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RouteTaskSolveRouteAsync Method

Solves a route with the specified parameters.

Namespace:  Esri.ArcGISRuntime.Tasks.NetworkAnalysis
Assembly:  Esri.ArcGISRuntime (in Esri.ArcGISRuntime.dll) Version: 100.9.0.0
Syntax
C#
public Task<RouteResult> SolveRouteAsync(
	RouteParameters routeParameters
)

Parameters

routeParameters
Type: Esri.ArcGISRuntime.Tasks.NetworkAnalysisRouteParameters
Parameters to indicate guidelines required when determining the route to each stop.

Return Value

Type: TaskRouteResult
The task object representing the asynchronous solve route operation. The value of the task result is a RouteResult object.
Examples

Android

Example Name: OfflineRouting

Solve a route on-the-fly using offline data.

Code example screen shot.

C#
// Copyright 2019 Esri.
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific 
// language governing permissions and limitations under the License.

using Android.App;
using Android.OS;
using Android.Widget;
using ArcGISRuntime;
using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks.NetworkAnalysis;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;

namespace ArcGISRuntimeXamarin.Samples.OfflineRouting
{
    [Activity(ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Offline routing",
        category: "Network analysis",
        description: "Solve a route on-the-fly using offline data.",
        instructions: "Tap near a road to start adding a stop to the route, tap again to place it on the map. A number graphic will show its order in the route. After adding at least 2 stops, a route will display. Choose \"Fastest\" or \"Shortest\" to control how the route is optimized. The route will update on-the-fly while moving stops. The green box marks the boundary of the routable area provided by the offline data. This sample limits routes to 5 stops for performance reasons.",
        tags: new[] { "connectivity", "disconnected", "fastest", "locator", "navigation", "network analysis", "offline", "routing", "routing", "shortest", "turn-by-turn" })]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("567e14f3420d40c5a206e5c0284cf8fc")]
    [ArcGISRuntime.Samples.Shared.Attributes.AndroidLayout("OfflineRouting.axml")]
    public class OfflineRouting : Activity
    {
        // Hold references to the UI controls.
        private MapView _myMapView;
        private TextView _instructionLabel;
        private Spinner _travelModeSpinner;
        private Button _resetButton;

        // Graphics overlays for holding graphics.
        private GraphicsOverlay _stopsOverlay;
        private GraphicsOverlay _routeOverlay;

        // Route task and parameters.
        private RouteTask _offlineRouteTask;
        private RouteParameters _offlineRouteParameters;

        // List of travel modes, like 'Fastest' and 'Shortest'.
        private List<TravelMode> _availableTravelModes;

        // The area covered by the geodatabase used for offline routing.
        private readonly Envelope _routableArea = new Envelope(new MapPoint(-13045352.223196, 3864910.900750, 0, SpatialReferences.WebMercator),
            new MapPoint(-13024588.857198, 3838880.505604, 0, SpatialReferences.WebMercator));

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Offline routing";

            CreateLayout();
            Initialize();
        }

        private async void Initialize()
        {
            try
            {
                // Get the paths to resources used by the sample.
                string basemapTilePath = DataManager.GetDataFolder("567e14f3420d40c5a206e5c0284cf8fc", "streetmap_SD.tpk");
                string networkGeodatabasePath = DataManager.GetDataFolder("567e14f3420d40c5a206e5c0284cf8fc", "sandiego.geodatabase");

                // Create the tile cache representing the offline basemap.
                TileCache tiledBasemapCache = new TileCache(basemapTilePath);

                // Create a tiled layer to display the offline tiles.
                ArcGISTiledLayer offlineTiledLayer = new ArcGISTiledLayer(tiledBasemapCache);

                // Create a basemap based on the tile layer.
                Basemap offlineBasemap = new Basemap(offlineTiledLayer);

                // Create a new map with the offline basemap.
                Map theMap = new Map(offlineBasemap);

                // Set the initial viewpoint to show the routable area.
                theMap.InitialViewpoint = new Viewpoint(_routableArea);

                // Show the map in the map view.
                _myMapView.Map = theMap;

                // Create overlays for displaying the stops and the calculated route.
                _stopsOverlay = new GraphicsOverlay();
                _routeOverlay = new GraphicsOverlay();

                // Create a symbol and renderer for symbolizing the calculated route.
                SimpleLineSymbol routeSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 2);
                _routeOverlay.Renderer = new SimpleRenderer(routeSymbol);

                // Add the stops and route overlays to the map.
                _myMapView.GraphicsOverlays.Add(_stopsOverlay);
                _myMapView.GraphicsOverlays.Add(_routeOverlay);

                // Create the route task, referring to the offline geodatabase with the street network.
                _offlineRouteTask = await RouteTask.CreateAsync(networkGeodatabasePath, "Streets_ND");

                // Get the list of available travel modes.
                _availableTravelModes = _offlineRouteTask.RouteTaskInfo.TravelModes.ToList();

                // Update the UI with the travel modes list.
                ArrayAdapter<string> spinnerListAdapter = new ArrayAdapter<string>(this,
                    Android.Resource.Layout.SimpleSpinnerItem, _availableTravelModes.Select(travelMode => travelMode.Name).ToArray());
                _travelModeSpinner.Adapter = spinnerListAdapter;
                _travelModeSpinner.SetSelection(0);

                // Create the default parameters.
                _offlineRouteParameters = await _offlineRouteTask.CreateDefaultParametersAsync();

                // Display the extent of the road network on the map.
                DisplayBoundaryMarker();

                // Now that the sample is ready, hook up the tapped and hover events.
                _myMapView.GeoViewTapped += MapView_Tapped;
                _travelModeSpinner.ItemSelected += TravelMode_SelectionChanged;
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e);
                ShowMessage("Couldn't start sample", "There was a problem starting the sample. See debug output for details.");
            }
        }

        private void DisplayBoundaryMarker()
        {
            // Displaying the boundary marker helps avoid choosing a non-routable destination.
            SimpleLineSymbol boundarySymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.LawnGreen, 5);
            Graphic boundary = new Graphic(_routableArea, boundarySymbol);
            GraphicsOverlay boundaryOverlay = new GraphicsOverlay();
            boundaryOverlay.Graphics.Add(boundary);
            _myMapView.GraphicsOverlays.Add(boundaryOverlay);
        }

        private void ResetRoute()
        {
            _routeOverlay.Graphics.Clear();
            _stopsOverlay.Graphics.Clear();
        }

        private async void UpdateRoute(TravelMode selectedTravelMode)
        {
            try
            {
                // Create a list of stops.
                List<Stop> stops = new List<Stop>();

                // Add a stop to the list for each graphic in the stops overlay.
                foreach (Graphic stopGraphic in _stopsOverlay.Graphics)
                {
                    Stop stop = new Stop((MapPoint) stopGraphic.Geometry);
                    stops.Add(stop);
                }

                if (stops.Count < 2)
                {
                    // Don't route, there's no where to go (and the route task would throw an exception).
                    return;
                }

                // Configure the route parameters with the list of stops.
                _offlineRouteParameters.SetStops(stops);

                // Configure the travel mode.
                _offlineRouteParameters.TravelMode = selectedTravelMode;

                // Solve the route.
                RouteResult offlineRouteResult = await _offlineRouteTask.SolveRouteAsync(_offlineRouteParameters);

                // Clear the old route result.
                _routeOverlay.Graphics.Clear();

                // Get the geometry from the route result.
                Polyline routeGeometry = offlineRouteResult.Routes.First().RouteGeometry;

                // Note: symbology left out here because the symbology was set once on the graphics overlay.
                Graphic routeGraphic = new Graphic(routeGeometry);

                // Display the route.
                _routeOverlay.Graphics.Add(routeGraphic);
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e);
                ShowMessage("Couldn't update route", "There was an error updating the route. See debug output for details. Stop selection has been reset.");
            }
        }

        private async void AddStop(Android.Graphics.PointF tappedPosition)
        {
            try
            {
                // Get the location on the map.
                MapPoint tappedLocation = _myMapView.ScreenToLocation(tappedPosition);

                // Name the stop by its number.
                string stopName = $"{_stopsOverlay.Graphics.Count + 1}";

                // Create a pushpin marker for the stop.
                PictureMarkerSymbol pushpinMarker = await GetPictureMarker();

                // Create the text symbol for labeling the stop.
                TextSymbol stopSymbol = new TextSymbol(stopName, Color.White, 15,
                    HorizontalAlignment.Center, VerticalAlignment.Middle);
                stopSymbol.OffsetY = 15;

                // Create a combined symbol with the pushpin and the label.
                CompositeSymbol combinedSymbol = new CompositeSymbol(new MarkerSymbol[] {pushpinMarker, stopSymbol});

                // Create the graphic from the geometry and the symbology.
                Graphic newStopGraphic = new Graphic(tappedLocation, combinedSymbol);

                // Add the stop to the overlay.
                _stopsOverlay.Graphics.Add(newStopGraphic);
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e);
                ShowMessage("Couldn't select or add stop", "Couldn't select or add stop. See debug output for details.");
            }
        }

        private async Task<PictureMarkerSymbol> GetPictureMarker()
        {
            // Get current assembly that contains the image.
            Assembly currentAssembly = Assembly.GetExecutingAssembly();

            // Get image as a stream from the resources.
            // Picture is defined as EmbeddedResource and DoNotCopy.
            Stream resourceStream = currentAssembly.GetManifestResourceStream(
                "ArcGISRuntime.Resources.PictureMarkerSymbols.pin_blue.png");

            // Create new symbol using asynchronous factory method from stream.
            PictureMarkerSymbol pinSymbol = await PictureMarkerSymbol.CreateAsync(resourceStream);
            pinSymbol.Width = 50;
            pinSymbol.Height = 50;
            pinSymbol.LeaderOffsetX = 30;
            pinSymbol.OffsetY = 14;

            return pinSymbol;
        }

        private void ResetButton_Click(object sender, EventArgs e) => ResetRoute();

        private void MapView_Tapped(object sender, GeoViewInputEventArgs e)
        {
            // Make sure the user isn't adding too many stops.
            if (_stopsOverlay.Graphics.Count >= 5)
            {
                ShowMessage("Can't add stop.", "Sample limits to 5 stops per route.");
                return;
            }

            // Make sure the stop is valid before proceeding.
            if (!GeometryEngine.Contains(_routableArea, e.Location))
            {
                ShowMessage("Can't add stop.", "That location is outside of the area where offline routing data is available.");
                return;
            }

            // Add the stop.
            AddStop(e.Position);

            // Update the route with the final list of stops.
            TravelMode selectedTravelMode = _availableTravelModes[_travelModeSpinner.SelectedItemPosition];
            UpdateRoute(selectedTravelMode);
        }


        private void TravelMode_SelectionChanged(object sender, EventArgs e)
        {
            try
            {
                // Get the selected travel mode.
                TravelMode selectedTravelMode = _availableTravelModes[_travelModeSpinner.SelectedItemPosition];

                // Update the route.
                UpdateRoute(selectedTravelMode);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex);
                ShowMessage("Couldn't change travel mode", "Couldn't change travel mode. See debug output for details.");
            }
        }

        private void ShowMessage(string title, string detail) => new AlertDialog.Builder(this).SetTitle(title).SetMessage(detail).Show();

        private void CreateLayout()
        {
            // Load the layout for the sample from the .axml file.
            SetContentView(Resource.Layout.OfflineRouting);

            // Hook up references to controls.
            _myMapView = FindViewById<MapView>(Resource.Id.OfflineRouting_MyMapView);
            _resetButton = FindViewById<Button>(Resource.Id.OfflineRouting_ResetButton);
            _instructionLabel = FindViewById<TextView>(Resource.Id.OfflineRouting_InstructionLabel);
            _travelModeSpinner = FindViewById<Spinner>(Resource.Id.OfflineRouting_TravelModeSpinner);

            // Set up reset button event.
            _resetButton.Click += ResetButton_Click;

            // Update the label text.
            _instructionLabel.Text = "Tap to add up to 5 stops. The route will display automatically.";
        }
    }
}
Examples

Xamarin Forms Android

Example Name: RouteAroundBarriers

Find a route that reaches all stops without crossing any barriers.

Code example screen shot.

C#
// Copyright 2019 Esri.
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific 
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks.NetworkAnalysis;
using Esri.ArcGISRuntime.UI;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using Xamarin.Forms;
using Color = System.Drawing.Color;

namespace ArcGISRuntimeXamarin.Samples.RouteAroundBarriers
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Route around barriers",
        category: "Network analysis",
        description: "Find a route that reaches all stops without crossing any barriers.",
        instructions: "Tap 'Add stop' to add stops to the route. Tap 'Add barrier' to add areas that can't be crossed by the route. Tap 'Route' to find the route and display it. Select 'Allow stops to be re-ordered' to find the best sequence. Select 'Preserve first stop' if there is a known start point, and 'Preserve last stop' if there is a known final destination.",
        tags: new[] { "barriers", "best sequence", "directions", "maneuver", "network analysis", "routing", "sequence", "stop order", "stops" })]
    public partial class RouteAroundBarriers : ContentPage
    {
        // Track the current state of the sample.
        private SampleState _currentSampleState;

        // Graphics overlays to maintain the stops, barriers, and route result.
        private GraphicsOverlay _routeOverlay;
        private GraphicsOverlay _stopsOverlay;
        private GraphicsOverlay _barriersOverlay;

        // The route task manages routing work.
        private RouteTask _routeTask;

        // The route parameters defines how the route will be calculated.
        private RouteParameters _routeParameters;

        // Symbols for displaying the barriers and the route line.
        private Symbol _routeSymbol;
        private Symbol _barrierSymbol;

        // URL to the network analysis service.
        private const string RouteServiceUrl = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/NetworkAnalysis/SanDiego/NAServer/Route";

        private ContentPage _directionsPage;

        public RouteAroundBarriers()
        {
            InitializeComponent();
            Initialize();
        }

        private async void Initialize()
        {
            try
            {
                // Update interface state.
                UpdateInterfaceState(SampleState.NotReady);

                // Create the map with a basemap.
                Map sampleMap = new Map(Basemap.CreateTopographic());
                sampleMap.InitialViewpoint = new Viewpoint(32.7157, -117.1611, 1e5);
                MyMapView.Map = sampleMap;

                // Create the graphics overlays. These will manage rendering of route, direction, stop, and barrier graphics.
                _routeOverlay = new GraphicsOverlay();
                _stopsOverlay = new GraphicsOverlay();
                _barriersOverlay = new GraphicsOverlay();

                // Add graphics overlays to the map view.
                MyMapView.GraphicsOverlays.Add(_routeOverlay);
                MyMapView.GraphicsOverlays.Add(_stopsOverlay);
                MyMapView.GraphicsOverlays.Add(_barriersOverlay);

                // Create and initialize the route task.
                _routeTask = await RouteTask.CreateAsync(new Uri(RouteServiceUrl));

                // Get the route parameters from the route task.
                _routeParameters = await _routeTask.CreateDefaultParametersAsync();

                // Prepare symbols.
                _routeSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 2);
                _barrierSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Cross, Color.Red, null);

                // Enable the UI.
                UpdateInterfaceState(SampleState.Ready);
            }
            catch (Exception e)
            {
                UpdateInterfaceState(SampleState.NotReady);
                System.Diagnostics.Debug.WriteLine(e);
                ShowMessage("Couldn't load sample", "Couldn't start the sample. See the debug output for detail.");
            }
        }

        private async void HandleMapTap(MapPoint mapLocation)
        {
            // Normalize geometry - important for geometries that will be sent to a server for processing.
            mapLocation = (MapPoint)GeometryEngine.NormalizeCentralMeridian(mapLocation);

            switch (_currentSampleState)
            {
                case SampleState.AddingBarriers:
                    // Buffer the tapped point to create a larger barrier.
                    Geometry bufferedGeometry = GeometryEngine.BufferGeodetic(mapLocation, 500, LinearUnits.Meters);

                    // Create the graphic to show the barrier.
                    Graphic barrierGraphic = new Graphic(bufferedGeometry, _barrierSymbol);

                    // Add the graphic to the overlay - this will cause it to appear on the map.
                    _barriersOverlay.Graphics.Add(barrierGraphic);
                    break;
                case SampleState.AddingStops:
                    // Get the name of this stop.
                    string stopName = $"{_stopsOverlay.Graphics.Count + 1}";

                    // Create the marker to show underneath the stop number.
                    PictureMarkerSymbol pushpinMarker = await GetPictureMarker();

                    // Create the text symbol for showing the stop.
                    TextSymbol stopSymbol = new TextSymbol(stopName, System.Drawing.Color.White, 15,
                        HorizontalAlignment.Center, VerticalAlignment.Middle);
                    stopSymbol.OffsetY = 15;

                    CompositeSymbol combinedSymbol = new CompositeSymbol(new MarkerSymbol[] { pushpinMarker, stopSymbol });

                    // Create the graphic to show the stop.
                    Graphic stopGraphic = new Graphic(mapLocation, combinedSymbol);

                    // Add the graphic to the overlay - this will cause it to appear on the map.
                    _stopsOverlay.Graphics.Add(stopGraphic);
                    break;
            }
        }

        private void ConfigureThenRoute()
        {
            // Guard against error conditions.
            if (_routeParameters == null)
            {
                ShowMessage("Not ready yet", "Sample isn't ready yet; define route parameters first.");
                return;
            }

            if (_stopsOverlay.Graphics.Count < 2)
            {
                ShowMessage("Not enough stops", "Add at least two stops before solving a route.");
                return;
            }

            // Clear any existing route from the map.
            _routeOverlay.Graphics.Clear();

            // Configure the route result to include directions and stops.
            _routeParameters.ReturnStops = true;
            _routeParameters.ReturnDirections = true;

            // Create a list to hold stops that should be on the route.
            List<Stop> routeStops = new List<Stop>();

            // Create stops from the graphics.
            foreach (Graphic stopGraphic in _stopsOverlay.Graphics)
            {
                // Note: this assumes that only points were added to the stops overlay.
                MapPoint stopPoint = (MapPoint)stopGraphic.Geometry;

                // Create the stop from the graphic's geometry.
                Stop routeStop = new Stop(stopPoint);

                // Set the name of the stop to its position in the list.
                routeStop.Name = $"{_stopsOverlay.Graphics.IndexOf(stopGraphic) + 1}";

                // Add the stop to the list of stops.
                routeStops.Add(routeStop);
            }

            // Configure the route parameters with the stops.
            _routeParameters.ClearStops();
            _routeParameters.SetStops(routeStops);

            // Create a list to hold barriers that should be routed around.
            List<PolygonBarrier> routeBarriers = new List<PolygonBarrier>();

            // Create barriers from the graphics.
            foreach (Graphic barrierGraphic in _barriersOverlay.Graphics)
            {
                // Get the polygon from the graphic.
                Polygon barrierPolygon = (Polygon)barrierGraphic.Geometry;

                // Create a barrier from the polygon.
                PolygonBarrier routeBarrier = new PolygonBarrier(barrierPolygon);

                // Add the barrier to the list of barriers.
                routeBarriers.Add(routeBarrier);
            }

            // Configure the route parameters with the barriers.
            _routeParameters.ClearPolygonBarriers();
            _routeParameters.SetPolygonBarriers(routeBarriers);

            // If the user allows stops to be re-ordered, the service will find the optimal order.
            _routeParameters.FindBestSequence = AllowReorderStopsCheckbox.IsToggled;

            // If the user has allowed re-ordering, but has a definite start point, tell the service to preserve the first stop.
            _routeParameters.PreserveFirstStop = PreserveFirstStopCheckbox.IsToggled;

            // If the user has allowed re-ordering, but has a definite end point, tell the service to preserve the last stop.
            _routeParameters.PreserveLastStop = PreserveLastStopCheckbox.IsToggled;

            // Calculate and show the route.
            CalculateAndShowRoute();
        }

        private async void CalculateAndShowRoute()
        {
            try
            {
                // Calculate the route.
                RouteResult calculatedRoute = await _routeTask.SolveRouteAsync(_routeParameters);

                // Get the first returned result.
                Route firstResult = calculatedRoute.Routes.First();

                // Get the route geometry - this is the line that shows the route.
                Polyline calculatedRouteGeometry = firstResult.RouteGeometry;

                // Create the route graphic from the geometry and the symbol.
                Graphic routeGraphic = new Graphic(calculatedRouteGeometry, _routeSymbol);

                // Clear any existing routes, then add this one to the map.
                _routeOverlay.Graphics.Clear();
                _routeOverlay.Graphics.Add(routeGraphic);

                // Add the directions to the textbox.
                PrepareDirectionsList(firstResult.DirectionManeuvers);
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.Write(e);
                ShowMessage("Routing error", $"Couldn't calculate route. See debug output for details. Message: {e.Message}");
            }
        }

        private void PrepareDirectionsList(IReadOnlyList<DirectionManeuver> directions)
        {
            // Create the Xamarin.Forms page for showing the directions.
            _directionsPage = new ContentPage();

            // Create the list view for showing directions.
            ListView directionsList = new ListView();

            // Populate the list view with directions text.
            directionsList.ItemsSource = directions.Select(directionObject => directionObject.DirectionText);

            // Add the list view to the page.
            _directionsPage.Content = directionsList;
        }

        private void MyMapView_OnGeoViewTapped(object sender, Esri.ArcGISRuntime.Xamarin.Forms.GeoViewInputEventArgs e) => HandleMapTap(e.Location);

        private void AddStop_Clicked(object sender, EventArgs e) => UpdateInterfaceState(SampleState.AddingStops);

        private void AddBarrier_Clicked(object sender, EventArgs e) => UpdateInterfaceState(SampleState.AddingBarriers);

        private void ResetRoute_Clicked(object sender, EventArgs e)
        {
            UpdateInterfaceState(SampleState.NotReady);
            _stopsOverlay.Graphics.Clear();
            _barriersOverlay.Graphics.Clear();
            _routeOverlay.Graphics.Clear();
            _directionsPage = null;
            UpdateInterfaceState(SampleState.Ready);
        }

        private void RouteButton_Clicked(object sender, EventArgs e)
        {
            UpdateInterfaceState(SampleState.Routing);
            ConfigureThenRoute();
            UpdateInterfaceState(SampleState.Ready);
        }

        private void ShowDirections_Clicked(object sender, EventArgs e)
        {
            if (_directionsPage != null)
            {
                this.Navigation.PushAsync(_directionsPage);
            }
            else
            {
                ShowMessage("Route not ready", "Add stops and barriers, then select 'Route' to calculate the route before accessing directions.");
            }
        }

        private async Task<PictureMarkerSymbol> GetPictureMarker()
        {
            // Get current assembly that contains the image
            Assembly currentAssembly = Assembly.GetExecutingAssembly();

            // Get image as a stream from the resources
            // Picture is defined as EmbeddedResource and DoNotCopy
            Stream resourceStream = currentAssembly.GetManifestResourceStream(
                "ArcGISRuntime.Resources.PictureMarkerSymbols.pin_blue.png");

            // Create new symbol using asynchronous factory method from stream
            PictureMarkerSymbol pinSymbol = await PictureMarkerSymbol.CreateAsync(resourceStream);
            pinSymbol.Width = 50;
            pinSymbol.Height = 50;
            pinSymbol.LeaderOffsetX = 30;
            pinSymbol.OffsetY = 14;

            return pinSymbol;
        }

        private void UpdateInterfaceState(SampleState newState)
        {
            // Manage the UI state for the sample.
            _currentSampleState = newState;
            switch (_currentSampleState)
            {
                case SampleState.NotReady:
                    AddStopButton.IsEnabled = false;
                    AddBarrierButton.IsEnabled = false;
                    ResetRoutingButton.IsEnabled = false;
                    AllowReorderStopsCheckbox.IsEnabled = false;
                    PreserveFirstStopCheckbox.IsEnabled = false;
                    PreserveLastStopCheckbox.IsEnabled = false;
                    ShowDirectionsButton.IsEnabled = false;
                    CalculateRouteButton.IsEnabled = false;
                    StatusLabel.Text = "Preparing sample...";
                    break;
                case SampleState.AddingBarriers:
                    StatusLabel.Text = "Tap the map to add a barrier.";
                    break;
                case SampleState.AddingStops:
                    StatusLabel.Text = "Tap the map to add a stop.";
                    break;
                case SampleState.Ready:
                    AddStopButton.IsEnabled = true;
                    AddBarrierButton.IsEnabled = true;
                    ResetRoutingButton.IsEnabled = true;
                    AllowReorderStopsCheckbox.IsEnabled = true;
                    PreserveLastStopCheckbox.IsEnabled = true;
                    PreserveFirstStopCheckbox.IsEnabled = true;
                    ShowDirectionsButton.IsEnabled = true;
                    CalculateRouteButton.IsEnabled = true;
                    StatusLabel.Text = "Click 'Add stop' or 'Add barrier', then tap on the map to add stops and barriers.";
                    BusyOverlay.IsVisible = false;
                    break;
                case SampleState.Routing:
                    BusyOverlay.IsVisible = true;
                    break;
            }
        }

        // Enum represents various UI states.
        private enum SampleState
        {
            NotReady,
            Ready,
            AddingStops,
            AddingBarriers,
            Routing
        }

        private async void ShowMessage(string title, string detail)
        {
            await Application.Current.MainPage.DisplayAlert(title, detail, "OK");
        }
    }
}
XAML
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             xmlns:mapping="clr-namespace:Esri.ArcGISRuntime.Mapping;assembly=Esri.ArcGISRuntime"
             xmlns:resources="clr-namespace:Forms.Resources;assembly=ArcGISRuntime"
             x:Class="ArcGISRuntimeXamarin.Samples.RouteAroundBarriers.RouteAroundBarriers">
    <RelativeLayout>
        <esriUI:MapView x:Name="MyMapView" Style="{StaticResource MapWithFormStyle}"
                        BindingContext="{x:Reference Name=ResponsiveFormContainer}"
                        GeoViewTapped="MyMapView_OnGeoViewTapped" 
                        ViewInsets="0,250,0,0"/>
        <resources:ResponsiveFormContainer x:Name="ResponsiveFormContainer">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Label x:Name="StatusLabel"
                           Margin="0,0,0,5"
                           Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3"
                           FontAttributes="Bold"/>
                <Button x:Name="AddStopButton"
                        Text="Add stop"
                        Grid.Row="1" Grid.Column="0"
                        Clicked="AddStop_Clicked" />
                <Button x:Name="AddBarrierButton"
                        Text="Add barrier"
                        Grid.Row="1" Grid.Column="1"
                        Clicked="AddBarrier_Clicked" />
                <Button x:Name="ResetRoutingButton"
                        Text="Reset"
                        Grid.Row="1" Grid.Column="2"
                        Clicked="ResetRoute_Clicked" />
                <StackLayout Orientation="Horizontal"
                             Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="3">
                    <Switch x:Name="AllowReorderStopsCheckbox"
                            VerticalOptions="Center"/>
                    <Label Text="Allow stops to be re-ordered" 
                           VerticalOptions="Center" VerticalTextAlignment="Center" />
                </StackLayout>
                <StackLayout Orientation="Horizontal"
                             Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="3">
                    <Switch x:Name="PreserveFirstStopCheckbox"
                            VerticalOptions="Center" />
                    <Label Text="Preserve first stop"
                           VerticalOptions="Center" VerticalTextAlignment="Center" />
                </StackLayout>
                <StackLayout Orientation="Horizontal"
                             Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="3">
                    <Switch x:Name="PreserveLastStopCheckbox"
                            VerticalOptions="Center" />
                    <Label Text="Preserve last stop"
                           VerticalOptions="Center" VerticalTextAlignment="Center" />
                </StackLayout>
                <Button x:Name="CalculateRouteButton"
                        Text="Route"
                        Grid.Row="5" Grid.Column="0"
                        Clicked="RouteButton_Clicked" />
                <Button x:Name="ShowDirectionsButton"
                        Text="Show directions"
                        Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2"
                        Clicked="ShowDirections_Clicked"/>
                <Grid x:Name="BusyOverlay"
                      Grid.Row="0" Grid.RowSpan="6" Grid.Column="0" Grid.ColumnSpan="3"
                      HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"
                      IsVisible="False"
                      BackgroundColor="#aa000000">
                    <Label Text="Calculating route"
                               HorizontalOptions="Center"
                               VerticalOptions="Center"
                               TextColor="White" />
                </Grid>
            </Grid>
        </resources:ResponsiveFormContainer>
    </RelativeLayout>
</ContentPage>
See Also
Additional Examples
Hyperlink to ExampleDescription
FindRouteDisplay directions for a route between two points.
MobileMapSearchAndRouteDisplay maps and use locators to enable search and routing offline using a Mobile Map Package.
NavigateRouteUse a routing service to navigate between points.
NavigateRouteReroutingNavigate between two points and dynamically recalculate an alternate route when the original route is unavailable.
OfflineRoutingSolve a route on-the-fly using offline data.
RouteAroundBarriersFind a route that reaches all stops without crossing any barriers.