1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/**
* Copyright (C) 2016 The DirtyUnicorns Project
*
* @author: Randall Rushing <randall.rushing@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* A simple, semi-pojo ContentObserver subclass to eliminate too many observers
* in too many places. A class implementing SmartObservable simply provides
* the desired uris as a set to observe and handles onChange(Uri uri) as normal
*
*/
package com.android.systemui.navigation.utils;
import java.util.HashSet;
import java.util.Set;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Handler;
import android.os.UserHandle;
import android.text.TextUtils;
public class SmartObserver extends ContentObserver {
public interface SmartObservable {
public Set<Uri> onGetUris();
public void onChange(Uri uri);
}
private ContentResolver mResolver;
private Set<SmartObservable> mListeners = new HashSet<SmartObservable>();
public SmartObserver(Handler handler, ContentResolver resolver) {
super(handler);
mResolver = resolver;
}
public void addListener(SmartObservable listener) {
if (listener != null) {
mListeners.add(listener);
for (Uri uri : listener.onGetUris()) {
mResolver.registerContentObserver(uri, false, this, UserHandle.USER_ALL);
}
}
}
/**
* Just in case the ContentObserver is unregistered
* but we want to keep callbacks registered
*/
public void registerListeners() {
for (SmartObservable listener : mListeners) {
for (Uri uriz : listener.onGetUris()) {
mResolver.registerContentObserver(uriz, false, this, UserHandle.USER_ALL);
}
}
}
public void cleanUp() {
mListeners.clear();
mResolver.unregisterContentObserver(this);
}
@Override
public void onChange(boolean selfChange, Uri uri) {
for (SmartObservable listener : mListeners) {
for (Uri uriz : listener.onGetUris()) {
if (TextUtils.equals(uriz.toString(), uri.toString())) {
listener.onChange(uri);
}
}
}
}
}
|
