drawable-v21button_overlay.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:colorControlHighlight">
    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <corners android:radius="@dimen/button_radius" />
            <solid android:color="@android:color/white" />
        </shape>
    </item>
</ripple>

drawablebutton_overlay.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <corners android:radius="@dimen/button_radius" />
            <solid android:color="#14000000" />
        </shape>
    </item>
    <item android:state_focused="true">
        <shape android:shape="rectangle">
            <corners android:radius="@dimen/button_radius" />
            <solid android:color="#07000000" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <corners android:radius="@dimen/button_radius" />
            <solid android:color="#00000000" />
        </shape>
    </item>
</selector>