emotionhero/app/src/main/res/layout/activity_gaming.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary"
    android:keepScreenOn="true"
    tools:context="com.rubenvandeven.emotionhero.GamingActivity">

    <!-- The primary full-screen view. This can be replaced with whatever view
         is needed to present your content, e.g. VideoView, SurfaceView,
         TextureView, etc. -->
    <RelativeLayout
        android:id="@+id/video_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </RelativeLayout>

    <TextView
        android:id="@+id/fullscreen_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:keepScreenOn="true"
        android:text="@string/dummy_content"
        android:textColor="#ffffff"
        android:textSize="50sp"
        android:textStyle="bold" />


    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true">

        <Button
            android:text="@string/restart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/restartButton"
            android:layout_gravity="center_vertical|center_horizontal"
            android:visibility="gone" />

    </FrameLayout>

</FrameLayout>