Display a web map

Learn how to create and display a from a stored in .

display a web map

A contains the definition of a , including properties such as the , initial , , , , and . You can author and save web maps using the or and share them in . Each web map is stored as an item in or , allowing you to access a from a using its and display it in your app.

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

Prerequisites

Before starting this tutorial, you need the following:

  1. An ArcGIS Location Platform or ArcGIS Online account.

  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.

  3. Get an access token and set the API key in MainActivity.kt.

Get the web map item ID

You can use to create and view . Use the to identify the web map . 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 . 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

Replace the import statements in MainScreen.kt with the imports needed for this tutorial.

MainScreen.kt
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@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.PortalItem
import com.arcgismaps.portal.Portal
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.example.app.R

Display the web map

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

  1. Open the app > kotlin+java > com.example.app > MainActivity.kt. Delete the code inside createMap(). These lines come from the Display a map tutorial and do not apply here.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
    
            initialViewpoint = Viewpoint(
                latitude = 34.0270,
                longitude = -118.8050,
    
                scale = 72000.0
    
            )
    
        }
    
    }
  2. Inside the empty createMap(), create a new Portal referencing as the url parameter and Portal.Connection.Anonymous for the connection parameter.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val portal = Portal(
            url = "https://www.arcgis.com",
            connection = Portal.Connection.Anonymous
        )
    
    }
  3. Next, create a PortalItem for the , by passing the portal and the web map's as parameters.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val portal = Portal(
            url = "https://www.arcgis.com",
            connection = Portal.Connection.Anonymous
        )
    
        val portalItem = PortalItem(
            portal = portal,
            itemId = "41281c51f9de45edaf1c8ed44bb10e30"
        )
    
    }
  4. Last, create an ArcGISMap using portalItem as the constructor parameter.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val portal = Portal(
            url = "https://www.arcgis.com",
            connection = Portal.Connection.Anonymous
        )
    
        val portalItem = PortalItem(
            portal = portal,
            itemId = "41281c51f9de45edaf1c8ed44bb10e30"
        )
    
        return ArcGISMap(portalItem)
    
    }
  5. 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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