diff --git a/core/java/android/app/ActivityView.java b/core/java/android/app/ActivityView.java
index 097c64e723aed..c29d75e516efa 100644
--- a/core/java/android/app/ActivityView.java
+++ b/core/java/android/app/ActivityView.java
@@ -53,6 +53,7 @@ public class ActivityView extends ViewGroup {
     private int mHeight;
     private Surface mSurface;
     private int mLastVisibility;
+    private ActivityViewCallback mActivityViewCallback;
 
     // Only one IIntentSender or Intent may be queued at a time. Most recent one wins.
     IIntentSender mQueuedPendingIntent;
@@ -254,6 +255,25 @@ public class ActivityView extends ViewGroup {
         }
     }
 
+    /**
+     * Set the callback to use to report certain state changes.
+     * @param callback The callback to report events to.
+     *
+     * @see ActivityViewCallback
+     */
+    public void setCallback(ActivityViewCallback callback) {
+        mActivityViewCallback = callback;
+    }
+
+    public static abstract class ActivityViewCallback {
+        /**
+         * Called when all activities in the ActivityView have completed and been removed. Register
+         * using {@link ActivityView#setCallback(ActivityViewCallback)}. Each ActivityView may
+         * have at most one callback registered.
+         */
+        public abstract void onAllActivitiesComplete(ActivityView view);
+    }
+
     private class ActivityViewSurfaceTextureListener implements SurfaceTextureListener {
         @Override
         public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width,
@@ -313,6 +333,22 @@ public class ActivityView extends ViewGroup {
             if (DEBUG) Log.v(TAG, "setVisible(): container=" + container + " visible=" + visible +
                     " ActivityView=" + mActivityViewWeakReference.get());
         }
+
+        @Override
+        public void onAllActivitiesComplete(IBinder container) {
+            final ActivityView activityView = mActivityViewWeakReference.get();
+            if (activityView != null) {
+                final ActivityViewCallback callback = activityView.mActivityViewCallback;
+                if (callback != null) {
+                    activityView.post(new Runnable() {
+                        @Override
+                        public void run() {
+                            callback.onAllActivitiesComplete(activityView);
+                        }
+                    });
+                }
+            }
+        }
     }
 
     private static class ActivityContainerWrapper {
diff --git a/core/java/android/app/IActivityContainerCallback.aidl b/core/java/android/app/IActivityContainerCallback.aidl
index 7f6d2c3570ae5..99d0a6f8189e5 100644
--- a/core/java/android/app/IActivityContainerCallback.aidl
+++ b/core/java/android/app/IActivityContainerCallback.aidl
@@ -21,4 +21,5 @@ import android.os.IBinder;
 /** @hide */
 interface IActivityContainerCallback {
     oneway void setVisible(IBinder container, boolean visible);
+    oneway void onAllActivitiesComplete(IBinder container);
 }
diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index e4b196ee1bb02..685da13b8ada0 100755
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -3669,6 +3669,7 @@ final class ActivityStack {
                 mStacks.remove(this);
                 mStacks.add(0, this);
             }
+            mActivityContainer.onTaskListEmpty();
         }
     }
 
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index be37ee2bc6cd2..5a79e662f29c9 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -126,6 +126,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
     static final int HANDLE_DISPLAY_CHANGED = FIRST_SUPERVISOR_STACK_MSG + 6;
     static final int HANDLE_DISPLAY_REMOVED = FIRST_SUPERVISOR_STACK_MSG + 7;
     static final int CONTAINER_CALLBACK_VISIBILITY = FIRST_SUPERVISOR_STACK_MSG + 8;
+    static final int CONTAINER_CALLBACK_TASK_LIST_EMPTY = FIRST_SUPERVISOR_STACK_MSG + 9;
 
     private final static String VIRTUAL_DISPLAY_BASE_NAME = "ActivityViewVirtualDisplay";
 
@@ -523,7 +524,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
     }
 
     void pauseChildStacks(ActivityRecord parent, boolean userLeaving, boolean uiSleeping) {
-		// TODO: Put all stacks in supervisor and iterate through them instead.
+        // TODO: Put all stacks in supervisor and iterate through them instead.
         for (int displayNdx = mActivityDisplays.size() - 1; displayNdx >= 0; --displayNdx) {
             ArrayList<ActivityStack> stacks = mActivityDisplays.valueAt(displayNdx).mStacks;
             for (int stackNdx = stacks.size() - 1; stackNdx >= 0; --stackNdx) {
@@ -2931,12 +2932,24 @@ public final class ActivityStackSupervisor implements DisplayListener {
                 } break;
                 case CONTAINER_CALLBACK_VISIBILITY: {
                     final ActivityContainer container = (ActivityContainer) msg.obj;
-                    try {
-                        // We only send this message if mCallback is non-null.
-                        container.mCallback.setVisible(container.asBinder(), msg.arg1 == 1);
-                    } catch (RemoteException e) {
+                    final IActivityContainerCallback callback = container.mCallback;
+                    if (callback != null) {
+                        try {
+                            callback.setVisible(container.asBinder(), msg.arg1 == 1);
+                        } catch (RemoteException e) {
+                        }
                     }
-                }
+                } break;
+                case CONTAINER_CALLBACK_TASK_LIST_EMPTY: {
+                    final ActivityContainer container = (ActivityContainer) msg.obj;
+                    final IActivityContainerCallback callback = container.mCallback;
+                    if (callback != null) {
+                        try {
+                            callback.onAllActivitiesComplete(container.asBinder());
+                        } catch (RemoteException e) {
+                        }
+                    }
+                } break;
             }
         }
     }
@@ -3141,6 +3154,10 @@ public final class ActivityStackSupervisor implements DisplayListener {
             return true;
         }
 
+        void onTaskListEmpty() {
+            mHandler.obtainMessage(CONTAINER_CALLBACK_TASK_LIST_EMPTY, this).sendToTarget();
+        }
+
         @Override
         public String toString() {
             return mIdString + (mActivityDisplay == null ? "N" : "A");