android - Circle shape in XML drawable file

activity_main.xml

 <?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>         <!--             android:shape                 Keyword. Defines the type of shape. Valid values are:                      rectangle : A rectangle that fills the containing View. This is the default shape.                     oval : An oval shape that fits the dimensions of the containing View.                     line : A horizontal line that spans the width of the containing View. This                            shape requires the <stroke> element to define the width of the line.                     ring : A ring shape.         -->         <shape android:shape="oval">             <solid android:color="#e42828"/>             <stroke android:color="#3b91d7" android:width="5dp"/>             <!-- Set the same value for both width and height to get a circular shape -->             <size android:width="250dp" android:height="250dp"/>         </shape>     </item> </selector>