Update preview controls on deleting all items.

Bug: 11219537
Change-Id: I897b65bd7c594b904aa29462e056a10d0e9c52a2
diff --git a/src/com/android/camera/CameraActivity.java b/src/com/android/camera/CameraActivity.java
index ab46e02..b971b28 100644
--- a/src/com/android/camera/CameraActivity.java
+++ b/src/com/android/camera/CameraActivity.java
@@ -347,6 +347,7 @@
 
                     if(!arePreviewControlsVisible()) {
                         setPreviewControlsVisibility(true);
+                        CameraActivity.this.setSystemBarsVisibility(false);
                     }
                 }
 
@@ -1381,7 +1382,10 @@
         }
         hideUndoDeletionBar(false);
         mDataAdapter.executeDeletion(CameraActivity.this);
-        updateActionBarMenu(mFilmStripView.getCurrentId());
+
+        int currentId = mFilmStripView.getCurrentId();
+        updateActionBarMenu(currentId);
+        mFilmStripListener.onCurrentDataCentered(currentId);
     }
 
     public void showUndoDeletionBar() {