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      1 /*
      2  * Copyright (C) 2014 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.systemui.qs;
     18 
     19 import android.content.Context;
     20 import android.database.ContentObserver;
     21 import android.os.Handler;
     22 import android.provider.Settings.Global;
     23 
     24 import com.android.systemui.statusbar.policy.Listenable;
     25 
     26 /** Helper for managing a global setting. **/
     27 public abstract class GlobalSetting extends ContentObserver implements Listenable {
     28     private final Context mContext;
     29     private final String mSettingName;
     30 
     31     protected abstract void handleValueChanged(int value);
     32 
     33     public GlobalSetting(Context context, Handler handler, String settingName) {
     34         super(handler);
     35         mContext = context;
     36         mSettingName = settingName;
     37     }
     38 
     39     public int getValue() {
     40         return Global.getInt(mContext.getContentResolver(), mSettingName, 0);
     41     }
     42 
     43     public void setValue(int value) {
     44         Global.putInt(mContext.getContentResolver(), mSettingName, value);
     45     }
     46 
     47     @Override
     48     public void setListening(boolean listening) {
     49         if (listening) {
     50             mContext.getContentResolver().registerContentObserver(
     51                     Global.getUriFor(mSettingName), false, this);
     52         } else {
     53             mContext.getContentResolver().unregisterContentObserver(this);
     54         }
     55     }
     56 
     57     @Override
     58     public void onChange(boolean selfChange) {
     59         handleValueChanged(getValue());
     60     }
     61 }
     62