Android/J2SE计算两个位置坐标之间的距离

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];

　　}

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;

　　}