title: Google Maps Android API v2 getVisibleRegion() returns 0
body: <p>I am using the new Google Maps Android API v2 and need to detect latlng coordinates for the corners of my screen view. I use mMap.getProjection().getVisibleRegion() to do this, which works fine the first time I load the program, but if I leave the program and then re-open it (either via the back button or the home button) getVisibleRegion() returns latlng coordinates that are all (0.0, 0.0). I have a workaround where I save the VisibleRegion object as a global in the application class when I first open the program, but this seems like a bad idea. Anyone understand why the latlng coordinates go to zero (but not null) when re-opening? Thanks!</p>
  
  <p>Edit: sometimes initial load gives a (0.0, 0.0) Visible Region so my workaround is not viable. Using getProjection().fromScreenLocation(point) also returns 0.</p>