<?xml version="1.0" encoding="utf-8"?>
<selector>
    <item n1:state_checked="true" n1:drawable="@drawable/abc_btn_radio_to_on_mtrl_015"
      xmlns:n1="http://schemas.android.com/apk/res/android" />
    <item n2:drawable="@drawable/abc_btn_radio_to_on_mtrl_000"
      xmlns:n2="http://schemas.android.com/apk/res/android" />
</selector>