Display a web map

Learn how to create and display a map from a web map stored in ArcGIS.

A web map contains the definition of a map, including properties such as the basemap, initial extent, layers, styles, pop-ups, and labels. You can author and save web maps using the Map Viewer or ArcGIS Pro and share them in ArcGIS. Each web map is stored as an item in ArcGIS Online or ArcGIS Enterprise, allowing you to access a web map from a portal using its item ID and display it in your app.

In this tutorial, you use a web map's item ID to display a map of trails, trailheads and parks in the Santa Monica Mountains. The web map is hosted in ArcGIS Online.

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 the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and 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 that they can be used in this tutorial: you will add imports, change the application title, and remove unnecessary code.

1. In the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and click App.

2. Add the following imports above the existing imports:

   App.java

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   import com.esri.arcgisruntime.portal.Portal;
   import com.esri.arcgisruntime.portal.PortalItem;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.view.MapView;
   

3. In the start() lifecycle method, change the title that will appear on the application window to Display a web map tutorial.

   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 web map tutorial");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   

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4. In start(), delete the code for creating a map from a basemap and setting a viewpoint. The web map defines the characteristics of the map, so you don't have to set them in your app.

   App.java

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       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));
   

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Get the web map item ID

You can use ArcGIS tools to create and view web maps. Use the Map Viewer to identify the web map item ID. This item ID will be used later in the tutorial.

1. Go to the LA Trails and Parks web map in the Map Viewer in ArcGIS Online. This web map displays trails, trailheads and parks in the Santa Monica Mountains.
2. Make a note of the item ID at the end of the browser's URL. The item ID should be 41281c51f9de45edaf1c8ed44bb10e30

Display the web map

You can create a map from a web map using the web map's item ID. Use the PortalItem class to access the web map, and the ArcGISMap class to create and display a map from it.

1. In the start() method, create a new Portal referencing ArcGIS Online as the portalUrl parameter and false for the loginRequired parameter.

   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);
   
       Portal portal = new Portal("https://www.arcgis.com", false);
   
   

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2. Create a PortalItem for the web map, by passing the portal and the web map's item ID as parameters.

3. Create an ArcGISMap using the portalItem as the constructor parameter.

   App.java

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       Portal portal = new Portal("https://www.arcgis.com", false);
   
       String itemId = "41281c51f9de45edaf1c8ed44bb10e30";
       PortalItem portalItem = new PortalItem(portal, itemId);
       ArcGISMap map = new ArcGISMap(portalItem);
   

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4. Use the existing code to display the new ArcGISMap on the mapView with setMap().

   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);
   
       Portal portal = new Portal("https://www.arcgis.com", false);
   
       String itemId = "41281c51f9de45edaf1c8ed44bb10e30";
       PortalItem portalItem = new PortalItem(portal, itemId);
       ArcGISMap map = new ArcGISMap(portalItem);
   
       mapView.setMap(map);
   

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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, click run.

You should see a map of trails, trailheads and parks in the Santa Monica Mountains. Click, drag, and scroll the mouse wheel on the map view to explore the map.

What's next?

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

• Display a scene
• Add a feature layer