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 
handleValueChanged(int value, boolean observedChange)38     protected abstract void handleValueChanged(int value, boolean observedChange);
39 
SecureSetting(Context context, Handler handler, String settingName)40     public SecureSetting(Context context, Handler handler, String settingName) {
41         super(handler);
42         mContext = context;
43         mSettingName = settingName;
44         mUserId = ActivityManager.getCurrentUser();
45     }
46 
getValue()47     public int getValue() {
48         return Secure.getIntForUser(mContext.getContentResolver(), mSettingName, DEFAULT, mUserId);
49     }
50 
setValue(int value)51     public void setValue(int value) {
52         Secure.putIntForUser(mContext.getContentResolver(), mSettingName, value, mUserId);
53     }
54 
55     @Override
setListening(boolean listening)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
onChange(boolean selfChange)70     public void onChange(boolean selfChange) {
71         final int value = getValue();
72         handleValueChanged(value, value != mObservedValue);
73         mObservedValue = value;
74     }
75 
setUserId(int userId)76     public void setUserId(int userId) {
77         mUserId = userId;
78         if (mListening) {
79             setListening(false);
80             setListening(true);
81         }
82     }
83 }
84