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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.tv.settings.system;
     18 
     19 import android.app.ActivityManagerNative;
     20 import android.content.Context;
     21 import android.os.Bundle;
     22 import android.os.Handler;
     23 import android.os.RemoteException;
     24 import android.provider.Settings;
     25 import android.support.v17.preference.LeanbackPreferenceFragment;
     26 import android.support.v7.preference.Preference;
     27 import android.support.v7.preference.PreferenceScreen;
     28 import android.util.ArrayMap;
     29 import android.util.Log;
     30 
     31 import com.android.internal.app.LocalePicker;
     32 import com.android.tv.settings.R;
     33 import com.android.tv.settings.RadioPreference;
     34 
     35 import java.util.List;
     36 import java.util.Locale;
     37 import java.util.Map;
     38 
     39 public class LanguageFragment extends LeanbackPreferenceFragment {
     40     private static final String TAG = "LanguageFragment";
     41 
     42     private static final String LANGUAGE_RADIO_GROUP = "language";
     43 
     44     private final Map<String, LocalePicker.LocaleInfo> mLocaleInfoMap = new ArrayMap<>();
     45 
     46     // Adjust this value to keep things relatively responsive without janking animations
     47     private static final int LANGUAGE_SET_DELAY_MS = 500;
     48     private final Handler mDelayHandler = new Handler();
     49     private Locale mNewLocale;
     50     private final Runnable mSetLanguageRunnable = new Runnable() {
     51         @Override
     52         public void run() {
     53             LocalePicker.updateLocale(mNewLocale);
     54         }
     55     };
     56 
     57     public static LanguageFragment newInstance() {
     58         return new LanguageFragment();
     59     }
     60 
     61     @Override
     62     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
     63         final Context themedContext = getPreferenceManager().getContext();
     64         final PreferenceScreen screen =
     65                 getPreferenceManager().createPreferenceScreen(themedContext);
     66         screen.setTitle(R.string.system_language);
     67 
     68         Locale currentLocale = null;
     69         try {
     70             currentLocale = ActivityManagerNative.getDefault().getConfiguration()
     71                     .getLocales().get(0);
     72         } catch (RemoteException e) {
     73             Log.e(TAG, "Could not retrieve locale", e);
     74         }
     75 
     76         final boolean isInDeveloperMode = Settings.Global.getInt(themedContext.getContentResolver(),
     77                 Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) != 0;
     78 
     79         final List<LocalePicker.LocaleInfo> localeInfoList =
     80                 LocalePicker.getAllAssetLocales(themedContext, isInDeveloperMode);
     81 
     82         Preference activePref = null;
     83         for (final LocalePicker.LocaleInfo localeInfo : localeInfoList) {
     84             final String languageTag = localeInfo.getLocale().toLanguageTag();
     85             mLocaleInfoMap.put(languageTag, localeInfo);
     86 
     87             final RadioPreference radioPreference = new RadioPreference(themedContext);
     88             radioPreference.setKey(languageTag);
     89             radioPreference.setPersistent(false);
     90             radioPreference.setTitle(localeInfo.getLabel());
     91             radioPreference.setRadioGroup(LANGUAGE_RADIO_GROUP);
     92             radioPreference.setLayoutResource(R.layout.preference_reversed_widget);
     93 
     94             if (localeInfo.getLocale().equals(currentLocale)) {
     95                 radioPreference.setChecked(true);
     96                 activePref = radioPreference;
     97             }
     98 
     99             screen.addPreference(radioPreference);
    100         }
    101 
    102         if (activePref != null && savedInstanceState == null) {
    103             scrollToPreference(activePref);
    104         }
    105 
    106         setPreferenceScreen(screen);
    107     }
    108 
    109     @Override
    110     public boolean onPreferenceTreeClick(Preference preference) {
    111         if (preference instanceof RadioPreference) {
    112             final RadioPreference radioPreference = (RadioPreference) preference;
    113             radioPreference.clearOtherRadioPreferences(getPreferenceScreen());
    114             if (radioPreference.isChecked()) {
    115                 mNewLocale = mLocaleInfoMap.get(radioPreference.getKey()).getLocale();
    116                 mDelayHandler.removeCallbacks(mSetLanguageRunnable);
    117                 mDelayHandler.postDelayed(mSetLanguageRunnable, LANGUAGE_SET_DELAY_MS);
    118             } else {
    119                 radioPreference.setChecked(true);
    120             }
    121         }
    122         return super.onPreferenceTreeClick(preference);
    123     }
    124 }
    125