opencv/samples/android/tutorial-4-opencl/res/layout/activity.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <org.opencv.samples.tutorial4.MyGLSurfaceView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/my_gl_surface_view" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/fps_text_view"
        android:text="FPS:" />

</FrameLayout>