1 /*
2  * Copyright (C) 2017 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.launcher3.util;
18 
19 import android.content.ContentResolver;
20 import android.content.Context;
21 import android.database.ContentObserver;
22 import android.os.Handler;
23 import android.provider.Settings;
24 
25 /**
26  * Utility class to listen for secure settings changes
27  */
28 public class SecureSettingsObserver extends ContentObserver {
29 
30     /** Hidden field Settings.Secure.NOTIFICATION_BADGING */
31     public static final String NOTIFICATION_BADGING = "notification_badging";
32 
33     private final ContentResolver mResolver;
34     private final String mKeySetting;
35     private final int mDefaultValue;
36     private final OnChangeListener mOnChangeListener;
37 
SecureSettingsObserver(ContentResolver resolver, OnChangeListener listener, String keySetting, int defaultValue)38     public SecureSettingsObserver(ContentResolver resolver, OnChangeListener listener,
39             String keySetting, int defaultValue) {
40         super(new Handler());
41 
42         mResolver = resolver;
43         mOnChangeListener = listener;
44         mKeySetting = keySetting;
45         mDefaultValue = defaultValue;
46     }
47 
48     @Override
onChange(boolean selfChange)49     public void onChange(boolean selfChange) {
50         mOnChangeListener.onSettingsChanged(getValue());
51     }
52 
getValue()53     public boolean getValue() {
54         return Settings.Secure.getInt(mResolver, mKeySetting, mDefaultValue) == 1;
55     }
56 
register()57     public void register() {
58         mResolver.registerContentObserver(Settings.Secure.getUriFor(mKeySetting), false, this);
59     }
60 
getResolver()61     public ContentResolver getResolver() {
62         return mResolver;
63     }
64 
dispatchOnChange()65     public void dispatchOnChange() {
66         onChange(true);
67     }
68 
unregister()69     public void unregister() {
70         mResolver.unregisterContentObserver(this);
71     }
72 
73     public interface OnChangeListener {
onSettingsChanged(boolean isEnabled)74         void onSettingsChanged(boolean isEnabled);
75     }
76 
newNotificationSettingsObserver(Context context, OnChangeListener listener)77     public static SecureSettingsObserver newNotificationSettingsObserver(Context context,
78             OnChangeListener listener) {
79         return new SecureSettingsObserver(
80                 context.getContentResolver(), listener, NOTIFICATION_BADGING, 1);
81     }
82 }
83