title: Android & Google Maps - close info window with back button
body: <p>I have an activity that holds a fragment with Google Map view in it. App adds several dozens of markers to the MapView, using MarkerManager and ClusterRenderer to form clusters.</p>
  
  <p>The problem is that when I have marker's InfoWindow opened and I press hardware Back button, it closes the app. Instead of that, I would like to have the InfoWindow closed.</p>
  
  <p>Is there any straightforward way to achieve this?</p>