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
The following are required for this tutorial:
An ArcGIS account to access API keys. If you don't have an account, sign up for free.
A development and deployment environment that meets the system requirements.
An IDE for Android development in Kotlin.
Steps
Open an Android Studio project
To start this tutorial, complete the Display a map tutorial. Or download and unzip the Display a map solution in a new folder.
Modify the old project for use in this new tutorial. Expand More info for instructions.
On your file system, delete the .idea folder, if present, at the top level of your project.
In the Android tool window, open app > res > values > strings.xml.
In the <string name="app_name"> element, change the text content to Display a web map.
strings.xml
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<resources><stringname="app_name">Display a web map</string></resources>
In the Android tool window, open Gradle Scripts > settings.gradle.
Change the value of rootProject.name to Display a web map.
Click File > Sync Project with Gradle files. Android Studio will recognize your changes and create a new .idea folder.
If you downloaded the solution project, set your API key.
An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.
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.
In Android Studio: in the Android tool window, open app > java > com.example.app > MainActivity.
In the setApiKey() function, find the ApiKey.create() call and paste your API key inside the quotes, replacing YOUR_API_KEY.
MainActivity.kt
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privatefunsetApiKey() {
// It is not best practice to store API keys in source code. We have you insert one here// to streamline this tutorial. ArcGISEnvironment.apiKey = ApiKey.create("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.
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.
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 app-specific import statements with the imports needed for this tutorial. Copy the imports highlighted in yellow below into your MainActivity.kt.
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.
Delete the code inside the setupMap method. These lines come from the Display a map tutorial and do not apply here.