Style a feature layer

Learn how to apply renderers and label definitions to a feature layer based on attribute values.

Applications can display feature layer data with different styles to enhance the visualization. The type of Renderer you choose depends on your application. A SimpleRenderer applies the same symbol to all features, a UniqueValueRenderer applies a different symbol to each unique attribute value, and a ClassBreaksRenderer applies a symbol to a range of numeric values. Renderers are responsible for accessing the data and applying the appropriate symbol to each feature when the layer draws. You can also use a LabelDefinition to show attribute information for features. Visit the Styles and data visualization documentation to learn more about styling layers.

You can also author, style and save web maps, web scenes, and layers as portal items and then add them to the map in your application. Visit the following tutorials to learn more about adding portal items.

• Display a web map
• Display a web scene
• Add a feature layer from a portal item

In this tutorial, you will apply different renderers to enhance the visualization of three feature layers with data for the Santa Monica Mountains: Trailheads with a single symbol, Trails based on elevation change and bike use, and Parks and Open Spaces based on the type of park.

Prerequisites

Steps

Open a Java project with Gradle

1. To start this tutorial, complete the Display a map tutorial, or download and unzip the Display a map solution into a new folder.

2. Open the build.gradle file as a project in IntelliJ IDEA.

3. If you downloaded the solution project, set your API key.

   More info

   An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

   1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

   2. In the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and click App.

   3. In the start() method, set the API key property on the ArcGISRuntimeEnvironment with your API key. Replace YOUR_API_KEY with your actual API Key. Be sure to surround your API Key with quotes, because the parameter passed to setApiKey is a string.

      App.java

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      //   Copyright 2020 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.
      
      package com.example.app;
      
      import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
      import com.esri.arcgisruntime.mapping.ArcGISMap;
      import com.esri.arcgisruntime.mapping.BasemapStyle;
      import com.esri.arcgisruntime.mapping.Viewpoint;
      import com.esri.arcgisruntime.mapping.view.MapView;
      
      import javafx.application.Application;
      import javafx.scene.Scene;
      import javafx.scene.layout.StackPane;
      import javafx.stage.Stage;
      
      public class App extends Application {
      
        private MapView mapView;
      
        public static void main(String[] args) {
          Application.launch(args);
        }
      
        @Override
        public void start(Stage stage) {
          // set the title and size of the stage and show it
          stage.setTitle("Display a map tutorial");
          stage.setWidth(800);
          stage.setHeight(700);
          stage.show();
      
          // create a JavaFX scene with a stack pane as the root node, and add it to the scene
          StackPane stackPane = new StackPane();
          Scene scene = new Scene(stackPane);
          stage.setScene(scene);
      
          // Note: it is not best practice to store API keys in source code.
          // The API key is referenced here for the convenience of this tutorial.
          String yourApiKey = "YOUR_API_KEY";
          ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
      
          // create a map view to display the map and add it to the stack pane
          mapView = new MapView();
          stackPane.getChildren().add(mapView);
      
          ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
      
          // set the map on the map view
          mapView.setMap(map);
      
          mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
      
        }
      
        /**
         * Stops and releases all resources used in application.
         */
        @Override
        public void stop() {
          if (mapView != null) {
            mapView.dispose();
          }
        }
      
      }
      

Preconfigure app

Modify the files from the Display a map tutorial so they can be used in this tutorial: you will change the app title, modify the viewpoint, and move the declaration of the map variable.

1. In the start() lifecycle method, change the title that will appear on the application window to Style a feature layer.

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   //   Copyright 2022 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.arcgisservices.LabelDefinition;
   import com.esri.arcgisruntime.data.ServiceFeatureTable;
   import com.esri.arcgisruntime.layers.FeatureLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.labeling.ArcadeLabelExpression;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer.ClassBreak;
   import com.esri.arcgisruntime.symbology.PictureMarkerSymbol;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleRenderer;
   import com.esri.arcgisruntime.symbology.TextSymbol;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer.UniqueValue;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class App extends Application {
   
     private MapView mapView;
   
     private ArcGISMap map =new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
     // colors for symbols
     private static final int RED = 0xFFFF0000;
     private static final int GREEN = 0xFF00FF00;
     private static final int BLUE = 0xFF0000FF;
     private static final int PURPLE = 0xFF800080;
     private static final int WHITE = 0xFFFFFFFF;
   
     // Application constants used to connect to data and resources.
     private final String parksAndOpenSpaces =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0";
     private final String trails =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0";
     private final String trailheads =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";
     private final String trailheadImage = "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png";
   
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
   
       // set the title and size of the stage and show it
       stage.setTitle("Style a feature layer");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEy";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0));
   
       addOpenSpaceLayer();
   
       addTrailsLayer();
   
       addBikeOnlyTrailsLayer();
   
       addNoBikesTrailsLayer();
   
       addTrailHeadsLayer();
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
     private FeatureLayer addFeatureLayer(String featureServiceUri){
       // Create a service feature table from a Uri.
       ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(featureServiceUri);
       // Create a feature layer from the service feature table.
       FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
       // Add the feature layer to the map's list of operational layers.
       map.getOperationalLayers().add(featureLayer);
       // return the feature layer
       return featureLayer;
     }
   
     private void addOpenSpaceLayer() {
       // Create a parks and open spaces feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(parksAndOpenSpaces);
   
       // Create fill symbols.
       SimpleFillSymbol purpleFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, PURPLE, null);
       SimpleFillSymbol greenFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, GREEN, null);
       SimpleFillSymbol blueFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, BLUE, null);
       SimpleFillSymbol redFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, RED, null);
   
       // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks.
       List<Object> naturalAreasValue = new ArrayList<>();
       naturalAreasValue.add("Natural Areas");
       UniqueValue naturalAreas =
           new UniqueValue("Natural Areas", "Natural Areas", purpleFillSymbol, naturalAreasValue);
   
       List<Object> regionalOpenSpaceValue = new ArrayList<>();
       naturalAreasValue.add("Regional Open Space");
       UniqueValue regionalOpenSpace =
           new UniqueValue("Regional Open Space", "Regional Open Space", greenFillSymbol, regionalOpenSpaceValue);
   
       List<Object> localParkValue = new ArrayList<>();
       localParkValue.add("Local Park");
       UniqueValue localPark =
           new UniqueValue("Local Park", "Local Park", blueFillSymbol, localParkValue);
   
       List<Object> regionalRecreationParkValue = new ArrayList<>();
       regionalRecreationParkValue.add("Regional Recreation Park");
       UniqueValue regionalRecreationPark =
           new UniqueValue("Regional Recreation Park", "Regional Recreation Park", redFillSymbol, regionalRecreationParkValue);
   
       List<UniqueValue> uniqueValuesList = new ArrayList<>();
       uniqueValuesList.add(naturalAreas);
       uniqueValuesList.add(regionalOpenSpace);
       uniqueValuesList.add(localPark);
       uniqueValuesList.add(regionalRecreationPark);
   
       // Create a unique value renderer and set it on the parks and open spaces feature layer.
       // fieldNames is a List, but in this tutorial there is only one item in the list
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("TYPE");
       UniqueValueRenderer openSpacesUniqueValueRenderer =
           new UniqueValueRenderer(fieldNames, uniqueValuesList, "Open Spaces", null);
       featureLayer.setRenderer(openSpacesUniqueValueRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.2f);
     }
   
     private void addTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Create simple line symbols.
       SimpleLineSymbol firstClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 3.0f);
       SimpleLineSymbol secondClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 4.0f);
       SimpleLineSymbol thirdClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 5.0f);
       SimpleLineSymbol fourthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 6.0f);
       SimpleLineSymbol fifthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 7.0f);
   
       // Create five class breaks.
       ClassBreak firstClassBreak =
           new ClassBreak("Under 500", "0 - 500", 0.0, 500.0, firstClassSymbol);
       ClassBreaksRenderer.ClassBreak secondClassBreak =
           new  ClassBreak("501 to 1000", "501 - 1000", 501.0, 1000.0, secondClassSymbol);
       ClassBreak thirdClassBreak =
           new  ClassBreak("1001 to 1500", "1001 - 1500", 1001.0, 1500.0, thirdClassSymbol);
       ClassBreak fourthClassBreak =
           new  ClassBreak("1501 to 2000", "1501 - 2000", 1501.0, 2000.0, fourthClassSymbol);
       ClassBreak fifthClassBreak =
           new ClassBreak("2001 to 2300", "2001 - 2300", 2001.0, 2300.0, fifthClassSymbol);
   
       List<ClassBreak> elevationBreaks = new ArrayList<>();
       elevationBreaks.add(firstClassBreak);
       elevationBreaks.add(secondClassBreak);
       elevationBreaks.add(thirdClassBreak);
       elevationBreaks.add(fourthClassBreak);
       elevationBreaks.add(fifthClassBreak);
   
       // Create a class breaks renderer and set it on the feature layer.
       ClassBreaksRenderer elevationClassBreaksRenderer =
           new ClassBreaksRenderer("ELEV_GAIN", elevationBreaks);
       featureLayer.setRenderer(elevationClassBreaksRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.75f);
   
     }
   
     private void addBikeOnlyTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'Yes'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol bikeTrailSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, BLUE, 2.0f);
       SimpleRenderer bikeTrailRenderer = new SimpleRenderer(bikeTrailSymbol);
       featureLayer.setRenderer(bikeTrailRenderer);
   
     }
   
     private void addNoBikesTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that don't permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'No'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol noBikeTrailSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, RED, 2.0f);
       SimpleRenderer noBikeTrailRenderer =
           new SimpleRenderer(noBikeTrailSymbol);
       featureLayer.setRenderer(noBikeTrailRenderer);
     }
   
     private LabelDefinition makeLabelDefinition(String labelAttribute){
       // Create a new text symbol.
       TextSymbol labelTextSymbol  = new TextSymbol();
       labelTextSymbol.setColor(WHITE);
       labelTextSymbol.setSize(12.0f);
       labelTextSymbol.setHaloColor(RED);
       labelTextSymbol.setHaloWidth(1.0f);
       labelTextSymbol.setFontFamily("Arial");
       labelTextSymbol.setFontStyle(TextSymbol.FontStyle.ITALIC);
       labelTextSymbol.setFontWeight(TextSymbol.FontWeight.NORMAL);
   
       // Create a new Arcade label expression based on the field name.
       ArcadeLabelExpression labelExpression =
           new ArcadeLabelExpression("$feature." + labelAttribute);
   
       // Create and return the label definition.
       return new LabelDefinition(labelExpression, labelTextSymbol);
   
     }
   
     private void addTrailHeadsLayer() {
   
       // Create a trailheads feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trailheads);
   
       // Create a new picture marker symbol that uses the trailhead image.
       PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(trailheadImage);
       pictureMarkerSymbol.setHeight(18.0f);
       pictureMarkerSymbol.setWidth(18.0f);
   
   
       // Create a new simple renderer based on the picture marker symbol.
       SimpleRenderer simpleRenderer = new SimpleRenderer(pictureMarkerSymbol);
   
       // Set the feature layer's renderer, and enable labels.
       featureLayer.setRenderer(simpleRenderer);
       featureLayer.setLabelsEnabled(true);
   
       // Create the label definition.
       LabelDefinition trailHeadsDefinition = makeLabelDefinition("TRL_NAME");
   
       // Add the label definition to the layer's list of label definitions.
       featureLayer.getLabelDefinitions().add(trailHeadsDefinition);
   
     }
   
   }
   

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2. Modify the Viewpoint constructor call so it passes a scale parameter of 72.000.0, which is more appropriate to this tutorial.

   App.java

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   //   Copyright 2022 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.arcgisservices.LabelDefinition;
   import com.esri.arcgisruntime.data.ServiceFeatureTable;
   import com.esri.arcgisruntime.layers.FeatureLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.labeling.ArcadeLabelExpression;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer.ClassBreak;
   import com.esri.arcgisruntime.symbology.PictureMarkerSymbol;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleRenderer;
   import com.esri.arcgisruntime.symbology.TextSymbol;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer.UniqueValue;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class App extends Application {
   
     private MapView mapView;
   
     private ArcGISMap map =new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
     // colors for symbols
     private static final int RED = 0xFFFF0000;
     private static final int GREEN = 0xFF00FF00;
     private static final int BLUE = 0xFF0000FF;
     private static final int PURPLE = 0xFF800080;
     private static final int WHITE = 0xFFFFFFFF;
   
     // Application constants used to connect to data and resources.
     private final String parksAndOpenSpaces =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0";
     private final String trails =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0";
     private final String trailheads =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";
     private final String trailheadImage = "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png";
   
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
   
       // set the title and size of the stage and show it
       stage.setTitle("Style a feature layer");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEy";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0));
   
       addOpenSpaceLayer();
   
       addTrailsLayer();
   
       addBikeOnlyTrailsLayer();
   
       addNoBikesTrailsLayer();
   
       addTrailHeadsLayer();
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
     private FeatureLayer addFeatureLayer(String featureServiceUri){
       // Create a service feature table from a Uri.
       ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(featureServiceUri);
       // Create a feature layer from the service feature table.
       FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
       // Add the feature layer to the map's list of operational layers.
       map.getOperationalLayers().add(featureLayer);
       // return the feature layer
       return featureLayer;
     }
   
     private void addOpenSpaceLayer() {
       // Create a parks and open spaces feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(parksAndOpenSpaces);
   
       // Create fill symbols.
       SimpleFillSymbol purpleFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, PURPLE, null);
       SimpleFillSymbol greenFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, GREEN, null);
       SimpleFillSymbol blueFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, BLUE, null);
       SimpleFillSymbol redFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, RED, null);
   
       // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks.
       List<Object> naturalAreasValue = new ArrayList<>();
       naturalAreasValue.add("Natural Areas");
       UniqueValue naturalAreas =
           new UniqueValue("Natural Areas", "Natural Areas", purpleFillSymbol, naturalAreasValue);
   
       List<Object> regionalOpenSpaceValue = new ArrayList<>();
       naturalAreasValue.add("Regional Open Space");
       UniqueValue regionalOpenSpace =
           new UniqueValue("Regional Open Space", "Regional Open Space", greenFillSymbol, regionalOpenSpaceValue);
   
       List<Object> localParkValue = new ArrayList<>();
       localParkValue.add("Local Park");
       UniqueValue localPark =
           new UniqueValue("Local Park", "Local Park", blueFillSymbol, localParkValue);
   
       List<Object> regionalRecreationParkValue = new ArrayList<>();
       regionalRecreationParkValue.add("Regional Recreation Park");
       UniqueValue regionalRecreationPark =
           new UniqueValue("Regional Recreation Park", "Regional Recreation Park", redFillSymbol, regionalRecreationParkValue);
   
       List<UniqueValue> uniqueValuesList = new ArrayList<>();
       uniqueValuesList.add(naturalAreas);
       uniqueValuesList.add(regionalOpenSpace);
       uniqueValuesList.add(localPark);
       uniqueValuesList.add(regionalRecreationPark);
   
       // Create a unique value renderer and set it on the parks and open spaces feature layer.
       // fieldNames is a List, but in this tutorial there is only one item in the list
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("TYPE");
       UniqueValueRenderer openSpacesUniqueValueRenderer =
           new UniqueValueRenderer(fieldNames, uniqueValuesList, "Open Spaces", null);
       featureLayer.setRenderer(openSpacesUniqueValueRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.2f);
     }
   
     private void addTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Create simple line symbols.
       SimpleLineSymbol firstClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 3.0f);
       SimpleLineSymbol secondClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 4.0f);
       SimpleLineSymbol thirdClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 5.0f);
       SimpleLineSymbol fourthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 6.0f);
       SimpleLineSymbol fifthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 7.0f);
   
       // Create five class breaks.
       ClassBreak firstClassBreak =
           new ClassBreak("Under 500", "0 - 500", 0.0, 500.0, firstClassSymbol);
       ClassBreaksRenderer.ClassBreak secondClassBreak =
           new  ClassBreak("501 to 1000", "501 - 1000", 501.0, 1000.0, secondClassSymbol);
       ClassBreak thirdClassBreak =
           new  ClassBreak("1001 to 1500", "1001 - 1500", 1001.0, 1500.0, thirdClassSymbol);
       ClassBreak fourthClassBreak =
           new  ClassBreak("1501 to 2000", "1501 - 2000", 1501.0, 2000.0, fourthClassSymbol);
       ClassBreak fifthClassBreak =
           new ClassBreak("2001 to 2300", "2001 - 2300", 2001.0, 2300.0, fifthClassSymbol);
   
       List<ClassBreak> elevationBreaks = new ArrayList<>();
       elevationBreaks.add(firstClassBreak);
       elevationBreaks.add(secondClassBreak);
       elevationBreaks.add(thirdClassBreak);
       elevationBreaks.add(fourthClassBreak);
       elevationBreaks.add(fifthClassBreak);
   
       // Create a class breaks renderer and set it on the feature layer.
       ClassBreaksRenderer elevationClassBreaksRenderer =
           new ClassBreaksRenderer("ELEV_GAIN", elevationBreaks);
       featureLayer.setRenderer(elevationClassBreaksRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.75f);
   
     }
   
     private void addBikeOnlyTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'Yes'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol bikeTrailSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, BLUE, 2.0f);
       SimpleRenderer bikeTrailRenderer = new SimpleRenderer(bikeTrailSymbol);
       featureLayer.setRenderer(bikeTrailRenderer);
   
     }
   
     private void addNoBikesTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that don't permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'No'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol noBikeTrailSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, RED, 2.0f);
       SimpleRenderer noBikeTrailRenderer =
           new SimpleRenderer(noBikeTrailSymbol);
       featureLayer.setRenderer(noBikeTrailRenderer);
     }
   
     private LabelDefinition makeLabelDefinition(String labelAttribute){
       // Create a new text symbol.
       TextSymbol labelTextSymbol  = new TextSymbol();
       labelTextSymbol.setColor(WHITE);
       labelTextSymbol.setSize(12.0f);
       labelTextSymbol.setHaloColor(RED);
       labelTextSymbol.setHaloWidth(1.0f);
       labelTextSymbol.setFontFamily("Arial");
       labelTextSymbol.setFontStyle(TextSymbol.FontStyle.ITALIC);
       labelTextSymbol.setFontWeight(TextSymbol.FontWeight.NORMAL);
   
       // Create a new Arcade label expression based on the field name.
       ArcadeLabelExpression labelExpression =
           new ArcadeLabelExpression("$feature." + labelAttribute);
   
       // Create and return the label definition.
       return new LabelDefinition(labelExpression, labelTextSymbol);
   
     }
   
     private void addTrailHeadsLayer() {
   
       // Create a trailheads feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trailheads);
   
       // Create a new picture marker symbol that uses the trailhead image.
       PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(trailheadImage);
       pictureMarkerSymbol.setHeight(18.0f);
       pictureMarkerSymbol.setWidth(18.0f);
   
   
       // Create a new simple renderer based on the picture marker symbol.
       SimpleRenderer simpleRenderer = new SimpleRenderer(pictureMarkerSymbol);
   
       // Set the feature layer's renderer, and enable labels.
       featureLayer.setRenderer(simpleRenderer);
       featureLayer.setLabelsEnabled(true);
   
       // Create the label definition.
       LabelDefinition trailHeadsDefinition = makeLabelDefinition("TRL_NAME");
   
       // Add the label definition to the layer's list of label definitions.
       featureLayer.getLabelDefinitions().add(trailHeadsDefinition);
   
     }
   
   }
   

3. Move the declaration of the map variable to the top level of the App class. Since map will be accessed from a new method later, it must be a field of the class, rather than a local variable in start().

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   //   Copyright 2020 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.view.MapView;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   public class App extends Application {
   
     private MapView mapView;
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
       // set the title and size of the stage and show it
       stage.setTitle("Display a map tutorial");
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEY";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 144447.638572));
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
   }
   

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   //   Copyright 2022 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.arcgisservices.LabelDefinition;
   import com.esri.arcgisruntime.data.ServiceFeatureTable;
   import com.esri.arcgisruntime.layers.FeatureLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.labeling.ArcadeLabelExpression;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer.ClassBreak;
   import com.esri.arcgisruntime.symbology.PictureMarkerSymbol;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleRenderer;
   import com.esri.arcgisruntime.symbology.TextSymbol;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer.UniqueValue;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class App extends Application {
   
     private MapView mapView;
   
     private ArcGISMap map =new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
     // colors for symbols
     private static final int RED = 0xFFFF0000;
     private static final int GREEN = 0xFF00FF00;
     private static final int BLUE = 0xFF0000FF;
     private static final int PURPLE = 0xFF800080;
     private static final int WHITE = 0xFFFFFFFF;
   
     // Application constants used to connect to data and resources.
     private final String parksAndOpenSpaces =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0";
     private final String trails =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0";
     private final String trailheads =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";
     private final String trailheadImage = "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png";
   
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
   
       // set the title and size of the stage and show it
       stage.setTitle("Style a feature layer");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEy";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0));
   
       addOpenSpaceLayer();
   
       addTrailsLayer();
   
       addBikeOnlyTrailsLayer();
   
       addNoBikesTrailsLayer();
   
       addTrailHeadsLayer();
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
     private FeatureLayer addFeatureLayer(String featureServiceUri){
       // Create a service feature table from a Uri.
       ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(featureServiceUri);
       // Create a feature layer from the service feature table.
       FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
       // Add the feature layer to the map's list of operational layers.
       map.getOperationalLayers().add(featureLayer);
       // return the feature layer
       return featureLayer;
     }
   
     private void addOpenSpaceLayer() {
       // Create a parks and open spaces feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(parksAndOpenSpaces);
   
       // Create fill symbols.
       SimpleFillSymbol purpleFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, PURPLE, null);
       SimpleFillSymbol greenFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, GREEN, null);
       SimpleFillSymbol blueFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, BLUE, null);
       SimpleFillSymbol redFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, RED, null);
   
       // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks.
       List<Object> naturalAreasValue = new ArrayList<>();
       naturalAreasValue.add("Natural Areas");
       UniqueValue naturalAreas =
           new UniqueValue("Natural Areas", "Natural Areas", purpleFillSymbol, naturalAreasValue);
   
       List<Object> regionalOpenSpaceValue = new ArrayList<>();
       naturalAreasValue.add("Regional Open Space");
       UniqueValue regionalOpenSpace =
           new UniqueValue("Regional Open Space", "Regional Open Space", greenFillSymbol, regionalOpenSpaceValue);
   
       List<Object> localParkValue = new ArrayList<>();
       localParkValue.add("Local Park");
       UniqueValue localPark =
           new UniqueValue("Local Park", "Local Park", blueFillSymbol, localParkValue);
   
       List<Object> regionalRecreationParkValue = new ArrayList<>();
       regionalRecreationParkValue.add("Regional Recreation Park");
       UniqueValue regionalRecreationPark =
           new UniqueValue("Regional Recreation Park", "Regional Recreation Park", redFillSymbol, regionalRecreationParkValue);
   
       List<UniqueValue> uniqueValuesList = new ArrayList<>();
       uniqueValuesList.add(naturalAreas);
       uniqueValuesList.add(regionalOpenSpace);
       uniqueValuesList.add(localPark);
       uniqueValuesList.add(regionalRecreationPark);
   
       // Create a unique value renderer and set it on the parks and open spaces feature layer.
       // fieldNames is a List, but in this tutorial there is only one item in the list
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("TYPE");
       UniqueValueRenderer openSpacesUniqueValueRenderer =
           new UniqueValueRenderer(fieldNames, uniqueValuesList, "Open Spaces", null);
       featureLayer.setRenderer(openSpacesUniqueValueRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.2f);
     }
   
     private void addTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Create simple line symbols.
       SimpleLineSymbol firstClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 3.0f);
       SimpleLineSymbol secondClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 4.0f);
       SimpleLineSymbol thirdClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 5.0f);
       SimpleLineSymbol fourthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 6.0f);
       SimpleLineSymbol fifthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 7.0f);
   
       // Create five class breaks.
       ClassBreak firstClassBreak =
           new ClassBreak("Under 500", "0 - 500", 0.0, 500.0, firstClassSymbol);
       ClassBreaksRenderer.ClassBreak secondClassBreak =
           new  ClassBreak("501 to 1000", "501 - 1000", 501.0, 1000.0, secondClassSymbol);
       ClassBreak thirdClassBreak =
           new  ClassBreak("1001 to 1500", "1001 - 1500", 1001.0, 1500.0, thirdClassSymbol);
       ClassBreak fourthClassBreak =
           new  ClassBreak("1501 to 2000", "1501 - 2000", 1501.0, 2000.0, fourthClassSymbol);
       ClassBreak fifthClassBreak =
           new ClassBreak("2001 to 2300", "2001 - 2300", 2001.0, 2300.0, fifthClassSymbol);
   
       List<ClassBreak> elevationBreaks = new ArrayList<>();
       elevationBreaks.add(firstClassBreak);
       elevationBreaks.add(secondClassBreak);
       elevationBreaks.add(thirdClassBreak);
       elevationBreaks.add(fourthClassBreak);
       elevationBreaks.add(fifthClassBreak);
   
       // Create a class breaks renderer and set it on the feature layer.
       ClassBreaksRenderer elevationClassBreaksRenderer =
           new ClassBreaksRenderer("ELEV_GAIN", elevationBreaks);
       featureLayer.setRenderer(elevationClassBreaksRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.75f);
   
     }
   
     private void addBikeOnlyTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'Yes'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol bikeTrailSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, BLUE, 2.0f);
       SimpleRenderer bikeTrailRenderer = new SimpleRenderer(bikeTrailSymbol);
       featureLayer.setRenderer(bikeTrailRenderer);
   
     }
   
     private void addNoBikesTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that don't permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'No'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol noBikeTrailSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, RED, 2.0f);
       SimpleRenderer noBikeTrailRenderer =
           new SimpleRenderer(noBikeTrailSymbol);
       featureLayer.setRenderer(noBikeTrailRenderer);
     }
   
     private LabelDefinition makeLabelDefinition(String labelAttribute){
       // Create a new text symbol.
       TextSymbol labelTextSymbol  = new TextSymbol();
       labelTextSymbol.setColor(WHITE);
       labelTextSymbol.setSize(12.0f);
       labelTextSymbol.setHaloColor(RED);
       labelTextSymbol.setHaloWidth(1.0f);
       labelTextSymbol.setFontFamily("Arial");
       labelTextSymbol.setFontStyle(TextSymbol.FontStyle.ITALIC);
       labelTextSymbol.setFontWeight(TextSymbol.FontWeight.NORMAL);
   
       // Create a new Arcade label expression based on the field name.
       ArcadeLabelExpression labelExpression =
           new ArcadeLabelExpression("$feature." + labelAttribute);
   
       // Create and return the label definition.
       return new LabelDefinition(labelExpression, labelTextSymbol);
   
     }
   
     private void addTrailHeadsLayer() {
   
       // Create a trailheads feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trailheads);
   
       // Create a new picture marker symbol that uses the trailhead image.
       PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(trailheadImage);
       pictureMarkerSymbol.setHeight(18.0f);
       pictureMarkerSymbol.setWidth(18.0f);
   
   
       // Create a new simple renderer based on the picture marker symbol.
       SimpleRenderer simpleRenderer = new SimpleRenderer(pictureMarkerSymbol);
   
       // Set the feature layer's renderer, and enable labels.
       featureLayer.setRenderer(simpleRenderer);
       featureLayer.setLabelsEnabled(true);
   
       // Create the label definition.
       LabelDefinition trailHeadsDefinition = makeLabelDefinition("TRL_NAME");
   
       // Add the label definition to the layer's list of label definitions.
       featureLayer.getLabelDefinitions().add(trailHeadsDefinition);
   
     }
   
   }
   

   Show more lines

Import headers and define constants

You will add imports and define colors used in this tutorial.

1. In the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and click App. Add the following imports, replacing those from the Display a map tutorial.

   App.java

   Use dark colors for code blocks

                                                                                                                                                                                                                                                                                                                      

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   //   Copyright 2022 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.arcgisservices.LabelDefinition;
   import com.esri.arcgisruntime.data.ServiceFeatureTable;
   import com.esri.arcgisruntime.layers.FeatureLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.labeling.ArcadeLabelExpression;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer.ClassBreak;
   import com.esri.arcgisruntime.symbology.PictureMarkerSymbol;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleRenderer;
   import com.esri.arcgisruntime.symbology.TextSymbol;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer.UniqueValue;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class App extends Application {
   
     private MapView mapView;
   
     private ArcGISMap map =new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
     // colors for symbols
     private static final int RED = 0xFFFF0000;
     private static final int GREEN = 0xFF00FF00;
     private static final int BLUE = 0xFF0000FF;
     private static final int PURPLE = 0xFF800080;
     private static final int WHITE = 0xFFFFFFFF;
   
     // Application constants used to connect to data and resources.
     private final String parksAndOpenSpaces =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0";
     private final String trails =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0";
     private final String trailheads =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";
     private final String trailheadImage = "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png";
   
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
   
       // set the title and size of the stage and show it
       stage.setTitle("Style a feature layer");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEy";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0));
   
       addOpenSpaceLayer();
   
       addTrailsLayer();
   
       addBikeOnlyTrailsLayer();
   
       addNoBikesTrailsLayer();
   
       addTrailHeadsLayer();
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
     private FeatureLayer addFeatureLayer(String featureServiceUri){
       // Create a service feature table from a Uri.
       ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(featureServiceUri);
       // Create a feature layer from the service feature table.
       FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
       // Add the feature layer to the map's list of operational layers.
       map.getOperationalLayers().add(featureLayer);
       // return the feature layer
       return featureLayer;
     }
   
     private void addOpenSpaceLayer() {
       // Create a parks and open spaces feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(parksAndOpenSpaces);
   
       // Create fill symbols.
       SimpleFillSymbol purpleFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, PURPLE, null);
       SimpleFillSymbol greenFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, GREEN, null);
       SimpleFillSymbol blueFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, BLUE, null);
       SimpleFillSymbol redFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, RED, null);
   
       // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks.
       List<Object> naturalAreasValue = new ArrayList<>();
       naturalAreasValue.add("Natural Areas");
       UniqueValue naturalAreas =
           new UniqueValue("Natural Areas", "Natural Areas", purpleFillSymbol, naturalAreasValue);
   
       List<Object> regionalOpenSpaceValue = new ArrayList<>();
       naturalAreasValue.add("Regional Open Space");
       UniqueValue regionalOpenSpace =
           new UniqueValue("Regional Open Space", "Regional Open Space", greenFillSymbol, regionalOpenSpaceValue);
   
       List<Object> localParkValue = new ArrayList<>();
       localParkValue.add("Local Park");
       UniqueValue localPark =
           new UniqueValue("Local Park", "Local Park", blueFillSymbol, localParkValue);
   
       List<Object> regionalRecreationParkValue = new ArrayList<>();
       regionalRecreationParkValue.add("Regional Recreation Park");
       UniqueValue regionalRecreationPark =
           new UniqueValue("Regional Recreation Park", "Regional Recreation Park", redFillSymbol, regionalRecreationParkValue);
   
       List<UniqueValue> uniqueValuesList = new ArrayList<>();
       uniqueValuesList.add(naturalAreas);
       uniqueValuesList.add(regionalOpenSpace);
       uniqueValuesList.add(localPark);
       uniqueValuesList.add(regionalRecreationPark);
   
       // Create a unique value renderer and set it on the parks and open spaces feature layer.
       // fieldNames is a List, but in this tutorial there is only one item in the list
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("TYPE");
       UniqueValueRenderer openSpacesUniqueValueRenderer =
           new UniqueValueRenderer(fieldNames, uniqueValuesList, "Open Spaces", null);
       featureLayer.setRenderer(openSpacesUniqueValueRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.2f);
     }
   
     private void addTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Create simple line symbols.
       SimpleLineSymbol firstClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 3.0f);
       SimpleLineSymbol secondClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 4.0f);
       SimpleLineSymbol thirdClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 5.0f);
       SimpleLineSymbol fourthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 6.0f);
       SimpleLineSymbol fifthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 7.0f);
   
       // Create five class breaks.
       ClassBreak firstClassBreak =
           new ClassBreak("Under 500", "0 - 500", 0.0, 500.0, firstClassSymbol);
       ClassBreaksRenderer.ClassBreak secondClassBreak =
           new  ClassBreak("501 to 1000", "501 - 1000", 501.0, 1000.0, secondClassSymbol);
       ClassBreak thirdClassBreak =
           new  ClassBreak("1001 to 1500", "1001 - 1500", 1001.0, 1500.0, thirdClassSymbol);
       ClassBreak fourthClassBreak =
           new  ClassBreak("1501 to 2000", "1501 - 2000", 1501.0, 2000.0, fourthClassSymbol);
       ClassBreak fifthClassBreak =
           new ClassBreak("2001 to 2300", "2001 - 2300", 2001.0, 2300.0, fifthClassSymbol);
   
       List<ClassBreak> elevationBreaks = new ArrayList<>();
       elevationBreaks.add(firstClassBreak);
       elevationBreaks.add(secondClassBreak);
       elevationBreaks.add(thirdClassBreak);
       elevationBreaks.add(fourthClassBreak);
       elevationBreaks.add(fifthClassBreak);
   
       // Create a class breaks renderer and set it on the feature layer.
       ClassBreaksRenderer elevationClassBreaksRenderer =
           new ClassBreaksRenderer("ELEV_GAIN", elevationBreaks);
       featureLayer.setRenderer(elevationClassBreaksRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.75f);
   
     }
   
     private void addBikeOnlyTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'Yes'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol bikeTrailSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, BLUE, 2.0f);
       SimpleRenderer bikeTrailRenderer = new SimpleRenderer(bikeTrailSymbol);
       featureLayer.setRenderer(bikeTrailRenderer);
   
     }
   
     private void addNoBikesTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that don't permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'No'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol noBikeTrailSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, RED, 2.0f);
       SimpleRenderer noBikeTrailRenderer =
           new SimpleRenderer(noBikeTrailSymbol);
       featureLayer.setRenderer(noBikeTrailRenderer);
     }
   
     private LabelDefinition makeLabelDefinition(String labelAttribute){
       // Create a new text symbol.
       TextSymbol labelTextSymbol  = new TextSymbol();
       labelTextSymbol.setColor(WHITE);
       labelTextSymbol.setSize(12.0f);
       labelTextSymbol.setHaloColor(RED);
       labelTextSymbol.setHaloWidth(1.0f);
       labelTextSymbol.setFontFamily("Arial");
       labelTextSymbol.setFontStyle(TextSymbol.FontStyle.ITALIC);
       labelTextSymbol.setFontWeight(TextSymbol.FontWeight.NORMAL);
   
       // Create a new Arcade label expression based on the field name.
       ArcadeLabelExpression labelExpression =
           new ArcadeLabelExpression("$feature." + labelAttribute);
   
       // Create and return the label definition.
       return new LabelDefinition(labelExpression, labelTextSymbol);
   
     }
   
     private void addTrailHeadsLayer() {
   
       // Create a trailheads feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trailheads);
   
       // Create a new picture marker symbol that uses the trailhead image.
       PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(trailheadImage);
       pictureMarkerSymbol.setHeight(18.0f);
       pictureMarkerSymbol.setWidth(18.0f);
   
   
       // Create a new simple renderer based on the picture marker symbol.
       SimpleRenderer simpleRenderer = new SimpleRenderer(pictureMarkerSymbol);
   
       // Set the feature layer's renderer, and enable labels.
       featureLayer.setRenderer(simpleRenderer);
       featureLayer.setLabelsEnabled(true);
   
       // Create the label definition.
       LabelDefinition trailHeadsDefinition = makeLabelDefinition("TRL_NAME");
   
       // Add the label definition to the layer's list of label definitions.
       featureLayer.getLabelDefinitions().add(trailHeadsDefinition);
   
     }
   
   }
   

2. Add static fields to hold the RGB hex value of certain colors. These are the colors you will be assigning to symbols.

   App.java

   Use dark colors for code blocks

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   //   Copyright 2022 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.
   
   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.arcgisservices.LabelDefinition;
   import com.esri.arcgisruntime.data.ServiceFeatureTable;
   import com.esri.arcgisruntime.layers.FeatureLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.labeling.ArcadeLabelExpression;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer;
   import com.esri.arcgisruntime.symbology.ClassBreaksRenderer.ClassBreak;
   import com.esri.arcgisruntime.symbology.PictureMarkerSymbol;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleRenderer;
   import com.esri.arcgisruntime.symbology.TextSymbol;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer;
   import com.esri.arcgisruntime.symbology.UniqueValueRenderer.UniqueValue;
   
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import java.util.ArrayList;
   import java.util.List;
   
   public class App extends Application {
   
     private MapView mapView;
   
     private ArcGISMap map =new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
     // colors for symbols
     private static final int RED = 0xFFFF0000;
     private static final int GREEN = 0xFF00FF00;
     private static final int BLUE = 0xFF0000FF;
     private static final int PURPLE = 0xFF800080;
     private static final int WHITE = 0xFFFFFFFF;
   
     // Application constants used to connect to data and resources.
     private final String parksAndOpenSpaces =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0";
     private final String trails =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0";
     private final String trailheads =
         "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";
     private final String trailheadImage = "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png";
   
   
     public static void main(String[] args) {
       Application.launch(args);
     }
   
     @Override
     public void start(Stage stage) {
   
       // set the title and size of the stage and show it
       stage.setTitle("Style a feature layer");
   
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEy";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   
       // create a map view to display the map and add it to the stack pane
       mapView = new MapView();
       stackPane.getChildren().add(mapView);
   
       map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
       // set the map on the map view
       mapView.setMap(map);
   
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0));
   
       addOpenSpaceLayer();
   
       addTrailsLayer();
   
       addBikeOnlyTrailsLayer();
   
       addNoBikesTrailsLayer();
   
       addTrailHeadsLayer();
   
     }
   
     /**
      * Stops and releases all resources used in application.
      */
     @Override
     public void stop() {
       if (mapView != null) {
         mapView.dispose();
       }
     }
   
     private FeatureLayer addFeatureLayer(String featureServiceUri){
       // Create a service feature table from a Uri.
       ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(featureServiceUri);
       // Create a feature layer from the service feature table.
       FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);
       // Add the feature layer to the map's list of operational layers.
       map.getOperationalLayers().add(featureLayer);
       // return the feature layer
       return featureLayer;
     }
   
     private void addOpenSpaceLayer() {
       // Create a parks and open spaces feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(parksAndOpenSpaces);
   
       // Create fill symbols.
       SimpleFillSymbol purpleFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, PURPLE, null);
       SimpleFillSymbol greenFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, GREEN, null);
       SimpleFillSymbol blueFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, BLUE, null);
       SimpleFillSymbol redFillSymbol =
           new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, RED, null);
   
       // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks.
       List<Object> naturalAreasValue = new ArrayList<>();
       naturalAreasValue.add("Natural Areas");
       UniqueValue naturalAreas =
           new UniqueValue("Natural Areas", "Natural Areas", purpleFillSymbol, naturalAreasValue);
   
       List<Object> regionalOpenSpaceValue = new ArrayList<>();
       naturalAreasValue.add("Regional Open Space");
       UniqueValue regionalOpenSpace =
           new UniqueValue("Regional Open Space", "Regional Open Space", greenFillSymbol, regionalOpenSpaceValue);
   
       List<Object> localParkValue = new ArrayList<>();
       localParkValue.add("Local Park");
       UniqueValue localPark =
           new UniqueValue("Local Park", "Local Park", blueFillSymbol, localParkValue);
   
       List<Object> regionalRecreationParkValue = new ArrayList<>();
       regionalRecreationParkValue.add("Regional Recreation Park");
       UniqueValue regionalRecreationPark =
           new UniqueValue("Regional Recreation Park", "Regional Recreation Park", redFillSymbol, regionalRecreationParkValue);
   
       List<UniqueValue> uniqueValuesList = new ArrayList<>();
       uniqueValuesList.add(naturalAreas);
       uniqueValuesList.add(regionalOpenSpace);
       uniqueValuesList.add(localPark);
       uniqueValuesList.add(regionalRecreationPark);
   
       // Create a unique value renderer and set it on the parks and open spaces feature layer.
       // fieldNames is a List, but in this tutorial there is only one item in the list
       List<String> fieldNames = new ArrayList<>();
       fieldNames.add("TYPE");
       UniqueValueRenderer openSpacesUniqueValueRenderer =
           new UniqueValueRenderer(fieldNames, uniqueValuesList, "Open Spaces", null);
       featureLayer.setRenderer(openSpacesUniqueValueRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.2f);
     }
   
     private void addTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Create simple line symbols.
       SimpleLineSymbol firstClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 3.0f);
       SimpleLineSymbol secondClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 4.0f);
       SimpleLineSymbol thirdClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 5.0f);
       SimpleLineSymbol fourthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 6.0f);
       SimpleLineSymbol fifthClassSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, PURPLE, 7.0f);
   
       // Create five class breaks.
       ClassBreak firstClassBreak =
           new ClassBreak("Under 500", "0 - 500", 0.0, 500.0, firstClassSymbol);
       ClassBreaksRenderer.ClassBreak secondClassBreak =
           new  ClassBreak("501 to 1000", "501 - 1000", 501.0, 1000.0, secondClassSymbol);
       ClassBreak thirdClassBreak =
           new  ClassBreak("1001 to 1500", "1001 - 1500", 1001.0, 1500.0, thirdClassSymbol);
       ClassBreak fourthClassBreak =
           new  ClassBreak("1501 to 2000", "1501 - 2000", 1501.0, 2000.0, fourthClassSymbol);
       ClassBreak fifthClassBreak =
           new ClassBreak("2001 to 2300", "2001 - 2300", 2001.0, 2300.0, fifthClassSymbol);
   
       List<ClassBreak> elevationBreaks = new ArrayList<>();
       elevationBreaks.add(firstClassBreak);
       elevationBreaks.add(secondClassBreak);
       elevationBreaks.add(thirdClassBreak);
       elevationBreaks.add(fourthClassBreak);
       elevationBreaks.add(fifthClassBreak);
   
       // Create a class breaks renderer and set it on the feature layer.
       ClassBreaksRenderer elevationClassBreaksRenderer =
           new ClassBreaksRenderer("ELEV_GAIN", elevationBreaks);
       featureLayer.setRenderer(elevationClassBreaksRenderer);
   
       // Set the layer opacity to semi-transparent.
       featureLayer.setOpacity(0.75f);
   
     }
   
     private void addBikeOnlyTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'Yes'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol bikeTrailSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, BLUE, 2.0f);
       SimpleRenderer bikeTrailRenderer = new SimpleRenderer(bikeTrailSymbol);
       featureLayer.setRenderer(bikeTrailRenderer);
   
     }
   
     private void addNoBikesTrailsLayer() {
       // Create a trails feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trails);
   
       // Write a definition expression to filter for trails that don't permit the use of bikes.
       featureLayer.setDefinitionExpression("USE_BIKE = 'No'");
   
       // Create a simple renderer and set it on the feature layer.
       SimpleLineSymbol noBikeTrailSymbol =
           new SimpleLineSymbol(SimpleLineSymbol.Style.DOT, RED, 2.0f);
       SimpleRenderer noBikeTrailRenderer =
           new SimpleRenderer(noBikeTrailSymbol);
       featureLayer.setRenderer(noBikeTrailRenderer);
     }
   
     private LabelDefinition makeLabelDefinition(String labelAttribute){
       // Create a new text symbol.
       TextSymbol labelTextSymbol  = new TextSymbol();
       labelTextSymbol.setColor(WHITE);
       labelTextSymbol.setSize(12.0f);
       labelTextSymbol.setHaloColor(RED);
       labelTextSymbol.setHaloWidth(1.0f);
       labelTextSymbol.setFontFamily("Arial");
       labelTextSymbol.setFontStyle(TextSymbol.FontStyle.ITALIC);
       labelTextSymbol.setFontWeight(TextSymbol.FontWeight.NORMAL);
   
       // Create a new Arcade label expression based on the field name.
       ArcadeLabelExpression labelExpression =
           new ArcadeLabelExpression("$feature." + labelAttribute);
   
       // Create and return the label definition.
       return new LabelDefinition(labelExpression, labelTextSymbol);
   
     }
   
     private void addTrailHeadsLayer() {
   
       // Create a trailheads feature layer and add it to the map view.
       FeatureLayer featureLayer = addFeatureLayer(trailheads);
   
       // Create a new picture marker symbol that uses the trailhead image.
       PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(trailheadImage);
       pictureMarkerSymbol.setHeight(18.0f);
       pictureMarkerSymbol.setWidth(18.0f);
   
   
       // Create a new simple renderer based on the picture marker symbol.
       SimpleRenderer simpleRenderer = new SimpleRenderer(pictureMarkerSymbol);
   
       // Set the feature layer's renderer, and enable labels.
       featureLayer.setRenderer(simpleRenderer);
       featureLayer.setLabelsEnabled(true);
   
       // Create the label definition.
       LabelDefinition trailHeadsDefinition = makeLabelDefinition("TRL_NAME");
   
       // Add the label definition to the layer's list of label definitions.
       featureLayer.getLabelDefinitions().add(trailHeadsDefinition);
   
     }
   
   }
   

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