Generate offline map with local basemap

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Use the OfflineMapTask to take a web map offline, but instead of downloading an online basemap, use one which is already on the device.

Image of Generate offline map with local basemap

Use case

Reasons to use a basemap which is already on the device, rather than downloading:

You want to limit the total download size.
You want to be able to share a single set of basemap files between many offline maps.
You want to use a custom basemap (for example authored in ArcGIS Pro) which is not available online.
You do not wish to sign into ArcGIS.com in order to download Esri basemaps.

The author of a web map can support the use of basemaps which are already on a device by configuring the web map to specify the name of a suitable basemap file. This could be a basemap which:

Has been authored in ArcGIS Pro to make use of your organizations custom data.
Is available as a PortalItem which can be downloaded once and re-used many times.

How to use the sample

Use the button to start taking the map offline.
Specify whether to download the basemap or use a basemap already taken offline.
If you choose to download the online basemap, the offline map will be generated with the same (topographic) basemap as the online web map.
To download the Esri basemap, you may be prompted to sign in to ArcGIS.com.
If you choose to use the basemap from the device, the offline map will be generated with the local imagery basemap. The download will be quicker since no tiles are exported or downloaded.
Since the application is not exporting online ArcGIS Online basemaps you will not need to log-in.

How it works

The sample creates a PortalItem object using a web map's ID. This portal item is used to initialize an OfflineMapTask object. When the button is clicked, the sample requests the default parameters for the task, with the selected extent, by calling OfflineMapTask.CreateDefaultGenerateOfflineMapParameters.

Once the parameters are created, the application checks the GenerateOfflineMapParameters.ReferenceBasemapFilename property. The author of an online web map can configure this setting to indicate the name of a suitable basemap. In this example, the application checks the local file-system for the suggested "naperville_imagery.tpkx".

If the user chooses to use the basemap on the device, the GenerateOfflineMapParameters.ReferenceBasemapDirectory is set to the absolute path of the directory which contains the .tpkx file.

A GenerateOfflineMapJob is created by calling OfflineMapTask.GenerateOfflineMap passing the parameters and the download location for the offline map.

When the GenerateOfflineMapJob is started it will check whether GenerateOfflineMapParameters.ReferenceBasemapDirectory has been set. If this property is set, no online basemap will be downloaded and instead, the mobile map will be created with a reference to the .tpkx on the device.

Relevant API

OfflineMapTask
GenerateOfflineMapParameters
GenerateOfflineMapJob
GenerateOfflineMapResult

Offline data

This sample uses naperville_imagery.tpkx. It is downloaded from ArcGIS Online automatically before the sample runs.

Sample Code

OfflineBasemapByReference.cs
﻿// Copyright 2019 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using ArcGISRuntime;
using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Portal;
using Esri.ArcGISRuntime.Security;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks;
using Esri.ArcGISRuntime.Tasks.Offline;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UIKit;
using Xamarin.Auth;

namespace ArcGISRuntimeXamarin.Samples.OfflineBasemapByReference
{
    [Register("OfflineBasemapByReference")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Generate offline map with local basemap",
        category: "Map",
        description: "Use the `OfflineMapTask` to take a web map offline, but instead of downloading an online basemap, use one which is already on the device.",
        instructions: "1. Use the button to start taking the map offline.",
        tags: new[] { "basemap", "download", "local", "offline", "save", "web map" })]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("85282f2aaa2844d8935cdb8722e22a93")]
    public class OfflineBasemapByReference : UIViewController, IOAuthAuthorizeHandler
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UIActivityIndicatorView _loadingIndicator;
        private UIBarButtonItem _takeMapOfflineButton;
        private UILabel _statusLabel;

        // The job to generate an offline map.
        private GenerateOfflineMapJob _generateOfflineMapJob;

        // The extent of the data to take offline.
        private readonly Envelope _areaOfInterest = new Envelope(-88.1541, 41.7690, -88.1471, 41.7720, SpatialReferences.Wgs84);

        // The ID for a web map item hosted on the server (water network map of Naperville IL).
        private const string WebMapId = "acc027394bc84c2fb04d1ed317aac674";

        public OfflineBasemapByReference()
        {
            Title = "Generate offline map with local basemap";
        }

        private void ConfigureOfflineJobForBasemap(GenerateOfflineMapParameters parameters, Action completionAction)
        {
            // Don't give the user a choice if there is no basemap specified.
            if (String.IsNullOrWhiteSpace(parameters.ReferenceBasemapFilename))
            {
                return;
            }

            // Get the path to the basemap directory.
            string basemapBasePath = DataManager.GetDataFolder("85282f2aaa2844d8935cdb8722e22a93");

            // Get the full path to the basemap by combining the name specified in the web map (ReferenceBasemapFilename)
            //  with the offline basemap directory.
            string basemapFullPath = Path.Combine(basemapBasePath, parameters.ReferenceBasemapFilename);

            // If the offline basemap doesn't exist, proceed without it.
            if (!File.Exists(basemapFullPath))
            {
                return;
            }

            UIAlertController basemapAlert = UIAlertController.Create("Basemap choice", "Use the offline basemap?", UIAlertControllerStyle.Alert);

            // Configure the directory and move on when the user says 'yes'.
            basemapAlert.AddAction(UIAlertAction.Create("Yes", UIAlertActionStyle.Default,
                uiAlertAction =>
                {
                    parameters.ReferenceBasemapDirectory = basemapBasePath;
                    completionAction.Invoke();
                }));

            // Do nothing and move on if the user says no.
            basemapAlert.AddAction(UIAlertAction.Create("No", UIAlertActionStyle.Cancel, action => completionAction.Invoke()));

            // Show the alert.
            PresentViewController(basemapAlert, true, null);
        }

        // Note: all code below (except call to ConfigureOfflineJobForBasemap) is identical to code in the Generate offline map sample.

        #region Generate offline map

        private async void Initialize()
        {
            try
            {
                // Start the loading indicator.
                _loadingIndicator.StartAnimating();

                // Call a function to set up the AuthenticationManager for OAuth.
                SetOAuthInfo();

                // Create the ArcGIS Online portal.
                ArcGISPortal portal = await ArcGISPortal.CreateAsync();

                // Get the Naperville water web map item using its ID.
                PortalItem webmapItem = await PortalItem.CreateAsync(portal, WebMapId);

                // Create a map from the web map item.
                Map onlineMap = new Map(webmapItem);

                // Display the map in the MapView.
                _myMapView.Map = onlineMap;

                // Disable user interactions on the map (no panning or zooming from the initial extent).
                _myMapView.InteractionOptions = new MapViewInteractionOptions
                {
                    IsEnabled = false
                };

                // Create a graphics overlay for the extent graphic and apply a renderer.
                SimpleLineSymbol aoiOutlineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.Red, 3);
                GraphicsOverlay extentOverlay = new GraphicsOverlay
                {
                    Renderer = new SimpleRenderer(aoiOutlineSymbol)
                };
                _myMapView.GraphicsOverlays.Add(extentOverlay);

                // Add a graphic to show the area of interest (extent) that will be taken offline.
                Graphic aoiGraphic = new Graphic(_areaOfInterest);
                extentOverlay.Graphics.Add(aoiGraphic);

                // Hide the map loading progress indicator.
                _loadingIndicator.StopAnimating();
            }
            catch (Exception ex)
            {
                // Show the exception message to the user.
                UIAlertController messageAlert = UIAlertController.Create("Error", ex.Message, UIAlertControllerStyle.Alert);
                messageAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                PresentViewController(messageAlert, true, null);
            }
        }

        private async void TakeMapOfflineButton_Click(object sender, EventArgs e)
        {
            // Show the loading indicator.
            _loadingIndicator.StartAnimating();

            // Create a path for the output mobile map.
            string tempPath = $"{Path.GetTempPath()}";
            string[] outputFolders = Directory.GetDirectories(tempPath, "NapervilleWaterNetwork*");

            // Loop through the folder names and delete them.
            foreach (string dir in outputFolders)
            {
                try
                {
                    // Delete the folder.
                    Directory.Delete(dir, true);
                }
                catch (Exception)
                {
                    // Ignore exceptions (files might be locked, for example).
                }
            }

            // Create a new folder for the output mobile map.
            string packagePath = Path.Combine(tempPath, @"NapervilleWaterNetwork");
            int num = 1;
            while (Directory.Exists(packagePath))
            {
                packagePath = Path.Combine(tempPath, @"NapervilleWaterNetwork" + num);
                num++;
            }

            // Create the output directory.
            Directory.CreateDirectory(packagePath);

            // Show the loading overlay while the job is running.
            _statusLabel.Text = "Taking map offline...";

            // Create an offline map task with the current (online) map.
            OfflineMapTask takeMapOfflineTask = await OfflineMapTask.CreateAsync(_myMapView.Map);

            // Create the default parameters for the task, pass in the area of interest.
            GenerateOfflineMapParameters parameters = await takeMapOfflineTask.CreateDefaultGenerateOfflineMapParametersAsync(_areaOfInterest);

            // Configure basemap settings for the job.
            ConfigureOfflineJobForBasemap(parameters, async () =>
            {
                try
                {
                    // Create the job with the parameters and output location.
                    _generateOfflineMapJob = takeMapOfflineTask.GenerateOfflineMap(parameters, packagePath);

                    // Handle the progress changed event for the job.
                    _generateOfflineMapJob.ProgressChanged += OfflineMapJob_ProgressChanged;

                    // Await the job to generate geodatabases, export tile packages, and create the mobile map package.
                    GenerateOfflineMapResult results = await _generateOfflineMapJob.GetResultAsync();

                    // Check for job failure (writing the output was denied, e.g.).
                    if (_generateOfflineMapJob.Status != JobStatus.Succeeded)
                    {
                        // Report failure to the user.
                        UIAlertController messageAlert = UIAlertController.Create("Error", "Failed to take the map offline.", UIAlertControllerStyle.Alert);
                        messageAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                        PresentViewController(messageAlert, true, null);
                    }

                    // Check for errors with individual layers.
                    if (results.LayerErrors.Any())
                    {
                        // Build a string to show all layer errors.
                        StringBuilder errorBuilder = new StringBuilder();
                        foreach (KeyValuePair<Layer, Exception> layerError in results.LayerErrors)
                        {
                            errorBuilder.AppendLine($"{layerError.Key.Id} : {layerError.Value.Message}");
                        }

                        // Show layer errors.
                        UIAlertController messageAlert = UIAlertController.Create("Error", errorBuilder.ToString(), UIAlertControllerStyle.Alert);
                        messageAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                        PresentViewController(messageAlert, true, null);
                    }

                    // Display the offline map.
                    _myMapView.Map = results.OfflineMap;

                    // Apply the original viewpoint for the offline map.
                    _myMapView.SetViewpoint(new Viewpoint(_areaOfInterest));

                    // Enable map interaction so the user can explore the offline data.
                    _myMapView.InteractionOptions.IsEnabled = true;

                    // Change the title and disable the "Take map offline" button.
                    _statusLabel.Text = "Map is offline";
                    _takeMapOfflineButton.Enabled = false;
                }
                catch (TaskCanceledException)
                {
                    // Generate offline map task was canceled.
                    UIAlertController messageAlert = UIAlertController.Create("Canceled", "Taking map offline was canceled", UIAlertControllerStyle.Alert);
                    messageAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                    PresentViewController(messageAlert, true, null);
                }
                catch (Exception ex)
                {
                    // Exception while taking the map offline.
                    UIAlertController messageAlert = UIAlertController.Create("Error", ex.Message, UIAlertControllerStyle.Alert);
                    messageAlert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                    PresentViewController(messageAlert, true, null);
                }
                finally
                {
                    // Hide the loading overlay when the job is done.
                    _loadingIndicator.StopAnimating();
                }
            });
        }

        // Show changes in job progress.
        private void OfflineMapJob_ProgressChanged(object sender, EventArgs e)
        {
            // Get the job.
            GenerateOfflineMapJob job = sender as GenerateOfflineMapJob;

            // Dispatch to the UI thread.
            InvokeOnMainThread(() =>
            {
                // Show the percent complete and update the progress bar.
                _statusLabel.Text = $"Taking map offline ({job.Progress}%) ...";
            });
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView {BackgroundColor = ApplicationTheme.BackgroundColor};

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            _takeMapOfflineButton = new UIBarButtonItem("Generate offline map", UIBarButtonItemStyle.Plain, TakeMapOfflineButton_Click);

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;
            toolbar.Items = new[]
            {
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
                _takeMapOfflineButton,
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace)
            };

            _statusLabel = new UILabel
            {
                Text = "Use the button to take the map offline.",
                AdjustsFontSizeToFitWidth = true,
                TextAlignment = UITextAlignment.Center,
                BackgroundColor = UIColor.FromWhiteAlpha(0, .6f),
                TextColor = UIColor.White,
                Lines = 1,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            _loadingIndicator = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.WhiteLarge);
            _loadingIndicator.TranslatesAutoresizingMaskIntoConstraints = false;
            _loadingIndicator.BackgroundColor = UIColor.FromWhiteAlpha(0, .6f);

            // Add the views.
            View.AddSubviews(_myMapView, toolbar, _loadingIndicator, _statusLabel);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(toolbar.TopAnchor),

                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor),

                _statusLabel.TopAnchor.ConstraintEqualTo(_myMapView.TopAnchor),
                _statusLabel.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _statusLabel.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _statusLabel.HeightAnchor.ConstraintEqualTo(40),

                _loadingIndicator.TopAnchor.ConstraintEqualTo(_statusLabel.BottomAnchor),
                _loadingIndicator.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _loadingIndicator.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _loadingIndicator.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }

        #endregion Generate offline map

        #region Authentication

        // Constants for OAuth-related values.
        // - The URL of the portal to authenticate with (ArcGIS Online).
        private const string ServerUrl = "https://www.arcgis.com/sharing/rest";

        // - The Client ID for an app registered with the server (the ID below is for a public app created by the ArcGIS Runtime team).
        private const string AppClientId = @"IBkBd7YYFHOzPIIO";

        // - A URL for redirecting after a successful authorization (this must be a URL configured with the app).
        private const string OAuthRedirectUrl = @"xamarin-ios-app://auth";

        private void SetOAuthInfo()
        {
            // Register the server information with the AuthenticationManager.
            ServerInfo serverInfo = new ServerInfo(new Uri(ServerUrl))
            {
                TokenAuthenticationType = TokenAuthenticationType.OAuthImplicit,
                OAuthClientInfo = new OAuthClientInfo(AppClientId, new Uri(OAuthRedirectUrl))
            };

            // Register this server with AuthenticationManager.
            AuthenticationManager.Current.RegisterServer(serverInfo);

            // Use a function in this class to challenge for credentials.
            AuthenticationManager.Current.ChallengeHandler = new ChallengeHandler(CreateCredentialAsync);

            // Set the OAuthAuthorizeHandler component (this class) for Android or iOS platforms.
            AuthenticationManager.Current.OAuthAuthorizeHandler = this;
        }

        // ChallengeHandler function that will be called whenever access to a secured resource is attempted.
        private async Task<Credential> CreateCredentialAsync(CredentialRequestInfo info)
        {
            Credential credential = null;

            try
            {
                // IOAuthAuthorizeHandler will challenge the user for OAuth credentials.
                credential = await AuthenticationManager.Current.GenerateCredentialAsync(info.ServiceUri);
            }
            catch (TaskCanceledException)
            {
                return credential;
            }
            catch (Exception)
            {
                // Exception will be reported in calling function.
                throw;
            }

            return credential;
        }

        #region IOAuthAuthorizationHandler implementation

        // Use a TaskCompletionSource to track the completion of the authorization.
        private TaskCompletionSource<IDictionary<string, string>> _taskCompletionSource;

        // IOAuthAuthorizeHandler.AuthorizeAsync implementation.
        public Task<IDictionary<string, string>> AuthorizeAsync(Uri serviceUri, Uri authorizeUri, Uri callbackUri)
        {
            // If the TaskCompletionSource is not null, authorization may already be in progress and should be canceled.
            // Try to cancel any existing authentication task.
            _taskCompletionSource?.TrySetCanceled();

            // Create a task completion source.
            _taskCompletionSource = new TaskCompletionSource<IDictionary<string, string>>();

            // Get the current iOS ViewController.
            UIViewController viewController = null;
            InvokeOnMainThread(() => { viewController = UIApplication.SharedApplication.KeyWindow.RootViewController; });

            // Create a new Xamarin.Auth.OAuth2Authenticator using the information passed in.
            OAuth2Authenticator authenticator = new OAuth2Authenticator(
                clientId: AppClientId,
                scope: "",
                authorizeUrl: authorizeUri,
                redirectUrl: callbackUri)
            {
                ShowErrors = false,
                // Allow the user to cancel the OAuth attempt.
                AllowCancel = true
            };

            // Define a handler for the OAuth2Authenticator.Completed event.
            authenticator.Completed += (sender, authArgs) =>
            {
                try
                {
                    // Dismiss the OAuth UI when complete.
                    viewController.DismissViewController(true, null);

                    // Check if the user is authenticated.
                    if (authArgs.IsAuthenticated)
                    {
                        // If authorization was successful, get the user's account.
                        Xamarin.Auth.Account authenticatedAccount = authArgs.Account;

                        // Set the result (Credential) for the TaskCompletionSource.
                        _taskCompletionSource.SetResult(authenticatedAccount.Properties);
                    }
                    else
                    {
                        throw new Exception("Unable to authenticate user.");
                    }
                }
                catch (Exception ex)
                {
                    // If authentication failed, set the exception on the TaskCompletionSource.
                    _taskCompletionSource.TrySetException(ex);

                    // Cancel authentication.
                    authenticator.OnCancelled();
                }
            };

            // If an error was encountered when authenticating, set the exception on the TaskCompletionSource.
            authenticator.Error += (sndr, errArgs) =>
            {
                // If the user cancels, the Error event is raised but there is no exception ... best to check first.
                if (errArgs.Exception != null)
                {
                    _taskCompletionSource.TrySetException(errArgs.Exception);
                }
                else
                {
                    // Login canceled: dismiss the OAuth login.
                    _taskCompletionSource?.TrySetCanceled();
                }

                // Cancel authentication.
                authenticator.OnCancelled();
            };


            // Present the OAuth UI (on the app's UI thread) so the user can enter user name and password.
            InvokeOnMainThread(() => { viewController.PresentViewController(authenticator.GetUI(), true, null); });

            // Return completion source task so the caller can await completion.
            return _taskCompletionSource.Task;
        }

        #endregion
    }

    #endregion
}

DocumentationArcGIS Runtime API for .NETiOS samples

Generate offline map with local basemap

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DocumentationArcGIS Runtime API for .NETiOS samples

Generate offline map with local basemap

Use case

How to use the sample

How it works

Relevant API

Offline data

Tags

Sample Code

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