Add background xml view

background.xml

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

    <solid android:color="@color/colorDark" />
    <size android:width="42dp"
        android:height="42dp"/>

</shape>

This is just simple line to add in the background android:background="@drawable/background_circle"