res/drawable/radiobutton_avatar.xml

   1 <?xml version="1.0" encoding="utf-8"?>
   2 <shape xmlns:android="http://schemas.android.com/apk/res/android"
   3     android:shape="rectangle">
   4     <size android:width="20dp"
   5         android:height="20dp" />
   6     <solid android:color="@android:color/black"/>
   7 </shape>