Change the appearance of a feature layer with a renderer.
Use case
A feature layer hosted on ArcGIS Online has a preset renderer and will display in an application with that renderer. However, for example, the color associated with the original renderer may be unsuitable for a company with staff or clients who are color blind, or for presentation with a different set of basemap and operational layers. In these cases, the renderer on the feature layer's data can be set to a more suitable color.
How to use the sample
Use the button to change the renderer on the feature layer. The original renderer displays orange circles, the diameters of which are proportional to carbon storage of each tree. When the simple renderer is applied, it displays the location of the trees simply as points with random color.
How it works
- Create a
FeatureLayerfrom a portal item. - Create a new
SimpleRenderer. - Change the feature layer's renderer.
Relevant API
- FeatureLayer
- SimpleRenderer
About the data
This sample displays a Landscape Trees feature layer in Warren Wilson College, North Carolina, showing carbon storage of trees on campus. The size of each circle is proportional to that particular tree's carbon storage total.
Tags
feature layer, renderer, visualization
Sample Code
/* Copyright 2025 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.esri.arcgismaps.sample.applysimplerenderertofeaturelayer.components import android.app.Application import androidx.lifecycle.AndroidViewModel import androidx.lifecycle.viewModelScope import com.arcgismaps.Color import com.arcgismaps.mapping.ArcGISMap import com.arcgismaps.mapping.BasemapStyle import com.arcgismaps.mapping.PortalItem import com.arcgismaps.mapping.Viewpoint import com.arcgismaps.mapping.layers.FeatureLayer import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle import com.arcgismaps.mapping.symbology.SimpleRenderer import com.arcgismaps.portal.Portal import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel import kotlinx.coroutines.launch import kotlin.random.Random class ApplySimpleRendererToFeatureLayerViewModel(app: Application) : AndroidViewModel(app) { // The feature layer from the portal item to which we will apply the renderer var featureLayer: FeatureLayer = FeatureLayer.createWithItem( PortalItem( portal = Portal.arcGISOnline(connection = Portal.Connection.Anonymous), itemId = "6d41340931544829acc8f68c27e69dec" ) ) // The ArcGISMap instance with the basemap and initial viewpoint var arcGISMap = ArcGISMap(BasemapStyle.ArcGISTopographic).apply { initialViewpoint = Viewpoint(latitude = 35.61, longitude = -82.44, scale = 1e4) operationalLayers.add(featureLayer) } // Create a message dialog view model for handling error messages val messageDialogVM = MessageDialogViewModel() init { viewModelScope.launch { arcGISMap.load().onFailure { messageDialogVM.showMessageDialog(it) } } } /** * Applies a simple renderer with a random color to the feature layer. */ fun applyRandomSimpleRenderer() { // Pick a random color from the list val colorList = listOf(Color.red, Color.yellow, Color.blue, Color.green) val randomColor = colorList[Random.nextInt(colorList.size)] // Create a simple marker symbol val symbol = SimpleMarkerSymbol( style = SimpleMarkerSymbolStyle.Circle, color = randomColor, size = 10f ) // Create and apply the simple renderer val renderer = SimpleRenderer(symbol) featureLayer.renderer = renderer } } // Extension property to provide blue color for ArcGISMaps Color class val Color.Companion.blue: Color get() = fromRgba(0, 0, 255, 255)