activity_main.xml

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/flashlight_background"
    tools:context=".MainActivity" >

    <SurfaceView
        android:id="@+id/PREVIEW"
        android:layout_width="1dip"
        android:layout_height="1dip" />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/power_button"
        android:background="@null"
        android:src="@drawable/flashlight_off"
        android:layout_gravity="center"
        android:adjustViewBounds="false" />

    </FrameLayout>