Ripple effect

<?xml version="1.0" encoding="utf-8"?>
<!-- in drawable-v21 folder-->
<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:colorControlHighlight">

    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <solid android:color="?android:colorAccent" />
        </shape>
    </item>

    <item>
        <shape android:shape="rectangle">
            <!-- put your background color here-->
            <solid android:color="#9acc3e" />
        </shape>
    </item>

</ripple>