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

    <item android:drawable="@drawable/bg_radiobutton_checked" android:state_selected="true"></item>
    <item android:drawable="@drawable/bg_radiobutton_checked" android:state_checked="true"></item>
    <item android:drawable="@drawable/bg_radiobutton_unchecked" />

</selector>