Style a feature layer

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

style a feature layer

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.

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

The following are required for this tutorial:

  1. An ArcGIS account to access API keys. If you don't have an account, sign up for free.
  2. A development and deployment environment that meets the system requirements.
  3. An IDE for Android development in Kotlin.

Steps

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

  2. Modify the old project for use in this new tutorial. Expand More info for instructions.

  3. Set your API key in MainActivity.kt.

Add import statements

In the Android tool window, open app > kotlin+java > com.example.app > MainScreen.kt. Replace the import statements with the imports needed for this tutorial.

MainScreen.kt
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@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import com.arcgismaps.Color
import com.arcgismaps.data.ServiceFeatureTable
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.labeling.ArcadeLabelExpression
import com.arcgismaps.mapping.labeling.LabelDefinition
import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.mapping.symbology.ClassBreak
import com.arcgismaps.mapping.symbology.ClassBreaksRenderer
import com.arcgismaps.mapping.symbology.FontStyle
import com.arcgismaps.mapping.symbology.FontWeight
import com.arcgismaps.mapping.symbology.PictureMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleRenderer
import com.arcgismaps.mapping.symbology.TextSymbol
import com.arcgismaps.mapping.symbology.UniqueValue
import com.arcgismaps.mapping.symbology.UniqueValueRenderer
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.example.app.R

Create a function to add a feature layer

You can add a feature layer from a feature service hosted in ArcGIS. Each feature layer contains features with a single geometry type (point, line, or polygon), and a set of attributes. Once added to the map, feature layers can be symbolized, styled, and labeled in a variety of ways.

Define variables that store feature service URLs used by the app's layers, and then create a helper function to add a layer to the map's list of operational layers. You will use this code throughout the tutorial as you add and symbolize various layers.

  1. In createMap() add four read-only String variables: three for accessing feature layers, and a fourth for accessing a static image for use in a picture marker symbol. You will use these resources in future steps.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val parksAndOpenSpaces =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0"
        val trails =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0"
        val trailheads =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0"
        val trailheadImage =
            "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png"
    
        return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
            initialViewpoint = Viewpoint(
                latitude = 34.0270,
                longitude = -118.8050,
                scale = 72000.0
            )
    
        }
    }
    
    Expand
  2. In the apply block for ArcGISMap, insert code that adds FeatureLayers to the map's operationalLayers. For now, the listOf() function has no parameters. In this tutorial, you will be adding each new feature layer to the list of parameters.

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val parksAndOpenSpaces =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0"
        val trails =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0"
        val trailheads =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0"
        val trailheadImage =
            "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png"
    
        return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
            initialViewpoint = Viewpoint(
                latitude = 34.0270,
                longitude = -118.8050,
                scale = 72000.0
            )
    
            operationalLayers.addAll(
    
                listOf(
    
                )
    
            )
    
        }
    }
    
    Expand
  3. Add a top-level helper function named createFeatureLayer() that takes a feature service URI as an argument and returns a FeatureLayer created from the URI.

    MainScreen.kt
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    fun createFeatureLayer(featureServiceUri: String): FeatureLayer {
        // Create a service feature table from a Uri
        val serviceFeatureTable = ServiceFeatureTable(featureServiceUri)
        // Return a feature layer created from the service feature table
        return FeatureLayer.createWithFeatureTable(serviceFeatureTable)
    }
    
    Expand

Add a layer with a unique value renderer

Create a method to apply a different symbol for each type of park area to the Parks and Open Spaces feature layer.

  1. Add a top-level function named createOpenSpaceLayer().

    MainScreen.kt
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    fun createOpenSpaceLayer(featureServiceUri: String): FeatureLayer {
        // Create fill symbol objects to represent the parks and open spaces layer
        val magentaFillSymbol = SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.fromRgba(255, 0, 255), null)
        val greenFillSymbol = SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.green, null)
        val blueFillSymbol = SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.fromRgba(0, 0, 255), null)
        val redFillSymbol = SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.red, null)
    
        // Create a unique value for natural areas, regional open spaces, local parks, and regional recreation parks
        val naturalAreas = UniqueValue(
            description = "Natural Areas",
            label = "Natural Areas",
            symbol = magentaFillSymbol,
            values = listOf("Natural Areas")
        )
        val regionalOpenSpace = UniqueValue(
            description = "Regional Open Space",
            label = "Regional Open Space",
            symbol = greenFillSymbol,
            values = listOf("Regional Open Space")
        )
        val localPark = UniqueValue(
            description = "Local Park",
            label = "Local Park",
            symbol = blueFillSymbol,
            values = listOf("Local Park")
        )
        val regionalRecreationPark = UniqueValue(
            description = "Regional Recreation Park",
            label = "Regional Recreation Park",
            symbol = redFillSymbol,
            values = listOf("Regional Recreation Park")
        )
        // Create a unique value list with the fill symbols
        val uniqueValuesList = listOf(
            naturalAreas,
            regionalOpenSpace,
            localPark,
            regionalRecreationPark
        )
    
        // Create and assign a unique value renderer to the feature layer
        val openSpacesUniqueValueRenderer =
            UniqueValueRenderer(
                fieldNames = listOf("TYPE"),
                uniqueValues = uniqueValuesList,
                defaultLabel = "Open Spaces",
                defaultSymbol = null
            )
    
        // Create a parks and open spaces feature layer
        val featureLayer = createFeatureLayer(featureServiceUri).apply {
            // Style the feature layer using the unique value renderer
            renderer = openSpacesUniqueValueRenderer
            // Set the layer opacity to semi-transparent
            opacity = 0.2f
        }
    
        return featureLayer
    }
    
    Expand
  2. In createMap(), add the Parks and Open Space feature layer to the map's operational layers by calling createOpenSpaceLayer().

    MainScreen.kt
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    fun createMap(): ArcGISMap {
    
        val parksAndOpenSpaces =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0"
        val trails =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0"
        val trailheads =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0"
        val trailheadImage =
            "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png"
    
        return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
            initialViewpoint = Viewpoint(
                latitude = 34.0270,
                longitude = -118.8050,
                scale = 72000.0
            )
    
            operationalLayers.addAll(
    
                listOf(
    
                    createOpenSpaceLayer(parksAndOpenSpaces),
    
                )
    
            )
    
        }
    }
    
    Expand
  3. Click Run > Run > app to run the app.

When the app opens, Parks and Open Spaces feature layer is added to the map. The map displays the different types of parks and open spaces with four unique symbols.

Add a layer with a class breaks renderer

Create a method to apply a different symbol for each of the five ranges of elevation gain to the Trails feature layer.

  1. Add a top-level function named createTrailsLayer().

    MainScreen.kt
    Expand
    Use dark colors for code blocks
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    fun createTrailsLayer(featureServiceUri: String): FeatureLayer {
        // Create simple symbol objects to represent the trails layer
        val firstClassSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(255, 0, 255), 3.0f)
        val secondClassSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(255, 0, 255), 4.0f)
        val thirdClassSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(255, 0, 255), 5.0f)
        val fourthClassSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(255, 0, 255), 6.0f)
        val fifthClassSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(255, 0, 255), 7.0f)
    
        // Create 5 class breaks
        val firstClassBreak = ClassBreak(
            description = "Under 500",
            label = "0 - 500",
            minValue = 0.0,
            maxValue = 500.0,
            symbol = firstClassSymbol
        )
        val secondClassBreak = ClassBreak(
            description = "501 to 1000",
            label = "501 - 1000",
            minValue = 501.0,
            maxValue = 1000.0,
            symbol = secondClassSymbol
        )
        val thirdClassBreak = ClassBreak(
            description = "1001 to 1500",
            label = "1001 - 1500",
            minValue = 1001.0,
            maxValue = 1500.0,
            symbol = thirdClassSymbol
        )
        val fourthClassBreak = ClassBreak(
            description = "1501 to 2000",
            label = "1501 - 2000",
            minValue = 1501.0,
            maxValue = 2000.0,
            symbol = fourthClassSymbol
        )
        val fifthClassBreak = ClassBreak(
            description = "2001 to 2300",
            label = "2001 - 2300",
            minValue = 2001.0,
            maxValue = 2300.0,
            symbol = fifthClassSymbol
        )
        val elevationBreaks = listOf(
            firstClassBreak,
            secondClassBreak,
            thirdClassBreak,
            fourthClassBreak,
            fifthClassBreak
        )
    
        // Create and assign a class breaks renderer to the feature layer
        val elevationClassBreaksRenderer = ClassBreaksRenderer("ELEV_GAIN", elevationBreaks)
    
        // Create a trails feature layer
        val featureLayer = createFeatureLayer(featureServiceUri).apply {
            // Style the feature layer using the class breaks renderer
            renderer = elevationClassBreaksRenderer
            // Set the layer opacity to semi-transparent
            opacity = 0.75f
        }
    
        return featureLayer
    }
    
    Expand
  2. Update createMap() to call the new createTrailsLayer() function.

    MainScreen.kt
    Expand
    Use dark colors for code blocks
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    fun createMap(): ArcGISMap {
    
        val parksAndOpenSpaces =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0"
        val trails =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0"
        val trailheads =
            "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0"
        val trailheadImage =
            "https://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png"
    
        return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
            initialViewpoint = Viewpoint(
                latitude = 34.0270,
                longitude = -118.8050,
                scale = 72000.0
            )
    
            operationalLayers.addAll(
    
                listOf(
    
                    createOpenSpaceLayer(parksAndOpenSpaces),
    
                    createTrailsLayer(trails),
    
                )
    
            )
    
        }
    }
    
    Expand
  3. Click Run > Run > app to run the app.

When the app opens, the Trails feature layer is added to the map. The map displays trails with different symbols depending on trail elevation.

Add layers with definition expressions

You can use a definition expression to define a subset of features to display. Features that do not meet the expression criteria are not displayed by the layer. In the following steps, you will create two methods that use a definition expression to apply a symbol to a subset of features in the Trails feature layer.

  1. Add a top-level function named createBikeOnlyTrailsLayer() that uses a definitionExpression to filter for trails that permit bikes.

    MainScreen.kt
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    fun createBikeOnlyTrailsLayer(featureServiceUri: String): FeatureLayer {
        // Create blue dot style simple line symbol to represent the bike trails
        val bikeTrailSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Dot, Color.fromRgba(0, 0, 255), 2.0f)
        // Create a simple renderer for the feature layer
        val bikeTrailRenderer = SimpleRenderer(bikeTrailSymbol)
    
        // Create a bike trails feature layer
        val featureLayer = createFeatureLayer(featureServiceUri).apply {
            // Style the feature layer using the simple renderer
            renderer = bikeTrailRenderer
            // Write a definition expression to filter for trails that permit the use of bikes
            definitionExpression = "USE_BIKE = 'Yes'"
        }
    
        return featureLayer
    }
    
    Expand
  2. Add another top-level function named createNoBikeTrailsLayer() with a definition expression to filter for trails that don't allow bikes.

    MainScreen.kt
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