Implement ActivityView.

With an existing ActivityContainer a caller can now create an
ActivityView which consists of a new VirtualDisplay immediately
attached to the ActivityContainer.

Change-Id: Id70333dcbef55d524a87df8f8c92d72ca5579364

2 files changed, 166 insertions, 0 deletions

diff --git a/core/java/android/app/ActivityView.java b/core/java/android/app/ActivityView.java
new file mode 100644
index 0000000..fef4597
--- /dev/null
+++ b/core/java/android/app/ActivityView.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2013 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.Context;
+import android.content.ContextWrapper;
+import android.content.Intent;
+import android.graphics.SurfaceTexture;
+import android.os.IBinder;
+import android.os.RemoteException;
+import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.view.Surface;
+import android.view.TextureView;
+import android.view.TextureView.SurfaceTextureListener;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+
+public class ActivityView extends ViewGroup {
+    private final TextureView mTextureView;
+    private IActivityContainer mActivityContainer;
+    private Activity mActivity;
+    private boolean mAttached;
+    private int mWidth;
+    private int mHeight;
+
+    public ActivityView(Context context) {
+        this(context, null);
+    }
+
+    public ActivityView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ActivityView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        while (context instanceof ContextWrapper) {
+            if (context instanceof Activity) {
+                mActivity = (Activity)context;
+                break;
+            }
+            context = ((ContextWrapper)context).getBaseContext();
+        }
+        if (mActivity == null) {
+            throw new IllegalStateException("The ActivityView's Context is not an Activity.");
+        }
+
+        mTextureView = new TextureView(context);
+        mTextureView.setSurfaceTextureListener(new ActivityViewSurfaceTextureListener());
+        addView(mTextureView);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        mTextureView.layout(l, t, r, b);
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        try {
+            final IBinder token = mActivity.getActivityToken();
+            mActivityContainer =
+                    ActivityManagerNative.getDefault().createActivityContainer(token, null);
+        } catch (RemoteException e) {
+            throw new IllegalStateException("ActivityView: Unable to create ActivityContainer. "
+                    + e);
+        }
+
+        final SurfaceTexture surfaceTexture = mTextureView.getSurfaceTexture();
+        if (surfaceTexture != null) {
+            createActivityView(surfaceTexture);
+        }
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        if (mActivityContainer != null) {
+            try {
+                mActivityContainer.deleteActivityView();
+            } catch (RemoteException e) {
+            }
+            mActivityContainer = null;
+        }
+        mAttached = false;
+    }
+
+    public void startActivity(Intent intent) {
+        if (mActivityContainer != null && mAttached) {
+            try {
+                mActivityContainer.startActivity(intent);
+            } catch (RemoteException e) {
+                throw new IllegalStateException("ActivityView: Unable to startActivity. " + e);
+            }
+        }
+    }
+
+    /** Call when both mActivityContainer and mTextureView's SurfaceTexture are not null */
+    private void createActivityView(SurfaceTexture surfaceTexture) {
+        WindowManager wm = (WindowManager)mActivity.getSystemService(Context.WINDOW_SERVICE);
+        DisplayMetrics metrics = new DisplayMetrics();
+        wm.getDefaultDisplay().getMetrics(metrics);
+
+        try {
+            mActivityContainer.createActivityView(new Surface(surfaceTexture), mWidth, mHeight,
+                    metrics.densityDpi);
+        } catch (RemoteException e) {
+            mActivityContainer = null;
+            throw new IllegalStateException(
+                    "ActivityView: Unable to create ActivityContainer. " + e);
+        }
+        mAttached = true;
+    }
+
+    private class ActivityViewSurfaceTextureListener implements SurfaceTextureListener {
+        @Override
+        public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width,
+                int height) {
+            mWidth = width;
+            mHeight = height;
+            if (mActivityContainer != null) {
+                createActivityView(surfaceTexture);
+            }
+        }
+
+        @Override
+        public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width,
+                int height) {
+        }
+
+        @Override
+        public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
+            try {
+                mActivityContainer.deleteActivityView();
+                // TODO: Add binderDied to handle this nullification.
+                mActivityContainer = null;
+            } catch (RemoteException r) {
+            }
+            mAttached = false;
+            return false;
+        }
+
+        @Override
+        public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {
+
+        }
+
+    }
+}
diff --git a/core/java/android/app/IActivityContainer.aidl b/core/java/android/app/IActivityContainer.aidl
index 2d8d18f..b03a459 100644
--- a/core/java/android/app/IActivityContainer.aidl
+++ b/core/java/android/app/IActivityContainer.aidl
@@ -19,6 +19,7 @@ package android.app;
 import android.app.IActivityContainerCallback;
 import android.content.Intent;
 import android.os.IBinder;
+import android.view.Surface;
 
 /** @hide */
 interface IActivityContainer {
@@ -26,4 +27,6 @@ interface IActivityContainer {
     int getDisplayId();
     void detachFromDisplay();
     int startActivity(in Intent intent);
+    void createActivityView(in Surface surface, int width, int height, int density);
+    void deleteActivityView();
 }