Open map URL

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Display a web map.

Image of open map URL

Use case

For displaying web maps stored on ArcGISOnline (e.g. soil survey results, as demonstrated in this sample).

How to use the sample

A web map can be selected from the drop-down list. On selection the web map displays in the map view.

How it works

  1. Create a Portal from the ArcGIS URL http://www.arcgis.com.
  2. Create a PortalItem using the Portal and the web map ID: new PortalItem(portal, ID).
  3. Create a Map using the portal item.
  4. Set the map to the MapView.

Relevant API

  • Map
  • MapView
  • Portal
  • PortalItem

Additional information

Mobile map packages can also include address locators and geometric networks. For an example of this, see the "Mobile Map Search and Route Sample".

Tags

portal item, web map

Sample Code

OpenMapURL.cs
                                                                                                                                     
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// Copyright 2016 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 System;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.OpenMapURL
{
    [Register("OpenMapURL")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Open map URL",
        category: "Map",
        description: "Display a web map.",
        instructions: "A web map can be selected from the drop-down list. On selection the web map displays in the map view.",
        tags: new[] { "portal item", "web map" })]
    public class OpenMapURL : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UIBarButtonItem _selectMapButton;

        // String array to hold URLs to publicly available web maps.
        private readonly string[] _itemUrLs =
        {
            "https://www.arcgis.com/home/item.html?id=6c55717376ff4faaa18ea75e0388e4b2",
            "https://www.arcgis.com/home/item.html?id=01f052c8995e4b9e889d73c3e210ebe3",
            "https://www.arcgis.com/home/item.html?id=92ad152b9da94dee89b9e387dfe21acd"
        };

        // String array to store titles for the webmaps specified above. These titles are in the same order as the URLs above.
        private readonly string[] _titles =
        {
            "Kilauea volcanic eruption",
            "USA Tapestry Segmentation",
            "Geology of the United States"
        };

        public OpenMapURL()
        {
            Title = "Open map (URL)";
        }

        private void Initialize()
        {
            // Show the first webmap by default.
            _myMapView.Map = new Map(new Uri(_itemUrLs[0]));
        }

        private void OnMapsButtonTouch(object sender, EventArgs e)
        {
            // Initialize an UIAlertController with a title and style of an alert.
            UIAlertController actionSheetAlert = UIAlertController.Create("Select a map to open", "", UIAlertControllerStyle.Alert);

            // Add actions to alert. Selecting an option re-initializes the Map
            // with selected webmap URL and assigns it to MapView.
            actionSheetAlert.AddAction(UIAlertAction.Create(_titles[0], UIAlertActionStyle.Default,
                action => _myMapView.Map = new Map(new Uri(_itemUrLs[0]))));
            actionSheetAlert.AddAction(UIAlertAction.Create(_titles[1], UIAlertActionStyle.Default,
                action => _myMapView.Map = new Map(new Uri(_itemUrLs[1]))));
            actionSheetAlert.AddAction(UIAlertAction.Create(_titles[2], UIAlertActionStyle.Default,
                action => _myMapView.Map = new Map(new Uri(_itemUrLs[2]))));
            PresentViewController(actionSheetAlert, true, null);
        }

        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;

            _selectMapButton = new UIBarButtonItem();
            _selectMapButton.Title = "Select a map";

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

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

            // 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.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor),
                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _selectMapButton.Clicked += OnMapsButtonTouch;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _selectMapButton.Clicked -= OnMapsButtonTouch;
        }
    }
}

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