title: android:windowBackground="@null" to improve app speed
body: <p>I just read a <a href="http://www.curious-creature.org/2009/03/04/speed-up-your-android-ui/" rel="noreferrer">blogpost by Romain Guy</a> on how to speed up an app UI. He basically says that if your app uses opaque views you can set the background to <code>@null</code> in your <code>Activity</code>'s style using:</p>
  
  <pre><code>&lt;item name="android:windowBackground"&gt;@null&lt;/item&gt;
  </code></pre>
  
  <p>Does this work? I was willing to test this using FPS as he did but I didn't find a clear way of getting that info.</p>
  
  <p>I have read some <a href="http://groups.google.com/group/android-developers/browse_thread/thread/52bb5927f8f5cac3" rel="noreferrer">threads</a> saying you need to do it yourself.
  I am about to add a custom view that draws the FPS in the <code>onDraw()</code> method and calls <code>invalidate()</code> to get call all the time.</p>
  
  <p>Although this works, I would like to know if there is a better way to analyse FPS in an application.</p>