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// Copyright 2021 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.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;
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
{
// 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();
// 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
}
}