Android给定坐标计算距离

float[] results=new float[1];
Location.distanceBetween(latitude,longitude,Double.parseDouble(lat), Double.parseDouble(lng),results);
Log.i("距离", results[0]+"");

private static final double EARTH_RADIUS = 6378.137;
private static double rad(double d) {
return d * Math.PI / 180.0;
}
/**
* 根据两点间经纬度坐标（double值），计算两点间距离，
*
* @param lat1
* @param lng1
* @param lat2
* @param lng2
* @return 距离：单位为公里
*/
public static double DistanceOfTwoPoints(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 * 10000) / 10000;
Log.i("距离",s+"");
return s;
}