How to make ripple effect to the button in android on the example of a round button

round_button.xml

//link: https://stackoverflow.com/questions/9884202/custom-circle-button

//place to the drawable folder as ripple_effect.xml

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="@android:color/holo_green_light">
    <item>
        <shape android:shape="rectangle">
            <corners android:radius="200dp"/>
            <solid android:color="@android:color/holo_green_dark"/>
        </shape>
    </item>
</ripple>

//using 
//android:background="@drawable/ripple_effect"
//android:clickable="true"
//android:focusable="true"