templates/activities/FullscreenActivity/root/res/values-v11/styles.xml

<resources>

    <style name="FullscreenTheme" parent="android:Theme.Holo">
        <item name="android:actionBarStyle">@style/FullscreenActionBarStyle</item>
        <item name="android:windowActionBarOverlay">true</item>
        <item name="android:windowBackground">@null</item>
        <item name="buttonBarStyle">?android:attr/buttonBarStyle</item>
        <item name="buttonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
    </style>

    <style name="FullscreenActionBarStyle" parent="android:Widget.Holo.ActionBar">
        <item name="android:background">@color/black_overlay</item>
    </style>

</resources>