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Group layers

A scene with a group layer


// Copyright 2019 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:
// 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;
using System.Threading.Tasks;

namespace ArcGISRuntimeXamarin.Samples.GroupLayers
        "Group layers",
        "Group a collection of layers together and toggle their visibility as a group.",
    public class GroupLayers : Activity
        // Hold references to the UI controls.
        private SceneView _mySceneView;
        private LinearLayout _layerListView;

        protected override void OnCreate(Bundle bundle)

            Title = "Group layers";


        private async void Initialize()
            // Create the layers.
            ArcGISSceneLayer devOne = new ArcGISSceneLayer(new Uri(""));
            ArcGISSceneLayer devTwo = new ArcGISSceneLayer(new Uri(""));
            ArcGISSceneLayer devThree = new ArcGISSceneLayer(new Uri(""));
            ArcGISSceneLayer nonDevOne = new ArcGISSceneLayer(new Uri(""));
            FeatureLayer nonDevTwo = new FeatureLayer(new Uri(""));

            // Create the group layer and add sublayers.
            GroupLayer gLayer = new GroupLayer();
            gLayer.Name = "Group: Dev A";

            // Create the scene with a basemap.
            _mySceneView.Scene = new Scene(Basemap.CreateImagery());

            // Add the top-level layers to the scene.

            // Wait for all of the layers in the group layer to load.
            await Task.WhenAll(gLayer.Layers.ToList().Select(m => m.LoadAsync()).ToList());

            // Zoom to the extent of the group layer.
            _mySceneView.SetViewpoint(new Viewpoint(gLayer.FullExtent));

            // Add the layer list to the UI.
            foreach (Layer layer in _mySceneView.Scene.OperationalLayers)

        private async void AddLayersToUI(Layer layer, int nestLevel = 0)
            // Wait for the layer to load - ensures that the UI will be up-to-date.
            await layer.LoadAsync();

            // Add a row for the current layer.
            _layerListView.AddView(ViewForLayer(layer, nestLevel));

            // Add rows for any children of this layer if it is a group layer.
            if (layer is GroupLayer layerGroup)
                foreach (Layer child in layerGroup.Layers)
                    AddLayersToUI(child, nestLevel + 1);

        private View ViewForLayer(Layer layer, int nestLevel = 0)
            // Create the view that holds the row.
            LinearLayout rowContainer = new LinearLayout(this);
            rowContainer.Orientation = Orientation.Horizontal;

            // Padding implements the nesting/hieararchy display.
            rowContainer.SetPadding(32 * nestLevel, 0, 0, 0);

            // Create and configure the visibility toggle.
            CheckBox toggle = new CheckBox(this);
            toggle.Checked = true;
            toggle.CheckedChange += (sender, args) => layer.IsVisible = toggle.Checked;

            // Add a label for the layer.
            rowContainer.AddView(new TextView(this) {Text = layer.Name});

            return rowContainer;

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

            _layerListView = new LinearLayout(this);
            _layerListView.Orientation = Orientation.Vertical;


            // Add the map view to the layout.
            _mySceneView = new SceneView();

            // Show the layout in the app.

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