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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.Collections.Generic;
using System.Linq;
namespace ArcGISRuntime.Samples.ChangeBasemap
{
[Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Change basemap",
category: "Map",
description: "Change a map's basemap. A basemap is beneath all layers on a `Map` and is used to provide visual reference for the operational layers.",
instructions: "Use the drop down menu to select the active basemap from the list of available basemaps.",
tags: new[] { "basemap", "map" })]
public class ChangeBasemap : Activity
{
// Create and hold reference to the used MapView
private MapView _myMapView;
// Dictionary that associates names with basemaps.
private readonly Dictionary<string, Basemap> _basemapOptions = new Dictionary<string, Basemap>()
{
{"Streets", new Basemap(BasemapStyle.ArcGISStreets)},
{"Streets - Night", new Basemap(BasemapStyle.ArcGISStreetsNight)},
{"Imagery", new Basemap(BasemapStyle.ArcGISImageryStandard)},
{"Imagery with Labels", new Basemap(BasemapStyle.ArcGISImagery)},
{"Dark Gray Canvas", new Basemap(BasemapStyle.ArcGISDarkGray)},
{"Light Gray Canvas", new Basemap(BasemapStyle.ArcGISLightGray)},
{"Navigation", new Basemap(BasemapStyle.ArcGISNavigation)},
{"OpenStreetMap", new Basemap(BasemapStyle.OSMStandard)}
};
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
Title = "Change basemap";
// Create the UI, setup the control references and execute initialization
CreateLayout();
Initialize();
}
private void Initialize()
{
// Create new Map with basemap
Map myMap = new Map(_basemapOptions.Values.First());
// Provide used Map to the MapView
_myMapView.Map = myMap;
}
private void OnBasemapsClicked(object sender, EventArgs e)
{
// Get a reference to the button
Button mapsButton = (Button)sender;
// Create menu to show map options
PopupMenu mapsMenu = new PopupMenu(this, mapsButton);
mapsMenu.MenuItemClick += OnBasemapsMenuItemClicked;
// Create menu options
foreach (string basemapType in _basemapOptions.Keys)
{
mapsMenu.Menu.Add(basemapType);
}
// Show menu in the view
mapsMenu.Show();
}
private void OnBasemapsMenuItemClicked(object sender, PopupMenu.MenuItemClickEventArgs e)
{
// Get title from the selected item
string selectedBasemap = e.Item.TitleCondensedFormatted.ToString();
// Retrieve the basemap from the dictionary
_myMapView.Map.Basemap = _basemapOptions[selectedBasemap];
}
private void CreateLayout()
{
// Create a new vertical layout for the app
LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };
// Create button to show map options
Button mapsButton = new Button(this)
{
Text = "Choose basemap"
};
mapsButton.Click += OnBasemapsClicked;
// 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);
}
}
}