DistanceBetween（）兩個位置

Question

我想要DistanceBetween（）方法代碼，如果我想獲得我的當前位置和覆蓋物品位置之間的距離。預先感謝

Answer 1

不知道你所要求的代碼來計算兩個地理點之間的距離......

如果是這樣，這是在C＃中，不應該有太大的將其轉換成Java;

private double distance(double lat1, double lon1, double lat2, double lon2, char unit) { 
    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; 
    if (unit == 'K') { 
    dist = dist * 1.609344; 
    } else if (unit == 'N') { 
    dist = dist * 0.8684; 
    } 
    return (dist); 
} 

//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
//:: This function converts decimal degrees to radians    ::: 
//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
private double deg2rad(double deg) { 
    return (deg * Math.PI/180.0); 
} 

//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
//:: This function converts radians to decimal degrees    ::: 
//::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 
private double rad2deg(double rad) { 
    return (rad/Math.PI * 180.0); 
} 

Answer 2

在這裏你去：http://codesearch.google.com/codesearch/p?hl=en#uX1GffpyOZk/location/java/android/location/Location.java&q=package:android.git.kernel.org%20file:android/location/Location.java&l=391