How to add a 9patch image to a xml drawable

Question

Hi,

I have the following drawable which draw a rectangle. Can you please tell me how can I add a 9patch image as the background of this drawable?

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
> 
<stroke android:width="1dp" android:color="#FFFFFFFF" /> 
<solid android:color="@android:color/transparent"/>
</shape>

Thank you.