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我想通過把它在onLocationChanged方法經常用它來計算我的當前位置和標記計算距離的Android
private 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);
dist = dist * 60 * 1.1515;
return (dist);
}
private double deg2rad(double deg) {
return (deg * Math.PI/180.0);
}
private double rad2deg(double rad) {
return (rad * 180.0/Math.PI);
}
之間的距離,我將能夠更新呢?我知道proximity
將是一個更優雅的解決方案,但我遇到了問題,而且我的時間緊迫。
的'Location'類已經把距離計算。 http://developer.android.com/reference/android/location/Location.html – 2013-03-18 09:40:12
這是不是真的涉及到Android ... – RvdK 2013-03-18 09:44:17