Make background black while playing video.

Change-Id: I31d752c8b7846c16684c5488ea320056092541e4
Fixes: 30231014
diff --git a/res/layout/retail_video.xml b/res/layout/retail_video.xml
index 3393604..62ee775 100644
--- a/res/layout/retail_video.xml
+++ b/res/layout/retail_video.xml
@@ -32,11 +32,16 @@
                 android:layout_marginBottom="@dimen/fallback_view_text_margin_bottom" />
     </FrameLayout>
 
-    <VideoView
-            android:id="@+id/video_content"
+    <FrameLayout android:id="@+id/video_layout"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:layout_gravity="center"
-            android:keepScreenOn="true" />
+            android:keepScreenOn="true"
+            android:background="@android:color/black">
+        <VideoView
+                android:id="@+id/video_content"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_gravity="center" />
+    </FrameLayout>
 
 </merge>
diff --git a/src/com/android/retaildemo/DemoPlayer.java b/src/com/android/retaildemo/DemoPlayer.java
index 58d9a4e..9e63a43 100644
--- a/src/com/android/retaildemo/DemoPlayer.java
+++ b/src/com/android/retaildemo/DemoPlayer.java
@@ -113,11 +113,12 @@
     private void displayFallbackView() {
         if (DEBUG) Log.d(TAG, "Showing the fallback view");
         findViewById(R.id.fallback_layout).setVisibility(View.VISIBLE);
-        mVideoView.setVisibility(View.GONE);
+        findViewById(R.id.video_layout).setVisibility(View.GONE);
     }
 
     private void displayVideoView() {
-        mVideoView.setVisibility(View.VISIBLE);
+        if (DEBUG) Log.d(TAG, "Showing the video view");
+        findViewById(R.id.video_layout).setVisibility(View.VISIBLE);
         findViewById(R.id.fallback_layout).setVisibility(View.GONE);
     }