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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.settings.applications.assist;
18 
19 import android.content.ContentResolver;
20 import android.database.ContentObserver;
21 import android.net.Uri;
22 import android.os.Handler;
23 import android.provider.Settings;
24 
25 import java.util.List;
26 
27 public abstract class AssistSettingObserver extends ContentObserver {
28 
29     private final Uri ASSIST_URI =
30             Settings.Secure.getUriFor(Settings.Secure.ASSISTANT);
31 
AssistSettingObserver()32     public AssistSettingObserver() {
33         super(null /* handler */);
34     }
35 
register(ContentResolver cr, boolean register)36     public void register(ContentResolver cr, boolean register) {
37         if (register) {
38             cr.registerContentObserver(ASSIST_URI, false, this);
39             final List<Uri> settingUri = getSettingUris();
40             if (settingUri != null) {
41                 for (Uri uri : settingUri)
42                 cr.registerContentObserver(uri, false, this);
43             }
44         } else {
45             cr.unregisterContentObserver(this);
46         }
47     }
48 
49     @Override
onChange(boolean selfChange, Uri uri)50     public void onChange(boolean selfChange, Uri uri) {
51         super.onChange(selfChange, uri);
52         boolean shouldUpdatePreference = false;
53         final List<Uri> settingUri = getSettingUris();
54         if (ASSIST_URI.equals(uri) || (settingUri != null && settingUri.contains(uri))) {
55             shouldUpdatePreference = true;
56         }
57         if (shouldUpdatePreference) {
58             onSettingChange();
59         }
60     }
61 
getSettingUris()62     protected abstract List<Uri> getSettingUris();
63 
onSettingChange()64     public abstract void onSettingChange();
65 }
66