5 files changed, 41 insertions, 8 deletions
diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 8f2f9ca..e02410a 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -747,6 +747,7 @@ public class Activity extends ContextThemeWrapper
     int mResultCode = RESULT_CANCELED;
     Intent mResultData = null;
     private TranslucentConversionListener mTranslucentCallback;
+    private boolean mChangeCanvasToTranslucent;
 
     private boolean mTitleReady = false;
 
@@ -4903,7 +4904,9 @@ public class Activity extends ContextThemeWrapper
     public void convertFromTranslucent() {
         try {
             mTranslucentCallback = null;
-            ActivityManagerNative.getDefault().convertFromTranslucent(mToken);
+            if (ActivityManagerNative.getDefault().convertFromTranslucent(mToken)) {
+                WindowManagerGlobal.getInstance().changeCanvasOpacity(mToken, true);
+            }
         } catch (RemoteException e) {
             // pass
         }
@@ -4931,7 +4934,8 @@ public class Activity extends ContextThemeWrapper
     public void convertToTranslucent(TranslucentConversionListener callback) {
         try {
             mTranslucentCallback = callback;
-            ActivityManagerNative.getDefault().convertToTranslucent(mToken);
+            mChangeCanvasToTranslucent =
+                    ActivityManagerNative.getDefault().convertToTranslucent(mToken);
         } catch (RemoteException e) {
             // pass
         }
@@ -4943,6 +4947,9 @@ public class Activity extends ContextThemeWrapper
             mTranslucentCallback.onTranslucentConversionComplete(drawComplete);
             mTranslucentCallback = null;
         }
+        if (mChangeCanvasToTranslucent) {
+            WindowManagerGlobal.getInstance().changeCanvasOpacity(mToken, false);
+        }
     }
 
     /**
diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index 6a29552..6d72114 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -1502,16 +1502,18 @@ public abstract class ActivityManagerNative extends Binder implements IActivityM
         case CONVERT_FROM_TRANSLUCENT_TRANSACTION: {
             data.enforceInterface(IActivityManager.descriptor);
             IBinder token = data.readStrongBinder();
-            convertFromTranslucent(token);
+            boolean converted = convertFromTranslucent(token);
             reply.writeNoException();
+            reply.writeInt(converted ? 1 : 0);
             return true;
         }
 
         case CONVERT_TO_TRANSLUCENT_TRANSACTION: {
             data.enforceInterface(IActivityManager.descriptor);
             IBinder token = data.readStrongBinder();
-            convertToTranslucent(token);
+            boolean converted = convertToTranslucent(token);
             reply.writeNoException();
+            reply.writeInt(converted ? 1 : 0);
             return true;
         }
 
@@ -3876,7 +3878,7 @@ class ActivityManagerProxy implements IActivityManager
         reply.recycle();
     }
 
-    public void convertFromTranslucent(IBinder token)
+    public boolean convertFromTranslucent(IBinder token)
             throws RemoteException {
         Parcel data = Parcel.obtain();
         Parcel reply = Parcel.obtain();
@@ -3884,11 +3886,13 @@ class ActivityManagerProxy implements IActivityManager
         data.writeStrongBinder(token);
         mRemote.transact(CONVERT_FROM_TRANSLUCENT_TRANSACTION, data, reply, 0);
         reply.readException();
+        boolean res = reply.readInt() != 0;
         data.recycle();
         reply.recycle();
+        return res;
     }
 
-    public void convertToTranslucent(IBinder token)
+    public boolean convertToTranslucent(IBinder token)
             throws RemoteException {
         Parcel data = Parcel.obtain();
         Parcel reply = Parcel.obtain();
@@ -3896,8 +3900,10 @@ class ActivityManagerProxy implements IActivityManager
         data.writeStrongBinder(token);
         mRemote.transact(CONVERT_TO_TRANSLUCENT_TRANSACTION, data, reply, 0);
         reply.readException();
+        boolean res = reply.readInt() != 0;
         data.recycle();
         reply.recycle();
+        return res;
     }
 
     public void setImmersive(IBinder token, boolean immersive)
diff --git a/core/java/android/app/IActivityManager.java b/core/java/android/app/IActivityManager.java
index 6d1b6fc..af9a245 100644
--- a/core/java/android/app/IActivityManager.java
+++ b/core/java/android/app/IActivityManager.java
@@ -301,8 +301,8 @@ public interface IActivityManager extends IInterface {
 
     public void finishHeavyWeightApp() throws RemoteException;
 
-    public void convertFromTranslucent(IBinder token) throws RemoteException;
-    public void convertToTranslucent(IBinder token) throws RemoteException;
+    public boolean convertFromTranslucent(IBinder token) throws RemoteException;
+    public boolean convertToTranslucent(IBinder token) throws RemoteException;
     public void notifyActivityDrawn(IBinder token) throws RemoteException;
 
     public void setImmersive(IBinder token, boolean immersive) throws RemoteException;
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index f711e7a..354e815 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -5960,6 +5960,11 @@ public final class ViewRootImpl implements ViewParent,
         // Do nothing.
     }
 
+    void changeCanvasOpacity(boolean opaque) {
+        // TODO(romainguy): recreate Canvas (software or hardware) to reflect the opacity change.
+        Log.d(TAG, "changeCanvasOpacity: opaque=" + opaque);
+    }
+
     class TakenSurfaceHolder extends BaseSurfaceHolder {
         @Override
         public boolean onAllowLockCanvas() {
diff --git a/core/java/android/view/WindowManagerGlobal.java b/core/java/android/view/WindowManagerGlobal.java
index 3dd96f5..96c0ed2 100644
--- a/core/java/android/view/WindowManagerGlobal.java
+++ b/core/java/android/view/WindowManagerGlobal.java
@@ -494,6 +494,21 @@ public final class WindowManagerGlobal {
             }
         }
     }
+
+    /** @hide */
+    public void changeCanvasOpacity(IBinder token, boolean opaque) {
+        if (token == null) {
+            return;
+        }
+        synchronized (mLock) {
+            for (int i = mParams.size() - 1; i >= 0; --i) {
+                if (mParams.get(i).token == token) {
+                    mRoots.get(i).changeCanvasOpacity(opaque);
+                    return;
+                }
+            }
+        }
+    }
 }
 
 final class WindowLeaked extends AndroidRuntimeException {