title: Scaling Android MapView markers when a user zooms in/out
body: <p>I've seen a few questions about this but no solid answers.</p>
  
  <p>I have a MapView that can generate up to 1600 locations on the map, based on how far the user zooms in or out. As of now, I have my marker simply set to a drawable within my application. How can I detect if a user has zoomed in/out, then scale the marker accordingly. I'm not concerned with the scaling part, but with the zoom listening part. Has anyone developed a solution to this little issue, or can point me in the correct direction to create my own?</p>
  
  <p>Also, as far as I know, there is not a default marker that Android supplies. Am I correct about this? It would be nice if Android had a built in marker that handles the scaling based on zoom levels for you.</p>