LatLong

/**
 * Calculate the distance between two geopoints (Latitude and Longitude)
 * in WGS84
 * 
 * @param latitudeOne
 * @param longituteOne
 * @param latituteTwo
 * @param longituteTwo
 * 
 * @return distance the distance in kilometers
 */
public static double calculateDistance(
                                       double latitudeOne,
                                       double longituteOne,
                                       double latituteTwo,
                                       double longituteTwo) {
        double AVERAGE_RADIUS_OF_EARTH = 6371;
        
        double latDistance = Math.toRadians(latitudeOne - latituteTwo);
        double lngDistance = Math.toRadians(longituteOne - longituteTwo);
        
        double a = (Math.sin(latDistance / 2) * Math.sin(latDistance / 2)) + (Math.cos(Math.toRadians(latitudeOne))) * (Math.cos(Math.toRadians(latituteTwo))) * (Math.sin(lngDistance / 2)) * (Math.sin(lngDistance / 2));
        
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        
        double distance = AVERAGE_RADIUS_OF_EARTH * c;
        
        return distance;
}