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.ActivityManager;
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 
newInstance()57     public static LanguageFragment newInstance() {
58         return new LanguageFragment();
59     }
60 
61     @Override
onCreatePreferences(Bundle savedInstanceState, String rootKey)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 = ActivityManager.getService().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
onPreferenceTreeClick(Preference preference)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