Activity_main.xml
res/drawable/circle_shape.xml
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
tools:context=".MainActivity"
android:background="#f0f7e7"
>
<!--
To get a circular shape,
we need to apply the same value for width and height
-->
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Circular Shape"
android:layout_centerInParent="true"
android:background="@drawable/circle_shape"
android:textColor="#fff"
/>
</RelativeLayout>
res/drawable/circle_shape.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="oval">
<solid android:color="#e42828"/>
<stroke android:color="#3b91d7" android:width="5dp"/>
<size android:width="250dp" android:height="250dp"/>
</shape>
</item>
</selector>