Android MapView: how to show grouped annotations? -

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i create android app shows map of united states annotations in different cities; when zoom in zone see annotations in single places (e.g. see newyork:10 pictures, zoom in ny , see 6 annotations in central park , 4 in 5th.avenue, example). has made similar thing (like in iphone photo application and/or earthquake sample shown on web using js googlemaps ?)

thanks in advance , greetings ! c.


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