/* 计算两个经纬度之间的距离  结果单位：米  */ public static double  getDistance(String lat1Str, String lng1Str, String lat2Str, String lng2Str) {
      Double lat1 = Double.parseDouble(lat1Str);     Double lng1 = Double.parseDouble(lng1Str);     Double lat2 = Double.parseDouble(lat2Str);     Double lng2 = Double.parseDouble(lng2Str);     double radLat1 = rad(lat1);     double radLat2 = rad(lat2);     double a = radLat1 - radLat2;     double b = rad(lng1) - rad(lng2);     double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +             Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));     s = s * EARTH_RADIUS;     s = Math.round(s * 10000) / 10000;     return s; }

private static double EARTH_RADIUS = 6378137; private static double rad(double d) {
      return d * Math.PI / 180.0; }