1 /* 2 * Copyright (C) 2020 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 package android.window; 17 18 import android.annotation.NonNull; 19 import android.app.ActivityThread; 20 import android.app.IWindowToken; 21 import android.app.ResourcesManager; 22 import android.content.Context; 23 import android.content.res.Configuration; 24 import android.os.Bundle; 25 import android.os.IBinder; 26 27 import java.lang.ref.WeakReference; 28 29 /** 30 * This class is used to receive {@link Configuration} changes from the associated window manager 31 * node on the server side, and apply the change to the {@link Context#getResources() associated 32 * Resources} of the attached {@link Context}. It is also used as 33 * {@link Context#getWindowContextToken() the token of non-Activity UI Contexts}. 34 * 35 * @see WindowContext 36 * @see android.view.IWindowManager#registerWindowContextListener(IBinder, int, int, Bundle) 37 * 38 * @hide 39 */ 40 public class WindowTokenClient extends IWindowToken.Stub { 41 /** 42 * Attached {@link Context} for this window token to update configuration and resources. 43 * Initialized by {@link #attachContext(Context)}. 44 */ 45 private WeakReference<Context> mContextRef = null; 46 47 private final ResourcesManager mResourcesManager = ResourcesManager.getInstance(); 48 49 /** 50 * Attaches {@code context} to this {@link WindowTokenClient}. Each {@link WindowTokenClient} 51 * can only attach one {@link Context}. 52 * <p>This method must be called before invoking 53 * {@link android.view.IWindowManager#registerWindowContextListener(IBinder, int, int, 54 * Bundle, boolean)}.<p/> 55 * 56 * @param context context to be attached 57 * @throws IllegalStateException if attached context has already existed. 58 */ attachContext(@onNull Context context)59 public void attachContext(@NonNull Context context) { 60 if (mContextRef != null) { 61 throw new IllegalStateException("Context is already attached."); 62 } 63 mContextRef = new WeakReference<>(context); 64 } 65 66 @Override onConfigurationChanged(Configuration newConfig, int newDisplayId)67 public void onConfigurationChanged(Configuration newConfig, int newDisplayId) { 68 final Context context = mContextRef.get(); 69 if (context == null) { 70 return; 71 } 72 final int currentDisplayId = context.getDisplayId(); 73 final boolean displayChanged = newDisplayId != currentDisplayId; 74 final Configuration config = context.getResources().getConfiguration(); 75 final boolean configChanged = config.diff(newConfig) != 0; 76 if (displayChanged || configChanged) { 77 // TODO(ag/9789103): update resource manager logic to track non-activity tokens 78 mResourcesManager.updateResourcesForActivity(this, newConfig, newDisplayId); 79 if (context instanceof WindowContext) { 80 ActivityThread.currentActivityThread().getHandler().post( 81 () -> ((WindowContext) context).dispatchConfigurationChanged(newConfig)); 82 } 83 } 84 if (displayChanged) { 85 context.updateDisplay(newDisplayId); 86 } 87 } 88 89 @Override onWindowTokenRemoved()90 public void onWindowTokenRemoved() { 91 final Context context = mContextRef.get(); 92 if (context != null) { 93 context.destroy(); 94 mContextRef.clear(); 95 } 96 } 97 } 98