title: Maps V2 Marker pressed states
body: <p>In Maps V2, how can I set a pressed state to a Marker?</p>
  
  <p>The setIcon() method takes a BitmapDescriptor; I can't see a way to pass an XML selector which would give a pressed and selected state. </p>
  
  <p>Is the only way to achieve this to override the OnMarkerClickListener and change the image programmatically?</p>