title: ZXing Autofocus issue
body: <p>I write an application for Motorola Xoom tablet with Android 3.1 for my master thesis that can scan multiple QR Codes in real time with it's camera and that displays additional information in the display over recognised QR Codes.</p>
  
  <p>The recognition is done with the ZXing android app (<a href="http://code.google.com/p/zxing/" rel="nofollow">http://code.google.com/p/zxing/</a>), I basically just changed the code of the ZXing app so that it can recognise multiple QR Codes at the same time and can do this scan continually, without freezing after a successful scan like the original app does. So my app is basically the ZXing app with continous scanning of multiple QR Codes.</p>
  
  <p>But I'm facing a problem:</p>
  
  <ol>
  <li><p>The ZXing app makes some sort of continous autofocus. It starts the
  autofocus and when it is finished it automatically starts the
  autofocus again. But this method somehow makes the camera brightness
  settings too bright, so that the camera cannot recognize the QR
  Codes because the image is almost totally white. Disabling the autofocus solves the problem, but I need autofocus because otherwise the recognition of the QR Codes is only possible at a certain distance.</p>
  
  <ul>
  <li>How can I change the brightness settings of the camera?</li>
  <li>Does somebody know another possibility for autofocus?</li>
  </ul></li>
  </ol>