemLocale() {
+        LocaleList localeList = LocaleList.getDefault();
+        Set<Locale> localesHasNumberingSystems = new HashSet<>();
+        for (int i = 0; i < localeList.size(); i++) {
+            Locale locale = localeList.get(i);
+            LocaleStore.LocaleInfo localeInfo = LocaleStore.getLocaleInfo(locale);
+            if (localeInfo.hasNumberingSystems()) {
+                localesHasNumberingSystems.add(locale);
+            }
+        }
+        return convertToLocaleList(localesHasNumberingSystems);
+    }
+
+    private static LocaleList convertToLocaleList(Set<Locale> locales) {
+        if (locales.isEmpty()) {
+            return LocaleList.getEmptyLocaleList();
+        }
+        return new LocaleList(locales.stream().toArray(Locale[]::new));
     }
 
     @Override
     public CharSequence getSummary() {
-        return new LocaleFeatureProviderImpl().getLocaleNames();
+        return new LocaleFeatureProviderImpl().getLocaleNames(getNumberingSystemLocale());
     }
 }

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

@@ -30,6 +30,7 @@ import androidx.preference.PreferenceScreen;
 
 import com.android.internal.app.LocaleHelper;
 import com.android.internal.app.LocalePicker;
+import com.android.internal.app.LocaleStore;
 import com.android.settings.core.BasePreferenceController;
 import com.android.settings.core.SubSettingLauncher;
 import com.android.settings.dashboard.DashboardFragment;
@@ -52,6 +53,8 @@ public class NumberingSystemItemController extends BasePreferenceController {
 
     public NumberingSystemItemController(Context context, Bundle argument) {
         super(context, "no_key");
+        // Initialize the supported languages to LocaleInfos
+        LocaleStore.fillCache(context);
         mOption = argument.getString(
                 RegionalPreferencesEntriesFragment.ARG_KEY_REGIONAL_PREFERENCE, "");
         mSelectedLanguage = argument.getString(
@@ -111,8 +114,12 @@ public class NumberingSystemItemController extends BasePreferenceController {
         // Get current system language list to show on screen.
         LocaleList localeList = LocaleList.getDefault();
         for (int i = 0; i < localeList.size(); i++) {
-            Preference pref = new Preference(mContext);
             Locale locale = localeList.get(i);
+            LocaleStore.LocaleInfo localeInfo = LocaleStore.getLocaleInfo(locale);
+            if (!localeInfo.hasNumberingSystems()) {
+                continue;
+            }
+            Preference pref = new Preference(mContext);
             pref.setTitle(LocaleHelper.getDisplayName(locale.stripExtensions(), locale, true));
             pref.setKey(locale.toLanguageTag());
             pref.setSummary(getNumberingSystem(locale));

tests/unit/src/com/android/settings/regionalpreferences/NumberingPreferencesFragmentTest.java

@@ -19,18 +19,15 @@ package com.android.settings.regionalpreferences;
 import static org.junit.Assert.assertEquals;
 
 import android.app.settings.SettingsEnums;
-import android.content.Context;
 import android.os.Bundle;
 import android.os.Looper;
 
 import androidx.test.annotation.UiThreadTest;
-import androidx.test.core.app.ApplicationProvider;
 
 import org.junit.Before;
 import org.junit.Test;
 
 public class NumberingPreferencesFragmentTest {
-    private Context mApplicationContext;
     private NumberingPreferencesFragment mFragment;
 
     @Before
@@ -39,7 +36,6 @@ public class NumberingPreferencesFragmentTest {
         if (Looper.myLooper() == null) {
             Looper.prepare();
         }
-        mApplicationContext = ApplicationProvider.getApplicationContext();
         mFragment = new NumberingPreferencesFragment();
     }
 

tests/unit/src/com/android/settings/regionalpreferences/NumberingSystemControllerTest.java

@@ -0,0 +1,61 @@
+/*
+ * 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.regionalpreferences;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.CONDITIONALLY_UNAVAILABLE;
+
+import static org.junit.Assert.assertEquals;
+
+import android.content.Context;
+import android.os.LocaleList;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class NumberingSystemControllerTest {
+    private Context mApplicationContext;
+    private NumberingSystemController mController;
+
+    @Before
+    public void setUp() throws Exception {
+        mApplicationContext = ApplicationProvider.getApplicationContext();
+    }
+
+    @Test
+    public void getAvailabilityStatus_noLocale_unavailable() {
+        LocaleList.setDefault(LocaleList.forLanguageTags("en-US,zh-Hant-TW"));
+        mController = new NumberingSystemController(mApplicationContext, "key");
+
+        int result = mController.getAvailabilityStatus();
+
+        assertEquals(CONDITIONALLY_UNAVAILABLE, result);
+    }
+
+    @Test
+    public void getAvailabilityStatus_hasLocaleWithNumberingSystems_available() {
+        // ar-JO has different numbering system.
+        LocaleList.setDefault(LocaleList.forLanguageTags("en-US,zh-Hant-TW,ar-JO"));
+        mController = new NumberingSystemController(mApplicationContext, "key");
+
+        int result = mController.getAvailabilityStatus();
+
+        assertEquals(AVAILABLE, result);
+    }
+}

tests/unit/src/com/android/settings/regionalpreferences/NumberingSystemItemControllerTest.java

@@ -111,7 +111,7 @@ public class NumberingSystemItemControllerTest {
 
     @Test
     @UiThreadTest
-    public void displayPreference_languageOptAndHas2Locale_show2Options() {
+    public void displayPreference_languageOptAndHas2LocaleWithSingleNu_showNothing() {
         LocaleList.setDefault(LocaleList.forLanguageTags("en-US,zh-TW"));
         Bundle bundle = new Bundle();
         bundle.putString(RegionalPreferencesEntriesFragment.ARG_KEY_REGIONAL_PREFERENCE,
@@ -123,7 +123,25 @@ public class NumberingSystemItemControllerTest {
 
         mController.displayPreference(mPreferenceScreen);
 
-        assertEquals(LocaleList.getDefault().size(), mPreferenceScreen.getPreferenceCount());
+        assertEquals(0, mPreferenceScreen.getPreferenceCount());
+    }
+
+    @Test
+    @UiThreadTest
+    public void displayPreference_languageOptAndHas2LocaleWithMultiNu_showLocaleWithMultiNuOnly() {
+        // ar-JO and dz-BT have multiple numbering systems.
+        LocaleList.setDefault(LocaleList.forLanguageTags("en-US,zh-TW,ar-JO,dz-BT"));
+        Bundle bundle = new Bundle();
+        bundle.putString(RegionalPreferencesEntriesFragment.ARG_KEY_REGIONAL_PREFERENCE,
+                NumberingSystemItemController.ARG_VALUE_LANGUAGE_SELECT);
+        bundle.putString(
+                NumberingSystemItemController.KEY_SELECTED_LANGUAGE, Locale.US.toLanguageTag());
+        mController = new NumberingSystemItemController(mApplicationContext, bundle);
+        mController.setParentFragment(mFragment);
+
+        mController.displayPreference(mPreferenceScreen);
+
+        assertEquals(2, mPreferenceScreen.getPreferenceCount());
     }
 
     @Test