Navigate between two points and dynamically recalculate an alternate route when the original route is unavailable.
Use case
While traveling between destinations, field workers use navigation to get live directions based on their locations. In cases where a field worker makes a wrong turn, or if the route suggested is blocked due to a road closure, it is necessary to calculate an alternate route to the original destination.
How to use the sample
Tap 'Navigate' to simulate traveling and to receive directions from a preset starting point to a preset destination. Observe how the route is recalculated when the simulation does not follow the suggested route. Tap 'Recenter' to refocus on the location display.
How it works
- Create a
RouteTaskusing a URL to an online route service. - Generate default
RouteParametersusingRouteTask.CreateDefaultParametersAsync(). - Set
ReturnStopsandReturnDirectionson the parameters to true. - Add
Stops to the parametersstopscollection for each destination. - Solve the route using
RouteTask.SolveRouteAsync(routeParameters)to get aRouteResult. - Create a
RouteTrackerusing the route result, and the index of the desired route to take. - Enable rerouting in the route tracker with
.EnableReroutingAsync(RouteTask, RouteParameters, ReroutingStrategy, false). The Boolean specifiesvisitFirstStopOnStartand is false by default. UseReroutingStrategy.ToNextWaypointto specify that in the case of a reroute the new route goes from present location to next waypoint or stop. - Use
.TrackLocationAsync(LocationDataSource.Location)to track the location of the device and update the route tracking status. - Add a listener to capture
TrackingStatusChangedEvent, and then get theTrackingStatusand use it to display updated route information. Tracking status includes a variety of information on the route progress, such as the remaining distance, remaining geometry or traversed geometry (represented by aPolyline), or the remaining time (Double), amongst others. - Add a
NewVoiceGuidanceListenerto get theVoiceGuidancewhenever new instructions are available. From the voice guidance, get thestringrepresenting the directions and use a text-to-speech engine to output the maneuver directions. - You can also query the tracking status for the current
DirectionManeuverindex, retrieve that maneuver from theRouteand get its direction text to display in the GUI. - To establish whether the destination has been reached, get the
DestinationStatusfrom the tracking status. If the destination status isReached, and theRemainingDestinationCountis 1, you have arrived at the destination and can stop routing. If there are several destinations in your route, and the remaining destination count is greater than 1, switch the route tracker to the next destination.
Relevant API
- DestinationStatus
- DirectionManeuver
- Location
- LocationDataSource
- ReroutingStrategy
- Route
- RouteParameters
- RouteTask
- RouteTracker
- Stop
- VoiceGuidance
Offline data
A geodatabase contains a road network for San Diego. San Diego Geodatabase
About the data
The route taken in this sample goes from the San Diego Convention Center, site of the annual Esri User Conference, to the Fleet Science Center, San Diego.
Additional information
The route tracker will start a rerouting calculation automatically as necessary when the device's location indicates that it is off-route. The route tracker also validates that the device is "on" the transportation network, if it is not (e.g. in a parking lot) rerouting will not occur until the device location indicates that it is back "on" the transportation network.
Tags
directions, maneuver, navigation, route, turn-by-turn, voice
Sample Code
// Copyright 2022 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 ArcGIS.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Location;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Navigation;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks.NetworkAnalysis;
using Esri.ArcGISRuntime.UI;
using Color = System.Drawing.Color;
using Location = Esri.ArcGISRuntime.Location.Location;
namespace ArcGIS.Samples.NavigateRouteRerouting
{
[ArcGIS.Samples.Shared.Attributes.Sample(
name: "Navigate route with rerouting",
category: "Network analysis",
description: "Navigate between two points and dynamically recalculate an alternate route when the original route is unavailable.",
instructions: "Tap 'Navigate' to simulate traveling and to receive directions from a preset starting point to a preset destination. Observe how the route is recalculated when the simulation does not follow the suggested route. Tap 'Recenter' to refocus on the location display.",
tags: new[] { "directions", "maneuver", "navigation", "route", "turn-by-turn", "voice" })]
[ArcGIS.Samples.Shared.Attributes.OfflineData("567e14f3420d40c5a206e5c0284cf8fc")]
public partial class NavigateRouteRerouting : ContentPage, IDisposable
{
// Variables for tracking the navigation route.
private RouteTracker _tracker;
private RouteResult _routeResult;
private Route _route;
private RouteTask _routeTask;
private RouteParameters _routeParams;
// List of driving directions for the route.
private IReadOnlyList<DirectionManeuver> _directionsList;
// Cancellation token for speech synthesizer.
private CancellationTokenSource _speechToken = new CancellationTokenSource();
// Graphics to show progress along the route.
private Graphic _routeAheadGraphic;
private Graphic _routeTraveledGraphic;
// San Diego Convention Center.
private readonly MapPoint _conventionCenter = new MapPoint(-117.160386727066026, 32.706608204740171, SpatialReferences.Wgs84);
// RH Fleet Aerospace Museum.
private readonly MapPoint _aerospaceMuseum = new MapPoint(-117.146679999797271, 32.730351428946854, SpatialReferences.Wgs84);
// Simulated route to follow.
private readonly string _tourPolylineJSON = "{\"paths\":[[[ -117.160386727066026, 32.706608204740171 ], [ -117.160205336548898, 32.706508733108137 ], [ -117.16002394693011, 32.706409261365152 ], [ -117.159842556412997, 32.706309788755419 ], [ -117.159651667110055, 32.706216667017223 ], [ -117.159454444684357, 32.706127778166461 ], [ -117.159257222258688, 32.706038889227095 ], [ -117.159059999833019, 32.705950000199223 ], [ -117.158902856642044, 32.705835713852132 ], [ -117.158739999267553, 32.705720000231665 ], [ -117.158576363053726, 32.705604545733003 ], [ -117.158417272315205, 32.70549090901352 ], [ -117.158256250198832, 32.705376874547866 ], [ -117.158087499876075, 32.70526125028416 ], [ -117.157918750451643, 32.70514562511471 ], [ -117.1577500001289, 32.705029999795485 ], [ -117.157600000341063, 32.704940000101111 ], [ -117.157425000438906, 32.704823332883613 ], [ -117.157250000536706, 32.704706666269544 ], [ -117.15707875020253, 32.70459250003033 ], [ -117.156909999879787, 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// Path to the network geodatabase for San Diego.
private readonly string _networkGeodatabasePath = DataManager.GetDataFolder("567e14f3420d40c5a206e5c0284cf8fc", "sandiego.geodatabase");
public NavigateRouteRerouting()
{
InitializeComponent();
_ = Initialize();
}
private async Task Initialize()
{
try
{
// Create the map view.
MyMapView.Map = new Map(BasemapStyle.ArcGISStreets);
// Create the route task, using the routing service.
_routeTask = await RouteTask.CreateAsync(_networkGeodatabasePath, "Streets_ND");
// Get the default route parameters.
_routeParams = await _routeTask.CreateDefaultParametersAsync();
// Explicitly set values for parameters.
_routeParams.ReturnDirections = true;
_routeParams.ReturnStops = true;
_routeParams.ReturnRoutes = true;
_routeParams.OutputSpatialReference = SpatialReferences.Wgs84;
// Create stops for each location.
Stop stop1 = new Stop(_conventionCenter) { Name = "San Diego Convention Center" };
Stop stop2 = new Stop(_aerospaceMuseum) { Name = "RH Fleet Aerospace Museum" };
// Assign the stops to the route parameters.
List<Stop> stopPoints = new List<Stop> { stop1, stop2 };
_routeParams.SetStops(stopPoints);
// Get the route results.
_routeResult = await _routeTask.SolveRouteAsync(_routeParams);
_route = _routeResult.Routes[0];
// Add a graphics overlay for the route graphics.
MyMapView.GraphicsOverlays.Add(new GraphicsOverlay());
// Add graphics for the stops.
SimpleMarkerSymbol stopSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.OrangeRed, 20);
MyMapView.GraphicsOverlays[0].Graphics.Add(new Graphic(_conventionCenter, stopSymbol));
MyMapView.GraphicsOverlays[0].Graphics.Add(new Graphic(_aerospaceMuseum, stopSymbol));
// Create a graphic (with a dashed line symbol) to represent the route.
_routeAheadGraphic = new Graphic(_route.RouteGeometry) { Symbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.BlueViolet, 5) };
// Create a graphic (solid) to represent the route that's been traveled (initially empty).
_routeTraveledGraphic = new Graphic { Symbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.LightBlue, 3) };
// Add the route graphics to the map view.
MyMapView.GraphicsOverlays[0].Graphics.Add(_routeAheadGraphic);
MyMapView.GraphicsOverlays[0].Graphics.Add(_routeTraveledGraphic);
// Set the map viewpoint to show the entire route.
await MyMapView.SetViewpointGeometryAsync(_route.RouteGeometry, 100);
// Enable the navigation button.
StartNavigationButton.IsEnabled = true;
}
catch (Exception e)
{
await Application.Current.MainPage.DisplayAlert("Error", e.Message, "OK");
}
}
private async void StartNavigation(object sender, EventArgs e)
{
// Disable the start navigation button.
StartNavigationButton.IsEnabled = false;
// Get the directions for the route.
_directionsList = _route.DirectionManeuvers;
// Create a route tracker.
_tracker = new RouteTracker(_routeResult, 0, true);
_tracker.NewVoiceGuidance += SpeakDirection;
// Handle route tracking status changes.
_tracker.TrackingStatusChanged += TrackingStatusUpdated;
// Check if this route task supports rerouting.
if (_routeTask.RouteTaskInfo.SupportsRerouting)
{
try
{
// Enable automatic re-routing.
await _tracker.EnableReroutingAsync(new ReroutingParameters(_routeTask, _routeParams) { Strategy = ReroutingStrategy.ToNextWaypoint, VisitFirstStopOnStart = false });
// Handle re-routing completion to display updated route graphic and report new status.
_tracker.RerouteStarted += RerouteStarted;
_tracker.RerouteCompleted += RerouteCompleted;
}
catch (Exception ex)
{
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "OK");
}
}
// Turn on navigation mode for the map view.
MyMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Navigation;
MyMapView.LocationDisplay.AutoPanModeChanged += AutoPanModeChanged;
// Add a data source for the location display.
var simulatedSource = new SimulatedLocationDataSource();
simulatedSource.LocationChanged += SimulatedLocationChanged;
// Create SimulationParameters starting at the current time, velocity, and horizontal and vertical accuracy.
SimulationParameters simulationParameters = new SimulationParameters(DateTime.Now, 40.0);
simulatedSource.SetLocationsWithPolyline(Geometry.FromJson(_tourPolylineJSON) as Polyline, simulationParameters);
// Set up the location display.
MyMapView.LocationDisplay.DataSource = new RouteTrackerLocationDataSource(_tracker, simulatedSource);
// Use this instead if you want real location:
// MyMapView.LocationDisplay.DataSource = new RouteTrackerLocationDataSource(_tracker, new SystemLocationDataSource());
// Enable the location display (this will start the location data source).
MyMapView.LocationDisplay.IsEnabled = true;
// Show the message block for text output.
MessagesTextBlock.IsVisible = true;
}
private void SimulatedLocationChanged(object sender, Location e)
{
if (sender is SimulatedLocationDataSource simSource && simSource.CurrentLocationIndex + 1 == simSource.Locations.Count)
{
// Prevent simulated source from looping.
simSource.StopAsync();
}
}
private void RerouteStarted(object sender, EventArgs e)
{
// Remove the event listeners for tracking status changes while the route tracker recalculates.
_tracker.NewVoiceGuidance -= SpeakDirection;
_tracker.TrackingStatusChanged -= TrackingStatusUpdated;
}
private void RerouteCompleted(object sender, RouteTrackerRerouteCompletedEventArgs e)
{
// Get the new directions.
_directionsList = e.TrackingStatus.RouteResult.Routes[0].DirectionManeuvers;
// Re-add the event listeners for tracking status changes.
_tracker.NewVoiceGuidance += SpeakDirection;
_tracker.TrackingStatusChanged += TrackingStatusUpdated;
}
private void TrackingStatusUpdated(object sender, RouteTrackerTrackingStatusChangedEventArgs e)
{
TrackingStatus status = e.TrackingStatus;
// Start building a status message for the UI.
System.Text.StringBuilder statusMessageBuilder = new System.Text.StringBuilder("Route Status:\n");
// Check if navigation is on route.
if (status.IsOnRoute && !status.IsRouteCalculating)
{
// Check the destination status.
if (status.DestinationStatus == DestinationStatus.NotReached || status.DestinationStatus == DestinationStatus.Approaching)
{
statusMessageBuilder.AppendLine("Distance remaining: " +
status.RouteProgress.RemainingDistance.DisplayText + " " +
status.RouteProgress.RemainingDistance.DisplayTextUnits.PluralDisplayName);
statusMessageBuilder.AppendLine("Time remaining: " +
status.RouteProgress.RemainingTime.ToString(@"hh\:mm\:ss"));
if (status.CurrentManeuverIndex + 1 < _directionsList.Count)
{
statusMessageBuilder.AppendLine("Next direction: " + _directionsList[status.CurrentManeuverIndex + 1].DirectionText);
}
// Set geometries for progress and the remaining route.
_routeAheadGraphic.Geometry = status.RouteProgress.RemainingGeometry;
_routeTraveledGraphic.Geometry = status.RouteProgress.TraversedGeometry;
}
else if (status.DestinationStatus == DestinationStatus.Reached)
{
statusMessageBuilder.AppendLine("Destination reached.");
// Set the route geometries to reflect the completed route.
_routeAheadGraphic.Geometry = null;
_routeTraveledGraphic.Geometry = status.RouteResult.Routes[0].RouteGeometry;
}
}
else
{
statusMessageBuilder.AppendLine("Off route!");
}
Microsoft.Maui.ApplicationModel.MainThread.BeginInvokeOnMainThread(() =>
{
// Show the status information in the UI.
MessagesTextBlock.Text = statusMessageBuilder.ToString().TrimEnd('\n').TrimEnd('\r');
});
}
private void SpeakDirection(object sender, RouteTrackerNewVoiceGuidanceEventArgs e)
{
// Say the direction using voice synthesis.
if (e.VoiceGuidance.Text?.Length > 0)
{
_speechToken.Cancel();
_speechToken = new CancellationTokenSource();
TextToSpeech.Default.SpeakAsync(e.VoiceGuidance.Text, null, _speechToken.Token);
}
}
private void AutoPanModeChanged(object sender, LocationDisplayAutoPanMode e)
{
// Turn the recenter button on or off when the location display changes to or from navigation mode.
RecenterButton.IsEnabled = e != LocationDisplayAutoPanMode.Navigation;
}
private void RecenterButton_Click(object sender, EventArgs e)
{
// Change the mapview to use navigation mode.
MyMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Navigation;
}
public void Dispose()
{
// Stop currently playing speech.
_speechToken.Cancel();
// Stop the tracker.
if (_tracker != null)
{
_tracker.TrackingStatusChanged -= TrackingStatusUpdated;
_tracker.NewVoiceGuidance -= SpeakDirection;
_tracker.RerouteStarted -= RerouteStarted;
_tracker.RerouteCompleted -= RerouteCompleted;
_tracker = null;
}
// Stop the location data source.
MyMapView.LocationDisplay?.DataSource?.StopAsync();
}
}
}