get value from marker gmap arraylist json

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http://stackoverflow.com – im have database contain lat and long, and i use json parser in android. i want to get the value of latitude and longitude from marker that i click. here is my code: public class GoogleMapActivity extends MapActivity { private ProgressDialog pDialog; Route route; List<GeoPoint> listPoints; JSONParser jParser = new JSONParser(); private static String url_peta_rs = ""; private static final String TAG_SUCCESS = "success"; private static final String TAG_PETA_RS = "peta_rs"; public static final String TAG_NAMA_RS = "nama"; public static fina (HowTos)