A map image layer may contain many sublayers such as different types of roads in a road network or city, county, and state borders in a US map. The user may only be interested in a subset of these sublayers. Or, perhaps showing all of the sublayers would show too much detail. In these cases, you can hide certain sublayers by changing their visibility.
How to use the sample
Each sublayer has a check box which can be used to toggle the visibility of the sublayer.
How it works
Create an ArcGISMapImageLayer object with the URL to a map image service.
Get the list of sublayers with mapImageLayer.Sublayers.
For each layer in the sublayer list, set its visible property to true or false.
Relevant API
ArcGISMapImageLayer
Tags
layers, sublayers, visibility
Sample Code
ChangeSublayerVisibility.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 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;
namespaceArcGISRuntime.Samples.ChangeSublayerVisibility{
[Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Map image layer sublayer visibility",
category: "Layers",
description: "Change the visibility of sublayers.",
instructions: "Each sublayer has a check box which can be used to toggle the visibility of the sublayer.",
tags: new[] { "layers", "sublayers", "visibility" })]
publicclassChangeSublayerVisibility : Activity {
// Hold a reference to the map viewprivate MapView _myMapView;
// Hold reference to image layer for easier access to sublayersprivate ArcGISMapImageLayer _imageLayer;
protectedoverridevoidOnCreate(Bundle bundle) {
base.OnCreate(bundle);
Title = "Change sublayer visibility";
// Create the UI, setup the control references and execute initialization CreateLayout();
Initialize();
}
privatevoidInitialize() {
// Create new Map Map myMap = new Map();
// Create uri to the map image layer Uri serviceUri = new Uri(
"https://sampleserver6.arcgisonline.com/arcgis/rest/services/SampleWorldCities/MapServer");
// Create new image layer from the url _imageLayer = new ArcGISMapImageLayer(serviceUri)
{
Name = "World Cities Population" };
// Add created layer to the basemaps collection myMap.Basemap.BaseLayers.Add(_imageLayer);
// Assign the map to the MapView _myMapView.Map = myMap;
}
privateasyncvoidOnSublayersClicked(object sender, EventArgs e) {
try {
// Make sure that layer and it's sublayers are loaded// If layer is already loaded, this returns directlyawait _imageLayer.LoadAsync();
Button sublayersButton = (Button)sender;
// Create menu to change sublayer visibility PopupMenu sublayersMenu = new PopupMenu(this, sublayersButton);
sublayersMenu.MenuItemClick += OnSublayersMenuItemClicked;
// Create menu optionsforeach (ArcGISSublayer sublayer in _imageLayer.Sublayers)
sublayersMenu.Menu.Add(sublayer.Name);
// Set values to the menu itemsfor (int i = 0; i < sublayersMenu.Menu.Size(); i++)
{
IMenuItem menuItem = sublayersMenu.Menu.GetItem(i);
// Set menu item to contain checkbox menuItem.SetCheckable(true);
// Set default value menuItem.SetChecked(_imageLayer.Sublayers[i].IsVisible);
}
// Show menu in the view sublayersMenu.Show();
}
catch (Exception ex)
{
new AlertDialog.Builder(this).SetMessage(ex.ToString()).SetTitle("Error").Show();
}
}
privatevoidOnSublayersMenuItemClicked(object sender, PopupMenu.MenuItemClickEventArgs e) {
// Change the checked value e.Item.SetChecked(!e.Item.IsChecked);
// Get title from the selected itemstring selectedSublayerTitle = e.Item.TitleCondensedFormatted.ToString();
// Get index that is used to get the selected url ArcGISSublayer sublayer = _imageLayer.Sublayers.First(x => x.Name == selectedSublayerTitle);
sublayer.IsVisible = e.Item.IsChecked;
}
privatevoidCreateLayout() {
// 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 = "Sublayers" };
mapsButton.Click += OnSublayersClicked;
// 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);
}
}
}