1 /*
2  * Copyright (C) 2019 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.uioverrides;
18 
19 import android.annotation.TargetApi;
20 import android.content.Context;
21 import android.os.Build;
22 import android.provider.DeviceConfig;
23 
24 import com.android.launcher3.config.FeatureFlags.DebugFlag;
25 
26 import java.util.ArrayList;
27 
28 @TargetApi(Build.VERSION_CODES.P)
29 public class DeviceFlag extends DebugFlag {
30 
31     public static final String NAMESPACE_LAUNCHER = "launcher";
32 
33     private final boolean mDefaultValueInCode;
34     ArrayList<Runnable> mListeners;
35 
DeviceFlag(String key, boolean defaultValue, String description)36     public DeviceFlag(String key, boolean defaultValue, String description) {
37         super(key, getDeviceValue(key, defaultValue), description);
38         mDefaultValueInCode = defaultValue;
39     }
40 
41     @Override
appendProps(StringBuilder src)42     protected StringBuilder appendProps(StringBuilder src) {
43         return super.appendProps(src).append(", mDefaultValueInCode=").append(mDefaultValueInCode);
44     }
45 
46     @Override
initialize(Context context)47     public void initialize(Context context) {
48         super.initialize(context);
49         if (mListeners == null) {
50             mListeners = new ArrayList<>();
51             registerDeviceConfigChangedListener(context);
52         }
53     }
54 
55     @Override
addChangeListener(Context context, Runnable r)56     public void addChangeListener(Context context, Runnable r) {
57         if (mListeners == null) {
58             initialize(context);
59         }
60         mListeners.add(r);
61     }
62 
registerDeviceConfigChangedListener(Context context)63     private void registerDeviceConfigChangedListener(Context context) {
64         DeviceConfig.addOnPropertiesChangedListener(
65                 NAMESPACE_LAUNCHER,
66                 context.getMainExecutor(),
67                 properties -> {
68                     if (!NAMESPACE_LAUNCHER.equals(properties.getNamespace())
69                             || !properties.getKeyset().contains(key)) {
70                         return;
71                     }
72                     defaultValue = getDeviceValue(key, mDefaultValueInCode);
73                     initialize(context);
74                     for (Runnable r: mListeners) {
75                         r.run();
76                     }
77                 });
78     }
79 
getDeviceValue(String key, boolean defaultValue)80     protected static boolean getDeviceValue(String key, boolean defaultValue) {
81         return DeviceConfig.getBoolean(NAMESPACE_LAUNCHER, key, defaultValue);
82     }
83 }
84