Android计算地图上两点距离

最近项目要用到定位地图上两个坐标的位置，网上找了一下发现：

在android中可采用如下代码获取距离:

public double getDistance(double lat1, double lon1, double lat2, double lon2) {           float[] results=new float[1];           Location.distanceBetween(lat1, lon1, lat2, lon2, results);           return results[0];       }

在其他设备若没有类似android的Location的distanceBetween方法开采用如下代码获取:

double distance(double lat1, double lon1, double lat2, double lon2) {           double theta = lon1 - lon2;           double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))                       + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))                       * Math.cos(deg2rad(theta));           dist = Math.acos(dist);           dist = rad2deg(dist);           double miles = dist * 60 * 1.1515;           return miles;       }       //将角度转换为弧度       static double deg2rad(double degree) {           return degree / 180 * Math.PI;       }       //将弧度转换为角度       static double rad2deg(double radian) {           return radian * 180 / Math.PI;       }

今天还发现了这样一种计算距离的方法：

public static double getDistatce(double paramDouble1, double paramDouble2, double paramDouble3, double paramDouble4)  {    double d1 = 3.141592653589793D * (paramDouble2 - paramDouble1) / 180.0D;    double d2 = 3.141592653589793D * (paramDouble4 - paramDouble3) / 180.0D;    double d3 = Math.sin(d1 / 2.0D) * Math.sin(d1 / 2.0D) + Math.cos(3.141592653589793D * paramDouble1 / 180.0D) * Math.cos(3.141592653589793D * paramDouble2 / 180.0D) * Math.sin(d2 / 2.0D) * Math.sin(d2 / 2.0D);    return 6371.0D * (2.0D * Math.atan2(Math.sqrt(d3), Math.sqrt(1.0D - d3)));  }

这个计算得出的结果是英里,如果要转换成公里,需要乘以 1.609344 ,若是海里需要乘以 0.8684

自己试一下喔！

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