private String getDirectionsUrl(LatLng origin,LatLng dest)
    {
        // Origin of route
        String str_origin = "origin="+origin.latitude+","+origin.longitude;

        // Destination of route
        String str_dest = "destination="+dest.latitude+","+dest.longitude;

        // Sensor enabled
        String sensor = "sensor=false";

        // Building the parameters to the web service
        String parameters = str_origin+"&"+str_dest+"&"+sensor+"&"+"mode="+mode;

        // Output format
        String output = "json";

        // Building the url to the web service
        url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters;

        return url;
    }