Open map URL

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Display a web map.

Image of open map URL

Use case

For displaying web maps stored on ArcGIS Online.

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

About the data

The web maps accessed by this sample show Geology for United States, Terrestrial Ecosystems of the World and Recent Hurricanes, Cyclones and Typhoons.

Tags

portal item, web map

Sample Code

OpenMapURL.cs
                                                                                                                   
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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 Android.App;
using Android.OS;
using Android.Views;
using Android.Widget;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Linq;

namespace ArcGISRuntime.Samples.OpenMapURL
{
    [Activity(ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [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 : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        // String array to hold urls to publicly available web maps.
        private string[] _itemUrls = {
            "https://arcgis.com/home/item.html?id=92ad152b9da94dee89b9e387dfe21acd",
            "https://arcgis.com/home/item.html?id=5be0bc3ee36c4e058f7b3cebc21c74e6",
            "https://arcgis.com/home/item.html?id=064f2e898b094a17b84e4a4cd5e5f549"
        };

        // String array to store titles for the webmaps specified above.
        private string[] _titles = {
            "Geology for United States",
            "Terrestrial Ecosystems of the World",
            "Recent Hurricanes, Cyclones and Typhoons"
        };

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Open map (URL)";

            // Create the UI, setup the control references and execute initialization
            CreateLayout();
            Initialize();
        }

        private void Initialize()
        {
            // Create a new Map instance with url of the webmap that is displayed by default
            _myMapView.Map = new Map(new Uri(_itemUrls[0]));
        }

        private void OnMapsClicked(object sender, EventArgs e)
        {
            Button mapsButton = (Button)sender;

            // Create menu to show map options
            PopupMenu mapsMenu = new PopupMenu(this, mapsButton);
            mapsMenu.MenuItemClick += OnMapsMenuItemClicked;

            // Create menu options
            foreach (string title in _titles)
                mapsMenu.Menu.Add(title);

            // Show menu in the view
            mapsMenu.Show();
        }

        private void OnMapsMenuItemClicked(object sender, PopupMenu.MenuItemClickEventArgs e)
        {
            // Get title from the selected item
            string selectedMapTitle = e.Item.TitleCondensedFormatted.ToString();

            // Get index that is used to get the selected url
            int selectedIndex = _titles.ToList().IndexOf(selectedMapTitle);

            // Create a new Map instance with url of the webmap that selected
            _myMapView.Map = new Map(new Uri(_itemUrls[selectedIndex]));
        }

        private void CreateLayout()
        {
            // Create a new vertical layout for the app
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Create button to show possible map options
            Button mapsButton = new Button(this)
            {
                Text = "Maps"
            };
            mapsButton.Click += OnMapsClicked;

            // Add maps button to the layout
            layout.AddView(mapsButton);

            // Add the map view to the layout
            _myMapView = new MapView(this);
            layout.AddView(_myMapView);

            // Show the layout in the app
            SetContentView(layout);
        }
    }
}

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