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];
}
在其他設備若沒有類似android的Location的distanceBetween方法開採用如下代碼獲取:
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;
}
//將角度轉換爲弧度
static double deg2rad(double degree) {
return degree / 180 * Math.PI;
}
//將弧度轉換爲角度
static double rad2deg(double radian) {
return radian * 180 / Math.PI;
}
最後的返回值單位爲英里,1英里=1.609344公里 =0.8684海里