Handle config/display changes for WindowContext (02c0e4d2) · Commits · e / os / android_frameworks_base

core/java/android/app/ContextImpl.java

+19 −1

Original line number	Diff line number	Diff line
		@@ -2409,17 +2409,35 @@ class ContextImpl extends Context {
		+ "other visual contexts, such as Activity or one created with "
		+ "Context#createDisplayContext(Display)");
		}
		return new WindowContext(this, null /* token */, type, options);
		return new WindowContext(this, type, options);
		}

		ContextImpl createBaseWindowContext(IBinder token) {
		ContextImpl context = new ContextImpl(this, mMainThread, mPackageInfo, mFeatureId,
		mSplitName, token, mUser, mFlags, mClassLoader, null);
		context.mIsUiContext = true;

		context.mIsAssociatedWithDisplay = true;
		return context;
		}

		Resources createWindowContextResources() {
		final String resDir = mPackageInfo.getResDir();
		final String[] splitResDirs = mPackageInfo.getSplitResDirs();
		final String[] overlayDirs = mPackageInfo.getOverlayDirs();
		final String[] libDirs = mPackageInfo.getApplicationInfo().sharedLibraryFiles;
		final int displayId = getDisplayId();
		final CompatibilityInfo compatInfo = (displayId == Display.DEFAULT_DISPLAY)
		? mPackageInfo.getCompatibilityInfo()
		: CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
		final List<ResourcesLoader> loaders = mResources.getLoaders();

		// TODO(b/128338354): Rename to createTokenResources
		return mResourcesManager.createBaseActivityResources(mToken, resDir, splitResDirs,
		overlayDirs, libDirs, displayId, null /* overrideConfig */,
		compatInfo, mClassLoader, loaders);
		}

		@Override
		public @NonNull Context createFeatureContext(@Nullable String featureId) {
		return new ContextImpl(this, mMainThread, mPackageInfo, featureId, mSplitName,

core/java/android/app/IWindowToken.aidl

0 → 100644

+33 −0

Original line number	Diff line number	Diff line
		/*
		** Copyright 2020, The Android Open Source Project
		**
		** Licensed under the Apache License, Version 2.0 (the "License");
		** you may not use this file except in compliance with the License.
		** You may obtain a copy of the License at
		**
		** http://www.apache.org/licenses/LICENSE-2.0
		**
		** Unless required by applicable law or agreed to in writing, software
		** distributed under the License is distributed on an "AS IS" BASIS,
		** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		** See the License for the specific language governing permissions and
		** limitations under the License.
		*/
		package android.app;

		import android.content.res.Configuration;
		import android.view.IWindow;

		/**
		* Callback to receive configuration changes from {@link com.android.server.WindowToken}.
		* WindowToken can be regarded to as a group of {@link android.view.IWindow} added from the same
		* visual context, such as {@link Activity} or one created with
		* {@link android.content.Context#createWindowContext(int)}. When WindowToken receives configuration
		* changes and/or when it is moved between displays, it will propagate the changes to client side
		* via this interface.
		* @see android.content.Context#createWindowContext(int)
		* {@hide}
		*/
		oneway interface IWindowToken {
		void onConfigurationChanged(in Configuration newConfig, int newDisplayId);
		}

core/java/android/app/WindowContext.java

+24 −33

Original line number	Diff line number	Diff line
		@@ -15,10 +15,12 @@
		*/
		package android.app;

		import static android.view.WindowManagerGlobal.ADD_OKAY;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.content.Context;
		import android.content.ContextWrapper;
		import android.os.Binder;
		import android.os.Bundle;
		import android.os.IBinder;
		import android.os.RemoteException;
		@@ -26,73 +28,62 @@ import android.view.IWindowManager;
		import android.view.WindowManagerGlobal;
		import android.view.WindowManagerImpl;

		import java.lang.ref.Reference;

		/**
		* {@link WindowContext} is a context for non-activity windows such as
		* {@link android.view.WindowManager.LayoutParams#TYPE_APPLICATION_OVERLAY} windows or system
		* windows. Its resources and configuration are adjusted to the area of the display that will be
		* used when a new window is added via {@link android.view.WindowManager.addView}.
		* used when a new window is added via {@link android.view.WindowManager#addView}.
		*
		* @see Context#createWindowContext(int, Bundle)
		* @hide
		*/
		// TODO(b/128338354): Handle config/display changes from server side.
		public class WindowContext extends ContextWrapper {
		private final WindowManagerImpl mWindowManager;
		private final IWindowManager mWms;
		private final IBinder mToken;
		private final int mDisplayId;
		private final WindowTokenClient mToken;
		private boolean mOwnsToken;

		/**
		* Default constructor. Can either accept an existing token or generate one and registers it
		* with the server if necessary.
		* Default constructor. Will generate a {@link WindowTokenClient} and attach this context to
		* the token.
		*
		* @param base Base {@link Context} for this new instance.
		* @param token A valid {@link com.android.server.wm.WindowToken}. Pass {@code null} to generate
		* one.
		* @param type Window type to be used with this context.
		* @hide
		*/
		public WindowContext(Context base, IBinder token, int type, Bundle options) {
		public WindowContext(@NonNull Context base, int type, @Nullable Bundle options) {
		// Correct base context will be built once the token is resolved, so passing 'null' here.
		super(null /* base */);

		mWms = WindowManagerGlobal.getWindowManagerService();
		if (token != null && !isWindowToken(token)) {
		throw new IllegalArgumentException("Token must be registered to server.");
		}
		mToken = token != null ? token : new Binder();
		mToken = new WindowTokenClient();


		final ContextImpl contextImpl = createBaseWindowContext(base, mToken);
		attachBaseContext(contextImpl);
		contextImpl.setOuterContext(this);

		mDisplayId = getDisplayId();
		mToken.attachContext(this);

		mWindowManager = new WindowManagerImpl(this);
		mWindowManager.setDefaultToken(mToken);

		// TODO(b/128338354): Obtain the correct config from WM and adjust resources.
		if (token != null) {
		mOwnsToken = false;
		return;
		}
		int result;
		try {
		mWms.addWindowTokenWithOptions(mToken, type, mDisplayId, options, getPackageName());
		// Register the token with WindowManager. This will also call back with the current
		// config back to the client.
		result = mWms.addWindowTokenWithOptions(
		mToken, type, getDisplayId(), options, getPackageName());

		// TODO(window-context): remove token with a DeathObserver
		} catch (RemoteException e) {
		mOwnsToken = false;
		throw e.rethrowFromSystemServer();
		}
		mOwnsToken = true;
		}

		/** Check if the passed window token is registered with the server. */
		private boolean isWindowToken(@NonNull IBinder token) {
		try {
		return mWms.isWindowToken(token);
		} catch (RemoteException e) {
		e.rethrowFromSystemServer();
		}
		return false;
		mOwnsToken = result == ADD_OKAY;
		Reference.reachabilityFence(this);
		}

		private static ContextImpl createBaseWindowContext(Context outer, IBinder token) {
		@@ -112,7 +103,7 @@ public class WindowContext extends ContextWrapper {
		protected void finalize() throws Throwable {
		if (mOwnsToken) {
		try {
		mWms.removeWindowToken(mToken, mDisplayId);
		mWms.removeWindowToken(mToken, getDisplayId());
		mOwnsToken = false;
		} catch (RemoteException e) {
		throw e.rethrowFromSystemServer();

core/java/android/app/WindowTokenClient.java

0 → 100644

+76 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/
		package android.app;

		import android.annotation.NonNull;
		import android.content.Context;
		import android.content.res.Configuration;
		import android.os.Bundle;
		import android.os.IBinder;

		/**
		* Client implementation of {@link IWindowToken}. It can receive configuration change callbacks from
		* server when window token config is updated or when it is moved between displays, and update the
		* resources associated with this token on the client side. This will make sure that
		* {@link WindowContext} instances will have updated resources and configuration.
		* @hide
		*/
		public class WindowTokenClient extends IWindowToken.Stub {
		/**
		* Attached {@link Context} for this window token to update configuration and resources.
		* Initialized by {@link #attachContext(Context)}.
		*/
		private Context mContext = null;

		private final ResourcesManager mResourcesManager = ResourcesManager.getInstance();

		/**
		* Attaches {@code context} to this {@link WindowTokenClient}. Each {@link WindowTokenClient}
		* can only attach one {@link Context}.
		* <p>This method must be called before invoking
		* {@link android.view.IWindowManager#addWindowTokenWithOptions(IBinder, int, int, Bundle,
		* String)}.<p/>
		*
		* @param context context to be attached
		* @throws IllegalStateException if attached context has already existed.
		*/
		void attachContext(@NonNull Context context) {
		if (mContext != null) {
		throw new IllegalStateException("Context is already attached.");
		}
		mContext = context;
		ContextImpl impl = ContextImpl.getImpl(mContext);
		impl.setResources(impl.createWindowContextResources());
		}

		@Override
		public void onConfigurationChanged(Configuration newConfig, int newDisplayId) {
		final int currentDisplayId = mContext.getDisplayId();
		final boolean displayChanged = newDisplayId != currentDisplayId;
		final Configuration config = new Configuration(mContext.getResources()
		.getConfiguration());
		final boolean configChanged = config.isOtherSeqNewer(newConfig)
		&& config.updateFrom(newConfig) != 0;
		if (displayChanged \|\| configChanged) {
		// TODO(ag/9789103): update resource manager logic to track non-activity tokens
		mResourcesManager.updateResourcesForActivity(asBinder(), config, newDisplayId,
		displayChanged);
		}
		if (displayChanged) {
		mContext.updateDisplay(newDisplayId);
		}
		}
		}

core/java/android/view/WindowManager.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -458,7 +458,7 @@ public interface WindowManager extends ViewManager {
		}

		/**
		* Returns the largets {@link WindowMetrics} an app may expect in the current system state.
		* Returns the largest {@link WindowMetrics} an app may expect in the current system state.
		* <p>
		* The metrics describe the size of the largest potential area the window might occupy with
		* {@link LayoutParams#MATCH_PARENT MATCH_PARENT} width and height, and the {@link WindowInsets}