Titanium - Get Directions Using Google Direction Services

Ti.Geolocation.getCurrentPosition(function(evt) {
                var origin = String(evt.coords.latitude + ',' + evt.coords.longitude),
                travelMode = 'walking',
                destination = String(yourLatitude + ',' + yourLongitude),
                url = "http://maps.google.com/maps/api/directions/xml?mode="
                        + travelMode + "&origin="
                        + origin + "&destination="
                        + destination +"&sensor=false";
                xhr = Titanium.Network.createHTTPClient();
                xhr.open('GET',url);

                Ti.API.info('>>> go get data for Rgeocode! ...URL: ' + url);

                xhr.onload = function(e){
                    var xml = this.responseXML,
                    points = [],
                    steps = xml.documentElement.getElementsByTagName("step"),
                    totalSteps = steps.length;

                    for (var i=0; i < totalSteps; i++) {
                        var startLocation = steps.item(i).getElementsByTagName("start_location");
                        startLatitude = startLocation.item(0).getElementsByTagName("lat").item(0).text,
                        startLongitude = startLocation.item(0).getElementsByTagName("lng").item(0).text;    

                        points.push({latitude:startLatitude, longitude:startLongitude});                
                    }

                    // Get last point and add it to the array, as we are only parsing <start_location>
                    var finalLocation = steps.item(totalSteps - 1).getElementsByTagName("end_location"),
                    finalLatitude = finalLocation.item(0).getElementsByTagName("lat").item(0).text,
                    finalLongitude = finalLocation.item(0).getElementsByTagName("lng").item(0).text;

                    points.push({latitude:finalLatitude, longitude:finalLongitude});

                    // Create route and annotations
                    var route = {
                        name:"bonVoyage",
                        points:points,
                        color:"blue",
                        width:6
                       }, startAnnotation = Ti.Map.createAnnotation({
                           pincolor: Ti.Map.ANNOTATION_RED,
                           latitude: points[0].latitude,
                           longitude: points[0].longitude,
                           title: 'Current location'
                       }), endAnnotation = Ti.Map.createAnnotation({
                           pincolor: Ti.Map.ANNOTATION_RED,
                           latitude: points[points.length - 1].latitude,
                           longitude: points[points.length - 1].longitude,
                           title: 'Destination'
                       });

                    // Add elements
                    mapView.addRoute(route);
                    mapView.addAnnotation(startAnnotation);
                    mapView.addAnnotation(endAnnotation);
                };  

                xhr.send();        
            });