| /** |
| * Copyright (c) 2017 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.Intent; |
| import android.hardware.display.DisplayManager; |
| import android.hardware.display.VirtualDisplay; |
| import android.hardware.input.InputManager; |
| import android.os.RemoteException; |
| import android.util.AttributeSet; |
| import android.util.DisplayMetrics; |
| import android.util.Log; |
| import android.view.InputDevice; |
| import android.view.InputEvent; |
| import android.view.MotionEvent; |
| import android.view.Surface; |
| import android.view.SurfaceHolder; |
| import android.view.SurfaceView; |
| import android.view.ViewGroup; |
| import android.view.WindowManager; |
| |
| import dalvik.system.CloseGuard; |
| |
| /** |
| * Activity container that allows launching activities into itself and does input forwarding. |
| * <p>Creation of this view is only allowed to callers who have |
| * {@link android.Manifest.permission#INJECT_EVENTS} permission. |
| * <p>Activity launching into this container is restricted by the same rules that apply to launching |
| * on VirtualDisplays. |
| * @hide |
| */ |
| public class ActivityView extends ViewGroup { |
| |
| private static final String DISPLAY_NAME = "ActivityViewVirtualDisplay"; |
| private static final String TAG = "ActivityView"; |
| |
| private VirtualDisplay mVirtualDisplay; |
| private final SurfaceView mSurfaceView; |
| private Surface mSurface; |
| |
| private final SurfaceCallback mSurfaceCallback; |
| private StateCallback mActivityViewCallback; |
| |
| private IInputForwarder mInputForwarder; |
| |
| private final CloseGuard mGuard = CloseGuard.get(); |
| private boolean mOpened; // Protected by mGuard. |
| |
| public ActivityView(Context context) { |
| this(context, null /* attrs */); |
| } |
| |
| public ActivityView(Context context, AttributeSet attrs) { |
| this(context, attrs, 0 /* defStyle */); |
| } |
| |
| public ActivityView(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| |
| mSurfaceView = new SurfaceView(context); |
| mSurfaceCallback = new SurfaceCallback(); |
| mSurfaceView.getHolder().addCallback(mSurfaceCallback); |
| addView(mSurfaceView); |
| |
| mOpened = true; |
| mGuard.open("release"); |
| } |
| |
| /** Callback that notifies when the container is ready or destroyed. */ |
| public abstract static class StateCallback { |
| /** |
| * Called when the container is ready for launching activities. Calling |
| * {@link #startActivity(Intent)} prior to this callback will result in an |
| * {@link IllegalStateException}. |
| * |
| * @see #startActivity(Intent) |
| */ |
| public abstract void onActivityViewReady(ActivityView view); |
| /** |
| * Called when the container can no longer launch activities. Calling |
| * {@link #startActivity(Intent)} after this callback will result in an |
| * {@link IllegalStateException}. |
| * |
| * @see #startActivity(Intent) |
| */ |
| public abstract void onActivityViewDestroyed(ActivityView view); |
| } |
| |
| /** |
| * Set the callback to be notified about state changes. |
| * <p>This class must finish initializing before {@link #startActivity(Intent)} can be called. |
| * <p>Note: If the instance was ready prior to this call being made, then |
| * {@link StateCallback#onActivityViewReady(ActivityView)} will be called from within |
| * this method call. |
| * |
| * @param callback The callback to report events to. |
| * |
| * @see StateCallback |
| * @see #startActivity(Intent) |
| */ |
| public void setCallback(StateCallback callback) { |
| mActivityViewCallback = callback; |
| |
| if (mVirtualDisplay != null && mActivityViewCallback != null) { |
| mActivityViewCallback.onActivityViewReady(this); |
| } |
| } |
| |
| /** |
| * Launch a new activity into this container. |
| * <p>Activity resolved by the provided {@link Intent} must have |
| * {@link android.R.attr#resizeableActivity} attribute set to {@code true} in order to be |
| * launched here. Also, if activity is not owned by the owner of this container, it must allow |
| * embedding and the caller must have permission to embed. |
| * <p>Note: This class must finish initializing and |
| * {@link StateCallback#onActivityViewReady(ActivityView)} callback must be triggered before |
| * this method can be called. |
| * |
| * @param intent Intent used to launch an activity. |
| * |
| * @see StateCallback |
| * @see #startActivity(PendingIntent) |
| */ |
| public void startActivity(@NonNull Intent intent) { |
| final ActivityOptions options = prepareActivityOptions(); |
| getContext().startActivity(intent, options.toBundle()); |
| } |
| |
| /** |
| * Launch a new activity into this container. |
| * <p>Activity resolved by the provided {@link PendingIntent} must have |
| * {@link android.R.attr#resizeableActivity} attribute set to {@code true} in order to be |
| * launched here. Also, if activity is not owned by the owner of this container, it must allow |
| * embedding and the caller must have permission to embed. |
| * <p>Note: This class must finish initializing and |
| * {@link StateCallback#onActivityViewReady(ActivityView)} callback must be triggered before |
| * this method can be called. |
| * |
| * @param pendingIntent Intent used to launch an activity. |
| * |
| * @see StateCallback |
| * @see #startActivity(Intent) |
| */ |
| public void startActivity(@NonNull PendingIntent pendingIntent) { |
| final ActivityOptions options = prepareActivityOptions(); |
| try { |
| pendingIntent.send(null /* context */, 0 /* code */, null /* intent */, |
| null /* onFinished */, null /* handler */, null /* requiredPermission */, |
| options.toBundle()); |
| } catch (PendingIntent.CanceledException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** |
| * Check if container is ready to launch and create {@link ActivityOptions} to target the |
| * virtual display. |
| */ |
| private ActivityOptions prepareActivityOptions() { |
| if (mVirtualDisplay == null) { |
| throw new IllegalStateException( |
| "Trying to start activity before ActivityView is ready."); |
| } |
| final ActivityOptions options = ActivityOptions.makeBasic(); |
| options.setLaunchDisplayId(mVirtualDisplay.getDisplay().getDisplayId()); |
| return options; |
| } |
| |
| /** |
| * Release this container. Activity launching will no longer be permitted. |
| * <p>Note: Calling this method is allowed after |
| * {@link StateCallback#onActivityViewReady(ActivityView)} callback was triggered and before |
| * {@link StateCallback#onActivityViewDestroyed(ActivityView)}. |
| * |
| * @see StateCallback |
| */ |
| public void release() { |
| if (mVirtualDisplay == null) { |
| throw new IllegalStateException( |
| "Trying to release container that is not initialized."); |
| } |
| performRelease(); |
| } |
| |
| @Override |
| public void onLayout(boolean changed, int l, int t, int r, int b) { |
| mSurfaceView.layout(0 /* left */, 0 /* top */, r - l /* right */, b - t /* bottom */); |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent event) { |
| return injectInputEvent(event) || super.onTouchEvent(event); |
| } |
| |
| @Override |
| public boolean onGenericMotionEvent(MotionEvent event) { |
| if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { |
| if (injectInputEvent(event)) { |
| return true; |
| } |
| } |
| return super.onGenericMotionEvent(event); |
| } |
| |
| private boolean injectInputEvent(InputEvent event) { |
| if (mInputForwarder != null) { |
| try { |
| return mInputForwarder.forwardEvent(event); |
| } catch (RemoteException e) { |
| e.rethrowAsRuntimeException(); |
| } |
| } |
| return false; |
| } |
| |
| private class SurfaceCallback implements SurfaceHolder.Callback { |
| @Override |
| public void surfaceCreated(SurfaceHolder surfaceHolder) { |
| mSurface = mSurfaceView.getHolder().getSurface(); |
| if (mVirtualDisplay == null) { |
| initVirtualDisplay(); |
| if (mVirtualDisplay != null && mActivityViewCallback != null) { |
| mActivityViewCallback.onActivityViewReady(ActivityView.this); |
| } |
| } else { |
| mVirtualDisplay.setSurface(surfaceHolder.getSurface()); |
| } |
| } |
| |
| @Override |
| public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) { |
| if (mVirtualDisplay != null) { |
| mVirtualDisplay.resize(width, height, getBaseDisplayDensity()); |
| } |
| } |
| |
| @Override |
| public void surfaceDestroyed(SurfaceHolder surfaceHolder) { |
| mSurface.release(); |
| mSurface = null; |
| if (mVirtualDisplay != null) { |
| mVirtualDisplay.setSurface(null); |
| } |
| } |
| } |
| |
| private void initVirtualDisplay() { |
| if (mVirtualDisplay != null) { |
| throw new IllegalStateException("Trying to initialize for the second time."); |
| } |
| |
| final int width = mSurfaceView.getWidth(); |
| final int height = mSurfaceView.getHeight(); |
| final DisplayManager displayManager = mContext.getSystemService(DisplayManager.class); |
| mVirtualDisplay = displayManager.createVirtualDisplay( |
| DISPLAY_NAME + "@" + System.identityHashCode(this), |
| width, height, getBaseDisplayDensity(), mSurface, 0 /* flags */); |
| if (mVirtualDisplay == null) { |
| Log.e(TAG, "Failed to initialize ActivityView"); |
| return; |
| } |
| |
| mInputForwarder = InputManager.getInstance().createInputForwarder( |
| mVirtualDisplay.getDisplay().getDisplayId()); |
| } |
| |
| private void performRelease() { |
| if (!mOpened) { |
| return; |
| } |
| |
| mSurfaceView.getHolder().removeCallback(mSurfaceCallback); |
| |
| if (mInputForwarder != null) { |
| mInputForwarder = null; |
| } |
| |
| final boolean displayReleased; |
| if (mVirtualDisplay != null) { |
| mVirtualDisplay.release(); |
| mVirtualDisplay = null; |
| displayReleased = true; |
| } else { |
| displayReleased = false; |
| } |
| |
| if (mSurface != null) { |
| mSurface.release(); |
| mSurface = null; |
| } |
| |
| if (displayReleased && mActivityViewCallback != null) { |
| mActivityViewCallback.onActivityViewDestroyed(this); |
| } |
| |
| mGuard.close(); |
| mOpened = false; |
| } |
| |
| /** Get density of the hosting display. */ |
| private int getBaseDisplayDensity() { |
| final WindowManager wm = mContext.getSystemService(WindowManager.class); |
| final DisplayMetrics metrics = new DisplayMetrics(); |
| wm.getDefaultDisplay().getMetrics(metrics); |
| return metrics.densityDpi; |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| if (mGuard != null) { |
| mGuard.warnIfOpen(); |
| performRelease(); |
| } |
| } finally { |
| super.finalize(); |
| } |
| } |
| } |