Symbolize shapefile

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Display a shapefile with custom symbology.

Image of symbolize shapefile

Use case

Feature layers created from shapefiles do not possess any rendering information, and will be assigned with a default symbology. You can apply custom styling to ensure that the content is visible and usable in the context of a specific map. For example, you could use this to visually differentiate between features originating from two different shapefiles, by applying a blue color to one, and a red color to the other.

How to use the sample

Tap the button to apply a new symbology renderer to the feature layer created from the shapefile.

How it works

  1. Create a ShapefileFeatureTable, providing the path to a shapefile.
  2. Create a FeatureLayer and associate it with the ShapeFileFeatureTable.
  3. Create a SimpleRenderer to override the default symbology. The simple renderer takes a symbol and applies that to all features in a layer.
  4. Apply the renderer to the FeatureLayer by setting the renderer.

Relevant API

  • FeatureLayer
  • ShapefileFeatureTable
  • SimpleFillSymbol
  • SimpleLineSymbol
  • SimpleRenderer

Offline data

This sample downloads the following items from ArcGIS Online automatically:

  • AuroraCOshp.zip - Shapefiles that cover Aurora Colorado: Public art (points), Bike trails (lines), and Subdivisions (polygons).

About the data

This sample displays a shapefile containing subdivisions in Aurora, CO.

Additional information

While shapefiles contain no rendering information, other data sources such as Service Feature Tables or Geodatabase Feature Tables can contain such information. As a result, the rendering properties of the other data sources can be pre-defined by the author.

Tags

package, shape file, shapefile, symbology, visualization

Sample Code

SymbolizeShapefile.cs
                                                                                                                                                     
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// Copyright 2017 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 Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI.Controls;
using ArcGISRuntime.Samples.Managers;

namespace ArcGISRuntime.Samples.SymbolizeShapefile
{
    [Activity (ConfigurationChanges=Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
	[ArcGISRuntime.Samples.Shared.Attributes.OfflineData("d98b3e5293834c5f852f13c569930caa")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Symbolize shapefile",
        category: "Data",
        description: "Display a shapefile with custom symbology.",
        instructions: "Tap the button to apply a new symbology renderer to the feature layer created from the shapefile. ",
        tags: new[] { "package", "shape file", "shapefile", "symbology", "visualization" })]
    public class SymbolizeShapefile : Activity
    {
        // Hold a reference to the map view
        private MapView _myMapView;

        // Hold a reference to the button
        private Button _myRendererButton;

        // Hold reference to the feature layer so that its renderer can be changed when button is pushed
        private FeatureLayer _shapefileFeatureLayer;

        // Hold reference to default renderer to enable switching back
        private Renderer _defaultRenderer;

        // Hold reference to alternate renderer to enable switching
        private SimpleRenderer _alternateRenderer;

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

            Title = "Symbolize a shapefile";

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

        private async void Initialize()
        {
            // Create the map with topographic basemap
            Map myMap = new Map(BasemapStyle.ArcGISTopographic);

            // Create the point for the map's initial viewpoint
            MapPoint point = new MapPoint(-11662054, 4818336, SpatialReference.Create(3857));

            // Create a viewpoint for the point
            Viewpoint viewpoint = new Viewpoint(point, 200000);

            // Set the initial viewpoint
            myMap.InitialViewpoint = viewpoint;

            // Create a shapefile feature table from the shapefile path
            ShapefileFeatureTable myFeatureTable = new ShapefileFeatureTable(GetShapefilePath());

            // Create a layer from the feature table
            _shapefileFeatureLayer = new FeatureLayer(myFeatureTable);

            // Add the layer to the map
            myMap.OperationalLayers.Add(_shapefileFeatureLayer);

            // Create the symbology for the alternate renderer
            SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.Red, 1.0);
            SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, System.Drawing.Color.Yellow, lineSymbol);

            // Create the alternate renderer
            _alternateRenderer = new SimpleRenderer(fillSymbol);

            try
            {
                // Wait for the layer to load so that it will be assigned a default renderer
                await _shapefileFeatureLayer.LoadAsync();

                // Hold a reference to the default renderer (to enable switching between the renderers)
                _defaultRenderer = _shapefileFeatureLayer.Renderer;

                // Add the map to the mapview
                _myMapView.Map = myMap;

                // Enable changing symbology now that sample is loaded
                _myRendererButton.Enabled = true;
            }
            catch (Exception e)
            {
                new AlertDialog.Builder(this).SetMessage(e.ToString()).SetTitle("Error").Show();
            }
        }

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

            // Create the button
            _myRendererButton = new Button(this) { Enabled = false, Text = "Change renderer" };

            // Add the button to the layout
            layout.AddView(_myRendererButton);

            // Subscribe to button push events
            _myRendererButton.Click += _myRendererButton_Click;

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

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

        private void _myRendererButton_Click(object sender, System.EventArgs e)
        {
            // Toggle the renderer
            if (_shapefileFeatureLayer.Renderer == _defaultRenderer)
            {
                _shapefileFeatureLayer.Renderer = _alternateRenderer;
            }
            else
            {
                _shapefileFeatureLayer.Renderer = _defaultRenderer;
            }
        }

        private static string GetShapefilePath()
        {
            return DataManager.GetDataFolder("d98b3e5293834c5f852f13c569930caa", "Subdivisions.shp");
        }
    }
}

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