Android计算地图上两点距离

 368  2012/02/22 10:47:00


Java代码

  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:

  Java代码

  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;

  }

  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

本文转自:http://www.cnblogs.com/weixing/archive/2012/02/22/2362717.html