Android Background Image in XML File

I currently have an application which has the default black background for every slide. What I would like to do is alter the XML files to have a background image. I'm assuming there is a simple command for this but haven't been able to find exactly what I'm looking for. I want an image to the background of my current screen. I don't want the background to ever change, and I would like to put this in my XML file. Here is an example of one of my XML headers... ``` <?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:weightSum="1.0" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:weightSum="9" android:gravity="center" > ... ``` I am assuming there is some simple command such as ``` android:background="file" ```