title: How do I make a drawable from multiple images?
body: <p>I have three 9-patch PNG's which together make up the background for a button (left side, middle, right side).  I would like to combine these three images together in a drawable which I can specify as the background for a button in XML, something along the lines of:</p>
  
  <p><code>res/drawable/button_background.xml:</code></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;nine-patch xmlns:android="http://schemas.android.com/apk/res/android"
  android:src="@drawable/button_left_side" /&gt;
  
  &lt;nine-patch android:src="@drawable/button_middle" /&gt;
  
  &lt;nine-patch android:src="@drawable/button_right_side" /&gt;
  </code></pre>
  
  <p><code>res/layout/main.xml:</code></p>
  
  <pre><code>&lt;button android:background="@drawable/button_background" /&gt;
  </code></pre>
  
  <p>Is this possible?</p>