CodeDogg

import com.google.android.maps.GeoPoint;

public class DistanceCalculator {

private double Radius;

// R = earth’s radius (mean radius = 6,371km)

// Constructor

DistanceCalculator(double R) {

Radius = R;

}

public double CalculationByDistance(GeoPoint StartP, GeoPoint EndP) {

double lat1 = StartP.getLatitudeE6()/1E6;

double lat2 = EndP.getLatitudeE6()/1E6;

double lon1 = StartP.getLongitudeE6()/1E6;

double lon2 = EndP.getLongitudeE6()/1E6;

double dLat = Math.toRadians(lat2-lat1);

double dLon = Math.toRadians(lon2-lon1);

double a = Math.sin(dLat/2) * Math.sin(dLat/2) +

Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *

Math.sin(dLon/2) * Math.sin(dLon/2);

double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

return Radius * c;

}

}