VideoView Full screen in android application

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <VideoView android:id="@+id/videoViewRelative"
         android:layout_alignParentTop="true"
         android:layout_alignParentBottom="true"
         android:layout_alignParentLeft="true"
         android:layout_alignParentRight="true"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent">
    </VideoView>

</RelativeLayout>

VideoView videoview=new VideoView(getContext());
        RelativeLayout.LayoutParams rlvideo=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT);
        rlvideo.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        rlvideo.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        rlvideo.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
        rlvideo.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        videoview.setLayoutParams(rlvideo);