Distance between two coordinates - Java

distance_between_coordinates.java

    public static double calcDistanceBetweenCoords(Double origLat, Double origLng, Double destLat, Double destLng)
    {
        double result = 0;

        if (origLat == null || origLng == null || destLat == null || destLng == null) {
            return result;
        }

        // converte as coordenadas para radianos
        origLat = Math.toRadians(origLat);
        origLng = Math.toRadians(origLng);
        destLat = Math.toRadians(destLat);
        destLng = Math.toRadians(destLng);

        // earth radius in quilometers
        int earthRadius = 6371;

        // adjust of 16% for better proximity to reality
        double adjust = 1.16;

        result = (earthRadius * Math.acos(Math.cos(origLat) * Math.cos(destLat) * Math.cos(destLng - origLng) + Math.sin(origLat) * Math.sin(destLat)));
        result *= adjust;

        return result; // result in km
    }