private String getUrl(LatLng origin, LatLng dest, String directionMode) {

        String str_origin = "origin=" + origin.latitude + "," + origin.longitude;

        String str_destination = "destination=" + dest.latitude + "," + dest.longitude;

        String mode = "mode=" + directionMode;

        String parameters = str_origin + "&" + str_destination + "&" + mode;

        String output = "json";

        String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters + "&key=" + "AIzaSyBbn1GtJKOrz0a4bwoqhhAOlBAlEqNSTEA";

        return url;


    }