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.annotation.SuppressLint; 20 import android.content.pm.ActivityInfo; 21 import android.content.res.Configuration; 22 import android.content.res.Resources; 23 24 /** 25 * A class for applying config changes and determing if doing so resulting in any "interesting" 26 * changes. 27 */ 28 public class InterestingConfigChanges { 29 private final Configuration mLastConfiguration = new Configuration(); 30 private final int mFlags; 31 private int mLastDensity; 32 InterestingConfigChanges()33 public InterestingConfigChanges() { 34 this(ActivityInfo.CONFIG_LOCALE | ActivityInfo.CONFIG_LAYOUT_DIRECTION 35 | ActivityInfo.CONFIG_UI_MODE | ActivityInfo.CONFIG_ASSETS_PATHS); 36 } 37 InterestingConfigChanges(int flags)38 public InterestingConfigChanges(int flags) { 39 mFlags = flags; 40 } 41 42 /** 43 * Applies the given config change and returns whether an "interesting" change happened. 44 * 45 * @param res The source of the new config to apply 46 * 47 * @return Whether interesting changes occurred 48 */ 49 @SuppressLint("NewApi") applyNewConfig(Resources res)50 public boolean applyNewConfig(Resources res) { 51 int configChanges = mLastConfiguration.updateFrom( 52 Configuration.generateDelta(mLastConfiguration, res.getConfiguration())); 53 boolean densityChanged = mLastDensity != res.getDisplayMetrics().densityDpi; 54 if (densityChanged || (configChanges & (mFlags)) != 0) { 55 mLastDensity = res.getDisplayMetrics().densityDpi; 56 return true; 57 } 58 return false; 59 } 60 } 61