Display a web map

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

display a web map

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

The following are required for this tutorial:

  1. An ArcGIS account to access API keys. If you don't have an account, sign up for free.
  2. A development and deployment environment that meets the system requirements.
  3. An IDE for Android development in Kotlin.

Steps

Open an Android Studio project

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

  2. Modify the old project for use in this new tutorial. Expand More info for instructions.

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

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

Add import statements

  1. Replace app-specific import statements with the imports needed for this tutorial. Copy the imports highlighted in yellow below into your MainActivity.kt.

    MainActivity.kt
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    package com.example.app
    
    import androidx.appcompat.app.AppCompatActivity
    import android.os.Bundle
    import android.util.Log
    import android.widget.Toast
    import androidx.databinding.DataBindingUtil
    import com.arcgismaps.ApiKey
    import com.arcgismaps.ArcGISEnvironment
    import com.arcgismaps.mapping.ArcGISMap
    import com.arcgismaps.mapping.view.MapView
    import com.arcgismaps.portal.Portal
    import com.arcgismaps.mapping.PortalItem
    import com.example.app.databinding.ActivityMainBinding
    
    class MainActivity : AppCompatActivity() {
    

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. Delete the code inside the setupMap method. These lines come from the Display a map tutorial and do not apply here.

    MainActivity.kt
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        private fun setupMap() {
    
            val map = ArcGISMap(BasemapStyle.ArcGISTopographic)
    
            // set the map to be displayed in the layout's MapView
            mapView.map = map
    
            mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 72000.0))
    
        }
    
  2. Create a new Portal referencing ArcGIS Online as the url parameter and Anonymous for the Portal.Connection parameter.

    MainActivity.kt
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        private fun setupMap() {
    
            val portal = Portal("https://www.arcgis.com", Portal.Connection.Anonymous)
    
        }
    
    Expand
  3. Create a PortalItem for the web map, by passing the portal and the web map's item ID as parameters.

  4. Create an ArcGISMap using the item as the constructor parameter.

    MainActivity.kt
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            val portal = Portal("https://www.arcgis.com", Portal.Connection.Anonymous)
    
            val itemId = "41281c51f9de45edaf1c8ed44bb10e30"
            val portalItem = PortalItem(portal, itemId)
            val map = ArcGISMap(portalItem)
    
    Expand
  5. Set the map property of mapView to the ArcGISMap you just created.

    MainActivity.kt
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        private fun setupMap() {
    
            val portal = Portal("https://www.arcgis.com", Portal.Connection.Anonymous)
    
            val itemId = "41281c51f9de45edaf1c8ed44bb10e30"
            val portalItem = PortalItem(portal, itemId)
            val map = ArcGISMap(portalItem)
    
            mapView.map = map
    
        }
    
    Expand
  6. Click Run > Run > app to run the app.

You should see a map of trails, trailheads and parks in the Santa Monica Mountains . Drag, swipe, or pinch 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:

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