Add captioning preferences screen

BUG: 9926077
Change-Id: Iea141d5d6fd0e4f134c36c51d89830b3c31abd09

src/com/android/settings/accessibility/AccessibilityUtils.java

@@ -1,37 +1,77 @@
+/*
+ * Copyright (C) 2013 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.accessibility;
 
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.res.Configuration;
+import android.content.res.Resources;
 import android.provider.Settings;
-import android.provider.Settings.Secure;
 import android.text.TextUtils.SimpleStringSplitter;
 
+import java.util.Collections;
 import java.util.HashSet;
+import java.util.Locale;
 import java.util.Set;
 
 /**
- * TODO: Insert description here. (generated by alanv)
+ * Utility methods used within accessibility settings.
  */
-public class AccessibilityUtils {
-
+class AccessibilityUtils {
+    /**
+     * @return the set of enabled accessibility services
+     */
     static Set<ComponentName> getEnabledServicesFromSettings(Context context) {
-        String enabledServicesSetting = Settings.Secure.getString(context.getContentResolver(),
-                Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES);
+        final String enabledServicesSetting = Settings.Secure.getString(
+                context.getContentResolver(), Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES);
         if (enabledServicesSetting == null) {
-            enabledServicesSetting = "";
+            return Collections.emptySet();
         }
-        Set<ComponentName> enabledServices = new HashSet<ComponentName>();
-        SimpleStringSplitter colonSplitter = AccessibilitySettings.sStringColonSplitter;
+
+        final Set<ComponentName> enabledServices = new HashSet<ComponentName>();
+        final SimpleStringSplitter colonSplitter = AccessibilitySettings.sStringColonSplitter;
         colonSplitter.setString(enabledServicesSetting);
+
         while (colonSplitter.hasNext()) {
-            String componentNameString = colonSplitter.next();
-            ComponentName enabledService = ComponentName.unflattenFromString(
+            final String componentNameString = colonSplitter.next();
+            final ComponentName enabledService = ComponentName.unflattenFromString(
                     componentNameString);
             if (enabledService != null) {
                 enabledServices.add(enabledService);
             }
         }
+
         return enabledServices;
     }
 
+    /**
+     * @return a localized version of the text resource specified by resId
+     */
+    static CharSequence getTextForLocale(Context context, Locale locale, int resId) {
+        final Resources res = context.getResources();
+        final Configuration config = res.getConfiguration();
+        final Locale prevLocale = config.locale;
+        try {
+            config.locale = locale;
+            res.updateConfiguration(config, null);
+            return res.getText(resId);
+        } finally {
+            config.locale = prevLocale;
+            res.updateConfiguration(config, null);
+        }
+    }
 }