samples/SupportLeanbackShowcase/app/src/main/res/drawable-v21/song_row_background_focused.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <color android:color="#384248"></color>
    </item>
    <item>
        <ripple xmlns:android="http://schemas.android.com/apk/res/android"
                android:color="?android:attr/colorControlHighlight">
            <item android:id="@android:id/mask">
                <shape android:shape="rectangle">
                    <corners android:radius="2dp"/>
                    <solid android:color="#FFFFFF"/>
                </shape>
            </item>

        </ripple>
    </item>

</layer-list>