根据两个坐标点获取两个坐标点之间的距离，代码奉上，原理不懂…
/*** 计算两个坐标点之间的距离，单位米* @param lat1//实际坐标点* @param lng1//实际坐标点* @param lat2 //目标坐标点* @param lng2 //目标坐标点* @return 返回的是double类型*/public static double getDistance(double lat1, double lng1, double lat2,double lng2) {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 * 10000d) / 10000d;s = s * 1000;return s;}private static double rad(double d){return d * Math.PI / 180.0;}private static double EARTH_RADIUS = 6378.137;
