Put ImageView exactly over VideoView

I need to put a ImageView exactly over a VideoView. When I use this code in a RelativLayout ``` <VideoView android:id="@+id/videoView1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" /> <ImageView android:id="@+id/imageView1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentTop="true" android:layout_alignParentLeft="true" /> ``` the VideoView is shown on the top, the ImageView is centered vertically. What can be done to also center the ImageView, that both Views are at the same position and have the same size, when a video and a picture with the same resolution are displayed?