title: Android: implement auto-updates for my apps?
body: <p>I would like auto-updates to be enabled for my application.  After lots of searching, I can not find any information about how to implements this.  My interpretation is that it is a feature of 2.2 and android marketplace, and will happen automatically.  However, I have a few questions about this that I cannot find answers to on Google:</p>
  
  <ol>
  <li><p>How does this work?  Do I just publish a new version to the Google marketplace and then users are prompted to update their application?  If so, is there a way to control if I want to allow the user to be able to update? (like, if I publish 1.1, I would like to allow an update. but not for 2.0).  </p></li>
  <li><p>Do I need to specify anything in my manifest file or anywhere else in my app?</p></li>
  <li><p>If this is a 2.2 feature, will it work if my app is 2.1 compliant? (I assume it would not work for users running 2.1, but want to make sure being 2.1 compliant would not break it).</p></li>
  </ol>
  
  <p>Thank you.</p>