amm_sdk_sample/res/drawable/mm_checkbox_mini.xml

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
	<item android:state_checked="true" android:drawable="@drawable/mm_checkbox_mini_checked" />
	<item android:state_checked="false" android:drawable="@drawable/mm_checkbox_mini_normal" />
</selector>