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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.app.ActivityManager;
     20 import android.content.Context;
     21 import android.database.ContentObserver;
     22 import android.os.Handler;
     23 import android.provider.Settings.Secure;
     24 
     25 import com.android.systemui.statusbar.policy.Listenable;
     26 
     27 /** Helper for managing a secure setting. **/
     28 public abstract class SecureSetting extends ContentObserver implements Listenable {
     29     private static final int DEFAULT = 0;
     30 
     31     private final Context mContext;
     32     private final String mSettingName;
     33 
     34     private boolean mListening;
     35     private int mUserId;
     36     private int mObservedValue = DEFAULT;
     37 
     38     protected abstract void handleValueChanged(int value, boolean observedChange);
     39 
     40     public SecureSetting(Context context, Handler handler, String settingName) {
     41         super(handler);
     42         mContext = context;
     43         mSettingName = settingName;
     44         mUserId = ActivityManager.getCurrentUser();
     45     }
     46 
     47     public int getValue() {
     48         return Secure.getIntForUser(mContext.getContentResolver(), mSettingName, DEFAULT, mUserId);
     49     }
     50 
     51     public void setValue(int value) {
     52         Secure.putIntForUser(mContext.getContentResolver(), mSettingName, value, mUserId);
     53     }
     54 
     55     @Override
     56     public void setListening(boolean listening) {
     57         if (listening == mListening) return;
     58         mListening = listening;
     59         if (listening) {
     60             mObservedValue = getValue();
     61             mContext.getContentResolver().registerContentObserver(
     62                     Secure.getUriFor(mSettingName), false, this, mUserId);
     63         } else {
     64             mContext.getContentResolver().unregisterContentObserver(this);
     65             mObservedValue = DEFAULT;
     66         }
     67     }
     68 
     69     @Override
     70     public void onChange(boolean selfChange) {
     71         final int value = getValue();
     72         handleValueChanged(value, value != mObservedValue);
     73         mObservedValue = value;
     74     }
     75 
     76     public void setUserId(int userId) {
     77         mUserId = userId;
     78         if (mListening) {
     79             setListening(false);
     80             setListening(true);
     81         }
     82     }
     83 }
     84