1/*
2 * Copyright (C) 2008 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
17package com.android.providers.settings;
18
19import java.util.Locale;
20
21import android.app.ActivityManagerNative;
22import android.app.IActivityManager;
23import android.app.backup.IBackupManager;
24import android.content.Context;
25import android.content.res.Configuration;
26import android.location.LocationManager;
27import android.media.AudioManager;
28import android.os.IPowerManager;
29import android.os.RemoteException;
30import android.os.ServiceManager;
31import android.provider.Settings;
32import android.text.TextUtils;
33
34public class SettingsHelper {
35    private Context mContext;
36    private AudioManager mAudioManager;
37
38    public SettingsHelper(Context context) {
39        mContext = context;
40        mAudioManager = (AudioManager) context
41                .getSystemService(Context.AUDIO_SERVICE);
42    }
43
44    /**
45     * Sets the property via a call to the appropriate API, if any, and returns
46     * whether or not the setting should be saved to the database as well.
47     * @param name the name of the setting
48     * @param value the string value of the setting
49     * @return whether to continue with writing the value to the database. In
50     * some cases the data will be written by the call to the appropriate API,
51     * and in some cases the property value needs to be modified before setting.
52     */
53    public boolean restoreValue(String name, String value) {
54        if (Settings.System.SCREEN_BRIGHTNESS.equals(name)) {
55            setBrightness(Integer.parseInt(value));
56        } else if (Settings.System.SOUND_EFFECTS_ENABLED.equals(name)) {
57            setSoundEffects(Integer.parseInt(value) == 1);
58        } else if (Settings.Secure.LOCATION_PROVIDERS_ALLOWED.equals(name)) {
59            setGpsLocation(value);
60            return false;
61        } else if (Settings.Secure.BACKUP_AUTO_RESTORE.equals(name)) {
62            setAutoRestore(Integer.parseInt(value) == 1);
63        } else if (isAlreadyConfiguredCriticalAccessibilitySetting(name)) {
64            return false;
65        }
66        return true;
67    }
68
69    private boolean isAlreadyConfiguredCriticalAccessibilitySetting(String name) {
70        // These are the critical accessibility settings that are required for a
71        // blind user to be able to interact with the device. If these settings are
72        // already configured, we will not overwrite them. If they are already set,
73        // it means that the user has performed a global gesture to enable accessibility
74        // and definitely needs these features working after the restore.
75        if (Settings.Secure.ACCESSIBILITY_ENABLED.equals(name)
76                || Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION.equals(name)
77                || Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD.equals(name)
78                || Settings.Secure.TOUCH_EXPLORATION_ENABLED.equals(name)) {
79            return Settings.Secure.getInt(mContext.getContentResolver(), name, 0) != 0;
80        } else if (Settings.Secure.TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES.equals(name)
81                || Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES.equals(name)) {
82            return !TextUtils.isEmpty(Settings.Secure.getString(
83                    mContext.getContentResolver(), name));
84        }
85        return false;
86    }
87
88    private void setAutoRestore(boolean enabled) {
89        try {
90            IBackupManager bm = IBackupManager.Stub.asInterface(
91                    ServiceManager.getService(Context.BACKUP_SERVICE));
92            if (bm != null) {
93                bm.setAutoRestore(enabled);
94            }
95        } catch (RemoteException e) {}
96    }
97
98    private void setGpsLocation(String value) {
99        final String GPS = LocationManager.GPS_PROVIDER;
100        boolean enabled =
101                GPS.equals(value) ||
102                value.startsWith(GPS + ",") ||
103                value.endsWith("," + GPS) ||
104                value.contains("," + GPS + ",");
105        Settings.Secure.setLocationProviderEnabled(
106                mContext.getContentResolver(), GPS, enabled);
107    }
108
109    private void setSoundEffects(boolean enable) {
110        if (enable) {
111            mAudioManager.loadSoundEffects();
112        } else {
113            mAudioManager.unloadSoundEffects();
114        }
115    }
116
117    private void setBrightness(int brightness) {
118        try {
119            IPowerManager power = IPowerManager.Stub.asInterface(
120                    ServiceManager.getService("power"));
121            if (power != null) {
122                power.setTemporaryScreenBrightnessSettingOverride(brightness);
123            }
124        } catch (RemoteException doe) {
125
126        }
127    }
128
129    byte[] getLocaleData() {
130        Configuration conf = mContext.getResources().getConfiguration();
131        final Locale loc = conf.locale;
132        String localeString = loc.getLanguage();
133        String country = loc.getCountry();
134        if (!TextUtils.isEmpty(country)) {
135            localeString += "_" + country;
136        }
137        return localeString.getBytes();
138    }
139
140    /**
141     * Sets the locale specified. Input data is the equivalent of "ll_cc".getBytes(), where
142     * "ll" is the language code and "cc" is the country code.
143     * @param data the locale string in bytes.
144     */
145    void setLocaleData(byte[] data, int size) {
146        // Check if locale was set by the user:
147        Configuration conf = mContext.getResources().getConfiguration();
148        Locale loc = conf.locale;
149        // TODO: The following is not working as intended because the network is forcing a locale
150        // change after registering. Need to find some other way to detect if the user manually
151        // changed the locale
152        if (conf.userSetLocale) return; // Don't change if user set it in the SetupWizard
153
154        final String[] availableLocales = mContext.getAssets().getLocales();
155        String localeCode = new String(data, 0, size);
156        String language = new String(data, 0, 2);
157        String country = size > 4 ? new String(data, 3, 2) : "";
158        loc = null;
159        for (int i = 0; i < availableLocales.length; i++) {
160            if (availableLocales[i].equals(localeCode)) {
161                loc = new Locale(language, country);
162                break;
163            }
164        }
165        if (loc == null) return; // Couldn't find the saved locale in this version of the software
166
167        try {
168            IActivityManager am = ActivityManagerNative.getDefault();
169            Configuration config = am.getConfiguration();
170            config.locale = loc;
171            // indicate this isn't some passing default - the user wants this remembered
172            config.userSetLocale = true;
173
174            am.updateConfiguration(config);
175        } catch (RemoteException e) {
176            // Intentionally left blank
177        }
178    }
179
180    /**
181     * Informs the audio service of changes to the settings so that
182     * they can be re-read and applied.
183     */
184    void applyAudioSettings() {
185        AudioManager am = new AudioManager(mContext);
186        am.reloadAudioSettings();
187    }
188}
189