title: Google Map Android API v2 can't display map in play store application
body: <p>I am working with the <code>Google Map Android API v2</code> in an android application.</p>
  
  <p>It works fine with the <strong>unsigned apk</strong> on a different device. But when I have signed the apk and uploaded my application to the Play Store the downloaded application displays a white screen instead of the map. </p>