title: Custom spinner animation not smooth enough: framesCount and frameDuration error
body: <p>I'm working on a custom indeterminate spinner, I browsed through the SDK for some pointers and found the indeterminate spinner xml file made by Google:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
  android:drawable="@drawable/spinner_black_16"
  android:pivotX="50%"
  android:pivotY="50%"
  android:framesCount="12"
  android:frameDuration="100" /&gt;
  </code></pre>
  
  <p>When I use this as a drawable in my own project I get errors about <code>android:framesCount</code> and <code>android:framesDuration</code>. After looking on Google for a while I found <a href="http://code.google.com/p/android/issues/detail?id=19248">this</a> link to an issue report. </p>
  
  <p>My questions is: Is there any workaround so i can still use <code>android:framesCount</code> and <code>android:framesDuration</code>? Or is there any other way I can make my custom spinner rotate smooth?</p>