Display device location

Learn how to display the current device location on a map or scene.

You can display the device location on a map or scene. This is important for workflows that require the user's current location, such as finding nearby businesses, navigating from the current location, or identifying and collecting geospatial information.

By default, location display uses the device's location provider. Your app can also process input from other location providers, such as an external GPS receiver or a provider that returns a simulated location. For more information, see the Show device location topic.

Prerequisites

Steps

Open a Java project with Gradle

1. To start this tutorial, complete the Display a map tutorial, or download and unzip the Display a map solution into a new folder.

2. Open the build.gradle file as a project in IntelliJ IDEA.

3. If you downloaded the solution project, set your API key.

   More info

   An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

   1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

   2. In IntelliJ IDEA's Project tool window, open src/main/java/com.example.app and double-click App.

   3. In the start() method, set the API key property on the ArcGISRuntimeEnvironment with your API key. Replace YOUR_API_KEY with your actual API Key. Be sure to surround your API Key with quotes, because the parameter passed to setApiKey is a string.

   App.java

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     @Override
     public void start(Stage stage) {
       // set the title and size of the stage and show it
       stage.setTitle("Display a map tutorial");
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEY";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   

Prepare files before coding the app

Modify the files from the Display a map tutorial so they can be used in this tutorial: you will add imports, change the application title, and remove unnecessary code; you will then add a requirement to the Java module definition and a dependency to the build configuration.

1. In IntelliJ IDEA's Project tool window, open src/main/java/com.example.app and double-click App. Add the following imports, replacing those from the Display a map tutorial

   App.java

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   package com.example.app;
   
   import java.nio.charset.StandardCharsets;
   import java.util.Calendar;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.control.Alert;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.geometry.Geometry;
   import com.esri.arcgisruntime.geometry.Polyline;
   import com.esri.arcgisruntime.geometry.SpatialReferences;
   import com.esri.arcgisruntime.loadable.LoadStatus;
   import com.esri.arcgisruntime.location.SimulatedLocationDataSource;
   import com.esri.arcgisruntime.location.SimulationParameters;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.view.LocationDisplay;
   import com.esri.arcgisruntime.mapping.view.MapView;
   
   import org.apache.commons.io.IOUtils;
   
   
   public class App extends Application {
   

2. In the start() life-cycle method, change the title that will appear on the application window to Display device location.

   App.java

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     @Override
     public void start(Stage stage) {
   
       try {
   
         // set the title and size of the stage and show it
         stage.setTitle("Display device location");
   
         stage.setWidth(800);
         stage.setHeight(700);
         stage.show();
   

3. Delete the map's initial viewpoint. The map will zoom to the extent of the current location, so this code is no longer needed.

   App.java

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       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
   

4. In IntelliJ IDEA's Project tool window, double-click module-info.java. Add one requires module directive.

   module-info.java

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   module com.example.app {
     // require ArcGIS Runtime module
     requires com.esri.arcgisruntime;
   
     // requires JavaFX modules that the application uses
     requires javafx.graphics;
   
     // requires SLF4j module
     requires org.slf4j.nop;
   
   
     requires org.apache.commons.io;
   
   
     exports com.example.app;
   }

5. In IntelliJ IDEA's Project tool window, double-click build.gradle. Add one dependency and load the gradle changes.

   build.gradle

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   dependencies {
   
       implementation 'commons-io:commons-io:2.11.0'
   
       implementation "com.esri.arcgisruntime:arcgis-java:$arcgisVersion"
       natives "com.esri.arcgisruntime:arcgis-java-jnilibs:$arcgisVersion"
       natives "com.esri.arcgisruntime:arcgis-java-resources:$arcgisVersion"
       implementation "org.slf4j:slf4j-nop:2.0.7"
   }
   

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Create simulated location data

Simulation of location data allows this app to run on devices that do not have location services or do not have an actively updating GPS signal. Simulated data is also useful for testing your own location-enabled apps. For more information, see Simulated device location updates.

For this tutorial, you will use simulated location data: a set of location points defined in json. The location points are from a walk around a large parking lot. To display a user's real position, you would use NmeaLocationDataSource instead.

1. On your file system, create a file named polyline_data.json in the src/main/resources/ directory of your project. Then paste the following json code into it.

   polyline_data.json

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   {
     "paths": [
       [
         [-117.19810659418077, 34.057405229888325],
         [-117.19814377275544, 34.057211176001729],
         [-117.19775710911107, 34.057177293200773],
         [-117.1973868388223, 34.057255151357538],
         [-117.19724927620958, 34.057458446284997],
         [-117.1973853161779, 34.057553079922293],
         [-117.19752637683034, 34.057534135490592],
         [-117.19771293355865, 34.057471254533809],
         [-117.19794672280628, 34.057485315324428],
         [-117.19810659418077, 34.057405229888325]
       ]
     ],
     "spatialReference": {
       "wkid": 102100,
       "latestWkid": 3857
     }
   }

2. From those location points, create a Polyline that traces the route through the parking lot.

   In App.java, get the data from the json file, using IOUtils.string(), which you imported from the commons-io dependency in the previous section. Then call Geometry.fromJson() and cast the returned Geometry to a Polyline.

   App.java

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         // access the json of the location points
         String polylineData = IOUtils.toString(getClass().getResourceAsStream(
                 "/polyline_data.json"), StandardCharsets.UTF_8);
   
         // create a polyline from the location points
         Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
   
   

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3. Create a SimulatedLocationDataSource and set the location data points on it, and then pass the polyline describing the route and the SimulationParameters to SimulateLocationDataSource.setLocations().

   App.java

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         // access the json of the location points
         String polylineData = IOUtils.toString(getClass().getResourceAsStream(
                 "/polyline_data.json"), StandardCharsets.UTF_8);
   
         // create a polyline from the location points
         Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
   
         // create a simulated location data source
         SimulatedLocationDataSource simulatedLocationDataSource = new SimulatedLocationDataSource();
         // set the location of the simulated location data source with simulation parameters to set a consistent velocity
         simulatedLocationDataSource.setLocations(
                 locations, new SimulationParameters(Calendar.getInstance(), 5.0, 0.0, 0.0));
   
   

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Show the current location

Each map view has its own instance of a LocationDisplay that shows the current location (point) of the device. This is displayed as an overlay in the map view.

1. In start(), get the location display and set the simulated location data source on it.

   App.java

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         // access the json of the location points
         String polylineData = IOUtils.toString(getClass().getResourceAsStream(
                 "/polyline_data.json"), StandardCharsets.UTF_8);
   
         // create a polyline from the location points
         Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
   
         // create a simulated location data source
         SimulatedLocationDataSource simulatedLocationDataSource = new SimulatedLocationDataSource();
         // set the location of the simulated location data source with simulation parameters to set a consistent velocity
         simulatedLocationDataSource.setLocations(
                 locations, new SimulationParameters(Calendar.getInstance(), 5.0, 0.0, 0.0));
   
         // configure the map view's location display to follow the simulated location data source
         LocationDisplay locationDisplay = mapView.getLocationDisplay();
         locationDisplay.setLocationDataSource(simulatedLocationDataSource);
   
   

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2. Set the autopan mode to recenter. (For other autopan modes, see the LocationDisplay.AutoPanMode enum.) Then set the initial zoom scale to 1000, using LocationDisplay.setInitialZoomScale().

   App.java

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         // access the json of the location points
         String polylineData = IOUtils.toString(getClass().getResourceAsStream(
                 "/polyline_data.json"), StandardCharsets.UTF_8);
   
         // create a polyline from the location points
         Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
   
         // create a simulated location data source
         SimulatedLocationDataSource simulatedLocationDataSource = new SimulatedLocationDataSource();
         // set the location of the simulated location data source with simulation parameters to set a consistent velocity
         simulatedLocationDataSource.setLocations(
                 locations, new SimulationParameters(Calendar.getInstance(), 5.0, 0.0, 0.0));
   
         // configure the map view's location display to follow the simulated location data source
         LocationDisplay locationDisplay = mapView.getLocationDisplay();
         locationDisplay.setLocationDataSource(simulatedLocationDataSource);
   
         locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
         locationDisplay.setInitialZoomScale(1000);
   
   

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3. Once the map has loaded, start the location display.

   App.java

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   Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.

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         // access the json of the location points
         String polylineData = IOUtils.toString(getClass().getResourceAsStream(
                 "/polyline_data.json"), StandardCharsets.UTF_8);
   
         // create a polyline from the location points
         Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
   
         // create a simulated location data source
         SimulatedLocationDataSource simulatedLocationDataSource = new SimulatedLocationDataSource();
         // set the location of the simulated location data source with simulation parameters to set a consistent velocity
         simulatedLocationDataSource.setLocations(
                 locations, new SimulationParameters(Calendar.getInstance(), 5.0, 0.0, 0.0));
   
         // configure the map view's location display to follow the simulated location data source
         LocationDisplay locationDisplay = mapView.getLocationDisplay();
         locationDisplay.setLocationDataSource(simulatedLocationDataSource);
   
         locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
         locationDisplay.setInitialZoomScale(1000);
   
         map.addDoneLoadingListener(() -> {
           if (map.getLoadStatus() == LoadStatus.LOADED) {
   
             // start the location display
             locationDisplay.startAsync();
   
           } else {
             new Alert(Alert.AlertType.ERROR, "Map failed to load: " + map.getLoadError().getCause().getMessage()).show();
           }
         });
   

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4. Wrap your code in start() with try and catch blocks.

   App.java

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   Add line.

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     @Override
     public void start(Stage stage) {
   
       try {
   
         // set the title and size of the stage and show it
         stage.setTitle("Display device location");
   
         stage.setWidth(800);
         stage.setHeight(700);
         stage.show();
   

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5. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, double-click run.

You will see the initial location displayed as a round blue symbol on the map. The location symbol then changes into a white arrowhead within a blue circle and begins walking around the parking lot as the location display consumes the simulated data. When the end of the data is reached, the route repeats.

Different location symbols are used in different autopan modes, and a location symbol's appearance changes whenever a location is acquired. See LocationDisplay.AutoPanMode for details.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

• Search for an address
• Find a route and directions