Display a map from a mobile map package

Learn how to display a map from a mobile map package (MMPK).

In this tutorial you will display a fully interactive map from a mobile map package (MMPK). The map contains a basemap layer and data layers and does not require a network connection.

Prerequisites

Steps

Open a Visual Studio solution

1. To start the tutorial, complete the Display a map tutorial or download and unzip the solution.
2. Open the .sln file in Visual Studio.

Update the tutorial name used in the project (optional)

The Visual Studio solution, project, and the namespace for all classes currently use the name DisplayAMap. Follow the steps below if you prefer the name to reflect the current tutorial. These steps are not required, your code will still work if you keep the original name.

Add a mobile map package to the project

Add a mobile map package (.mmpk) for distribution with your app.

1. Create or download the MahouRivieraTrails.mmpk mobile map package. Complete the Create a mobile map package tutorial to create the package yourself. Otherwise, download the solution file: MahouRivieraTrails.mmpk.

2. From the Visual Studio Project menu, choose Add existing item ....

3. Navigate to the folder that contains your mobile map package. Change the file type in the dialog to All files (*.*), choose MahouRivieraTrails.mmpk, then click Add to add it to the project.

4. In the Visual Studio Solution Explorer, select MahouRivieraTrails.mmpk. In the Properties window, set the following properties of the file.

   • Build Action: Content
   • Copy to Output Directory: Copy always

Open the mobile map package and display a map

Select a map from the maps contained in a mobile map package and display it in a map view. Use the MobileMapPackage class to access the mobile map package and load it to read its contents.

1. In the Visual Studio > Solution Explorer, double-click MapViewModel.cs to open the file.

2. Add additional required using statements at the top of the class.

   MapViewModel.cs

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   using System;
   using System.Collections.Generic;
   using System.Text;
   
   using Esri.ArcGISRuntime.Geometry;
   using Esri.ArcGISRuntime.Mapping;
   using System.ComponentModel;
   using System.Runtime.CompilerServices;
   
   using System.Linq;
   using System.Threading.Tasks;
   

3. In the MapViewModel class, remove all the existing code in the SetupMap() function.

   MapViewModel.cs

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           private void SetupMap()
           {
   
               // Create a new map with a 'topographic vector' basemap.
               Map = new Map(BasemapStyle.ArcGISTopographic);
   
           }
   

4. Modify the signature of the SetupMap() function to include the async keyword and to return Task rather than void.

   MapViewModel.cs

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           private async Task SetupMap()
           {
   
           }
   

   Expand
   More info

   When calling methods asynchronously inside a function (using the await keyword), the async keyword is required in the signature.

   Although a void return type would continue to work, this is not considered best practice. Exceptions thrown by an async void method cannot be caught outside of that method, are difficult to test, and can cause serious side effects if the caller is not expecting them to be asynchronous. The only circumstance where async void is acceptable is when using an event handler, such as a button click.

   See the Microsoft documentation for more information about Asynchronous programming with async and await.

5. (Optional) Modify the call to SetupMap() (in the MapViewModel constructor) to avoid a compilation warning. After changing SetupMap() to an asynchronous method, the following warning appears in the Visual Studio Error List.

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   Because this call is not awaited, execution of the current method continues before the call is
   completed. Consider applying the 'await' operator to the result of the call.

   Because your code does not anticipate a return value from this call, the warning can be ignored. Your code will run despite the warning. But if you want to be more specific about your intentions with this call and to address the warning, add the following code to store the return value in a discard.

   MapViewModel.cs

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           public MapViewModel()
           {
   
               _ = SetupMap();
   
           }
   

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   More info

   From the Microsoft documentation:

   "[Discards] are placeholder variables that are intentionally unused in application code. Discards are equivalent to unassigned variables; they don't have a value. A discard communicates intent to the compiler and others that read your code: You intended to ignore the result of an expression."

6. Add the following code to the SetupMap() function. This code defines the path to the mobile map package relative to the app, creates the mobile map package using the MobileMapPackage constructor, loads the mobile map package asynchronously, and adds the first map in the mobile map package to the MapView .

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               // Define the path to the mobile map package.
               string pathToMobileMapPackage = System.IO.Path.Combine(Environment.CurrentDirectory, @"MahouRivieraTrails.mmpk");
   
               // Instantiate a new mobile map package.
               MobileMapPackage mahouRivieraTrails_MobileMapPackage = new MobileMapPackage(pathToMobileMapPackage);
   
               // Load the mobile map package.
               await mahouRivieraTrails_MobileMapPackage.LoadAsync();
   
               // Show the first map in the mobile map package.
               this.Map = mahouRivieraTrails_MobileMapPackage.Maps.FirstOrDefault();
   

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   More info

   A MobileMapPackage can contain many maps in a Maps array.

   Loading the mobile map package is an asynchronous process, and the Runtime API takes care of reading the file on a thread that will not block the UI.

7. Click Debug > Start Debugging (or press <F5> on the keyboard) to run the app.

You will see a map of trailheads, trails, and parks for the area south of the Santa Monica mountains. You can pinch (to zoom and rotate), drag, and double-tap 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 an offline map (on-demand)