ConfigMonitor.java revision a52ecb0390c85afb385371bb844bb496c59ddf87 
1package 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
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.content.res.Configuration;
24import 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 */
30public class ConfigMonitor extends BroadcastReceiver {
31
32    private final Context mContext;
33    private final float mFontScale;
34    private final int mDensity;
35
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
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
54    public void register() {
55        mContext.registerReceiver(this, new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));
56    }
57}
58