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
Create a ShapefileFeatureTable, providing the path to a shapefile.
Create a FeatureLayer and associate it with the ShapeFileFeatureTable.
Create a SimpleRenderer to override the default symbology. The simple renderer takes a symbol and applies that to all features in a layer.
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:
Aurora_CO_shp.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.
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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;
namespaceArcGISRuntime.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" })]
publicclassSymbolizeShapefile : Activity {
// Hold a reference to the map viewprivate MapView _myMapView;
// Hold a reference to the buttonprivate Button _myRendererButton;
// Hold reference to the feature layer so that its renderer can be changed when button is pushedprivate FeatureLayer _shapefileFeatureLayer;
// Hold reference to default renderer to enable switching backprivate Renderer _defaultRenderer;
// Hold reference to alternate renderer to enable switchingprivate SimpleRenderer _alternateRenderer;
protectedoverridevoidOnCreate(Bundle bundle) {
base.OnCreate(bundle);
Title = "Symbolize a shapefile";
// Create the UI, setup the control references and execute initialization CreateLayout();
Initialize();
}
privateasyncvoidInitialize() {
// 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 rendererawait _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();
}
}
privatevoidCreateLayout() {
// 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);
}
privatevoid _myRendererButton_Click(object sender, System.EventArgs e)
{
// Toggle the rendererif (_shapefileFeatureLayer.Renderer == _defaultRenderer)
{
_shapefileFeatureLayer.Renderer = _alternateRenderer;
}
else {
_shapefileFeatureLayer.Renderer = _defaultRenderer;
}
}
privatestaticstringGetShapefilePath() {
return DataManager.GetDataFolder("d98b3e5293834c5f852f13c569930caa", "Subdivisions.shp");
}
}
}