1 package com.android.launcher3.util;
2 
3 /**
4  * Copyright (C) 2015 The Android Open Source Project
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *      http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 import android.content.BroadcastReceiver;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.content.IntentFilter;
23 import android.content.res.Configuration;
24 import android.util.Log;
25 
26 /**
27  * {@link BroadcastReceiver} which watches configuration changes and
28  * restarts the process in case changes which affect the device profile occur.
29  */
30 public class ConfigMonitor extends BroadcastReceiver {
31 
32     private final Context mContext;
33     private final float mFontScale;
34     private final int mDensity;
35 
ConfigMonitor(Context context)36     public ConfigMonitor(Context context) {
37         mContext = context;
38 
39         Configuration config = context.getResources().getConfiguration();
40         mFontScale = config.fontScale;
41         mDensity = config.densityDpi;
42     }
43 
44     @Override
onReceive(Context context, Intent intent)45     public void onReceive(Context context, Intent intent) {
46         Configuration config = context.getResources().getConfiguration();
47         if (mFontScale != config.fontScale || mDensity != config.densityDpi) {
48             Log.d("ConfigMonitor", "Configuration changed, restarting launcher");
49             mContext.unregisterReceiver(this);
50             android.os.Process.killProcess(android.os.Process.myPid());
51         }
52     }
53 
register()54     public void register() {
55         mContext.registerReceiver(this, new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
56     }
57 }
58