1 /*
2  * Copyright (C) 2015 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.settingslib.applications;
18 
19 import android.content.pm.ActivityInfo;
20 import android.content.res.Configuration;
21 import android.content.res.Resources;
22 
23 public class InterestingConfigChanges {
24     private final Configuration mLastConfiguration = new Configuration();
25     private final int mFlags;
26     private int mLastDensity;
27 
InterestingConfigChanges()28     public InterestingConfigChanges() {
29         this(ActivityInfo.CONFIG_LOCALE
30                 | ActivityInfo.CONFIG_UI_MODE | ActivityInfo.CONFIG_SCREEN_LAYOUT
31                 | ActivityInfo.CONFIG_ASSETS_PATHS);
32     }
33 
InterestingConfigChanges(int flags)34     public InterestingConfigChanges(int flags) {
35         mFlags = flags;
36     }
37 
applyNewConfig(Resources res)38     public boolean applyNewConfig(Resources res) {
39         int configChanges = mLastConfiguration.updateFrom(
40                 Configuration.generateDelta(mLastConfiguration, res.getConfiguration()));
41         boolean densityChanged = mLastDensity != res.getDisplayMetrics().densityDpi;
42         if (densityChanged || (configChanges & (mFlags)) != 0) {
43             mLastDensity = res.getDisplayMetrics().densityDpi;
44             return true;
45         }
46         return false;
47     }
48 }
49