It is unrealistic because people collect points and then show them as polyline, polygon or just dots not the other way around. It is unrealistic because Google MapActivity on Android is different from the full scale Google Map API. It is trivial because any Polyline (or Polygon) should be stored as some set of points and therefore all you need to do is to open a documentation to find out how exactly to do this. For example, if you open http://code.google.com/apis/maps/documentation/javascript/3.3/reference.html#Polyline you will find getPath()method to get MVCArray<http://code.google.com/apis/maps/documentation/javascript/3.3/reference.html#MVCArray> <LatLng<http://code.google.com/apis/maps/documentation/javascript/3.3/reference.html#LatLng> >.
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