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 import com.android.launcher3.Utilities;
27 
28 /**
29  * {@link BroadcastReceiver} which watches configuration changes and
30  * restarts the process in case changes which affect the device profile occur.
31  */
32 public class ConfigMonitor extends BroadcastReceiver {
33 
34     private final Context mContext;
35     private final float mFontScale;
36     private final int mDensity;
37 
ConfigMonitor(Context context)38     public ConfigMonitor(Context context) {
39         mContext = context;
40 
41         Configuration config = context.getResources().getConfiguration();
42         mFontScale = config.fontScale;
43         mDensity = getDensity(config);
44     }
45 
46     @Override
onReceive(Context context, Intent intent)47     public void onReceive(Context context, Intent intent) {
48         Configuration config = context.getResources().getConfiguration();
49         if (mFontScale != config.fontScale || mDensity != getDensity(config)) {
50             Log.d("ConfigMonitor", "Configuration changed, restarting launcher");
51             mContext.unregisterReceiver(this);
52             android.os.Process.killProcess(android.os.Process.myPid());
53         }
54     }
55 
register()56     public void register() {
57         mContext.registerReceiver(this, new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
58     }
59 
getDensity(Configuration config)60     private static int getDensity(Configuration config) {
61         return Utilities.ATLEAST_JB_MR1 ? config.densityDpi : 0;
62     }
63 }
64