map view:if one place nearby have more data using number instead
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    https://github.com/vicpenap/VPPMap/raw/master/screenshot.png 
 
  i cannot describe my requirement，i used the pic to show my need,in the pic you can see number :2 9 14,when you click the number,it expand and show the pin.i want finish the effect at android.can you give  me the clue about how to collect data and using number instead.