android/app/src/main/res/drawable/circle.xml

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

        <solid
            android:color="#397af3"/>

        <size
            android:width="120dp"
            android:height="120dp"/>
    </shape>