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      1 /*
      2  * Copyright (C) 2016 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.settings.notification;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.database.ContentObserver;
     22 import android.net.Uri;
     23 import android.os.Handler;
     24 import android.provider.Settings;
     25 import android.support.v7.preference.Preference;
     26 import android.support.v7.preference.PreferenceScreen;
     27 import android.support.v7.preference.TwoStatePreference;
     28 import android.util.Log;
     29 
     30 import com.android.settings.core.PreferenceControllerMixin;
     31 import com.android.settingslib.core.AbstractPreferenceController;
     32 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     33 import com.android.settingslib.core.lifecycle.events.OnPause;
     34 import com.android.settingslib.core.lifecycle.events.OnResume;
     35 
     36 import static android.provider.Settings.System.NOTIFICATION_LIGHT_PULSE;
     37 
     38 public class PulseNotificationPreferenceController extends AbstractPreferenceController
     39         implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener,
     40         LifecycleObserver, OnResume, OnPause {
     41 
     42     private static final String TAG = "PulseNotifPrefContr";
     43     private static final String KEY_NOTIFICATION_PULSE = "notification_pulse";
     44     private SettingObserver mSettingObserver;
     45 
     46     public PulseNotificationPreferenceController(Context context) {
     47         super(context);
     48     }
     49 
     50     @Override
     51     public void displayPreference(PreferenceScreen screen) {
     52         super.displayPreference(screen);
     53         Preference preference = screen.findPreference(KEY_NOTIFICATION_PULSE);
     54         if (preference != null) {
     55             mSettingObserver = new SettingObserver(preference);
     56         }
     57     }
     58 
     59     @Override
     60     public void onResume() {
     61         if (mSettingObserver != null) {
     62             mSettingObserver.register(mContext.getContentResolver(), true /* register */);
     63         }
     64     }
     65 
     66     @Override
     67     public void onPause() {
     68         if (mSettingObserver != null) {
     69             mSettingObserver.register(mContext.getContentResolver(), false /* register */);
     70         }
     71     }
     72 
     73     @Override
     74     public String getPreferenceKey() {
     75         return KEY_NOTIFICATION_PULSE;
     76     }
     77 
     78     @Override
     79     public boolean isAvailable() {
     80         return mContext.getResources()
     81                 .getBoolean(com.android.internal.R.bool.config_intrusiveNotificationLed);
     82     }
     83 
     84     @Override
     85     public void updateState(Preference preference) {
     86         try {
     87             final boolean checked = Settings.System.getInt(mContext.getContentResolver(),
     88                     NOTIFICATION_LIGHT_PULSE) == 1;
     89             ((TwoStatePreference) preference).setChecked(checked);
     90         } catch (Settings.SettingNotFoundException snfe) {
     91             Log.e(TAG, NOTIFICATION_LIGHT_PULSE + " not found");
     92         }
     93     }
     94 
     95     @Override
     96     public boolean onPreferenceChange(Preference preference, Object newValue) {
     97         final boolean val = (Boolean) newValue;
     98         return Settings.System.putInt(mContext.getContentResolver(),
     99                 NOTIFICATION_LIGHT_PULSE, val ? 1 : 0);
    100     }
    101 
    102     class SettingObserver extends ContentObserver {
    103 
    104         private final Uri NOTIFICATION_LIGHT_PULSE_URI =
    105                 Settings.System.getUriFor(Settings.System.NOTIFICATION_LIGHT_PULSE);
    106 
    107         private final Preference mPreference;
    108 
    109         public SettingObserver(Preference preference) {
    110             super(new Handler());
    111             mPreference = preference;
    112         }
    113 
    114         public void register(ContentResolver cr, boolean register) {
    115             if (register) {
    116                 cr.registerContentObserver(NOTIFICATION_LIGHT_PULSE_URI, false, this);
    117             } else {
    118                 cr.unregisterContentObserver(this);
    119             }
    120         }
    121 
    122         @Override
    123         public void onChange(boolean selfChange, Uri uri) {
    124             super.onChange(selfChange, uri);
    125             if (NOTIFICATION_LIGHT_PULSE_URI.equals(uri)) {
    126                 updateState(mPreference);
    127             }
    128         }
    129     }
    130 }
    131