app/src/main/res/drawable/roundedbutton.xml
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<shape android:shape="oval">
<solid android:color="#FFFFFF" />
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="oval">
<solid android:color="#FFFFFF" />
</shape>
</item>
</selector>