Add feature collection layer from table | ArcGIS Maps SDK for Kotlin

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Create a Feature Collection Layer from a Feature Collection Table, and add it to a map.

Image of add feature collection layer from table

Use case

A Feature Collection allows easily importing external data (such as CSV files), as well as creating custom schema for data that is in non-standardized format. This data can then be used to populate a Feature Collection Table, and displayed in a Feature Collection Layer using the attributes and geometries provided in the external data source. For example, an electricity supplier could use this functionality to visualize existing location data of coverage areas (polygons), power stations (points), transmission lines (polylines), and others.

How to use the sample

When launched, this sample displays a FeatureCollectionLayer with a Point, Polyline and Polygon geometry. Pan and zoom to explore the scene.

How it works

Create a FeatureCollectionLayer using a new feature collection, FeatureCollectionLayer(featureCollection)
Add the feature collection layer to the map, ArcGISMap.operationalLayers.add(featureCollectionLayer).
Create a FeatureCollectionTable for the GeometryTypes Point, Polyline, and Polygon, FeatureCollectionTable(fields, geometryType, spatialReference)
Additionally, pass in a list of Field objects to represent the table’s schema. In this case a field of type String named name is added.
Assign a SimpleRenderer to each table to render any Features from that table using the Symbol that was set.
Add all the feature collection tables to the feature collection, FeatureCollection(featureCollectionTables = listOf(points, lines, polygons)).
Use the createFeature method to create a feature from the feature collection table, passing an attribute and geometry for that feature, FeatureCollectionTable.createFeature(attributes, geometry).
Add new features to the table, FeatureCollectionTable.addFeature(feature).

Relevant API

Feature
FeatureCollection
FeatureCollectionLayer
FeatureCollectionTable
Field
SimpleRenderer

Sample Code

MainActivity.kt

AddFeatureCollectionLayerFromTableViewModel.kt

AddFeatureCollectionLayerFromTableScreen.kt

/* 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.addfeaturecollectionlayerfromtable

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.addfeaturecollectionlayerfromtable.screens.AddFeatureCollectionLayerFromTableScreen

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.ACCESS_TOKEN)

        setContent {
            SampleAppTheme {
                AddFeatureCollectionLayerFromTableApp()
            }
        }
    }

    @Composable
    private fun AddFeatureCollectionLayerFromTableApp() {
        Surface(color = MaterialTheme.colorScheme.background) {
            AddFeatureCollectionLayerFromTableScreen(
                sampleName = getString(R.string.add_feature_collection_layer_from_table_app_name)
            )
        }
    }
}

/* 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.addfeaturecollectionlayerfromtable.components

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.Color
import com.arcgismaps.data.FeatureCollection
import com.arcgismaps.data.FeatureCollectionTable
import com.arcgismaps.data.Field
import com.arcgismaps.data.FieldType
import com.arcgismaps.geometry.GeometryType
import com.arcgismaps.geometry.Polygon
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.Polyline
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.layers.FeatureCollectionLayer
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.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleRenderer
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.launch

/**
 * ViewModel which creates three in-memory FeatureCollectionTables (point, polyline, polygon),
 * adds features to them, creates a FeatureCollection and displays it on the map as a
 * FeatureCollectionLayer.
 */
class AddFeatureCollectionLayerFromTableViewModel(app: Application) : AndroidViewModel(app) {

    // ArcGIS map exposed for Compose screen.
    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISOceans).apply {
        initialViewpoint = Viewpoint(latitude = 8.849289, longitude = -79.497238, scale = 1e6)
    }

    // Message dialog view model for error handling
    val messageDialogVM = MessageDialogViewModel()

    init {
        // Load the map and then build the feature collection layer
        viewModelScope.launch {
            createAndAddFeatureCollectionLayer()
            arcGISMap.load()
                .onFailure { messageDialogVM.showMessageDialog(it) }
        }
    }

    private suspend fun createAndAddFeatureCollectionLayer() {

        // Create each feature collection table
        val pointsTable = createPointsCollectionTable()
        val linesTable = createLinesCollectionTable()
        val polygonsTable = createPolygonsCollectionTable()

        // Create a FeatureCollection from the tables
        val featureCollection = FeatureCollection(featureCollectionTables = listOf(pointsTable, linesTable, polygonsTable))

        // Create a layer from the feature collection and add it to the map
        val featureCollectionLayer = FeatureCollectionLayer(featureCollection = featureCollection)
        arcGISMap.operationalLayers.add(featureCollectionLayer)
    }

    /**
     * Create an in-memory points [FeatureCollectionTable], define a simple schema and renderer,
     * add a single point feature and return the table.
     */
    private suspend fun createPointsCollectionTable(): FeatureCollectionTable {

        // Define a simple text field for a place name
        val placeField = Field(
            fieldType = FieldType.Text,
            name = "Place",
            alias = "Place name",
            length = 40,
            isEditable = true,
            isNullable = false
        )

        // Create the feature collection table for points using WGS84 spatial reference
        val pointsCollectionTable = FeatureCollectionTable(
            fields = listOf(placeField),
            geometryType = GeometryType.Point,
            spatialReference = SpatialReference.wgs84()
        )

        // Set a simple renderer using a triangle marker symbol
        pointsCollectionTable.renderer = SimpleRenderer(
            symbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Triangle,
                color = Color.red,
                size = 18f
            )
        )

        // Create a point geometry (x = longitude, y = latitude) and a feature with attributes
        val pointGeometry = Point(x = -79.497238, y = 8.849289, spatialReference = SpatialReference.wgs84())
        val placeAttributes = mapOf("Place" to "Current location")

        // Create and add the feature to the table
        val pointFeature = pointsCollectionTable.createFeature(placeAttributes, pointGeometry)
        pointsCollectionTable.addFeature(pointFeature).onFailure { messageDialogVM.showMessageDialog(it) }

        return pointsCollectionTable
    }

    /**
     * Create an in-memory polyline FeatureCollectionTable with a dash renderer and a single line
     * feature between two points.
     */
    private suspend fun createLinesCollectionTable(): FeatureCollectionTable {
        val boundaryField = Field(
            fieldType = FieldType.Text,
            name = "Boundary",
            alias = "Boundary name",
            length = 40,
            isEditable = true,
            isNullable = false
        )

        val linesCollectionTable = FeatureCollectionTable(
            fields = listOf(boundaryField),
            geometryType = GeometryType.Polyline,
            spatialReference = SpatialReference.wgs84()
        )

        linesCollectionTable.renderer = SimpleRenderer(
            symbol = SimpleLineSymbol(
                style = SimpleLineSymbolStyle.Dash,
                color = Color.green,
                width = 3f
            )
        )

        val lineGeometry = Polyline(
            points = listOf(
                Point(x = -79.497238, y = 8.849289, spatialReference = SpatialReference.wgs84()),
                Point(x = -80.035568, y = 9.432302, spatialReference = SpatialReference.wgs84())
            )
        )

        val lineAttributes = mapOf("Boundary" to "AManAPlanACanalPanama")
        val lineFeature = linesCollectionTable.createFeature(lineAttributes, lineGeometry)
        linesCollectionTable.addFeature(lineFeature).onFailure { messageDialogVM.showMessageDialog(it) }

        return linesCollectionTable
    }

    /**
     * Create an in-memory polygon and add it to the FeatureCollectionTable as a single polygon feature.
     * A simple fill renderer is added to the FeatureCollectionTable to render the polygon.
     */
    private suspend fun createPolygonsCollectionTable(): FeatureCollectionTable {
        val areaField = Field(
            fieldType = FieldType.Text,
            name = "Area",
            alias = "Area name",
            length = 40,
            isEditable = true,
            isNullable = false
        )

        val polygonsCollectionTable = FeatureCollectionTable(
            fields = listOf(areaField),
            geometryType = GeometryType.Polygon,
            spatialReference = SpatialReference.wgs84()
        )

        // Create a simple fill symbol using a blue outline and cyan diagonal cross fill
        val outlineSymbol = SimpleLineSymbol(
            style = SimpleLineSymbolStyle.Solid,
            color = Color.blue,
            width = 2f
        )
        val fillSymbol = SimpleFillSymbol(
            style = SimpleFillSymbolStyle.DiagonalCross,
            color = Color.cyan,
            outline = outlineSymbol
        )
        polygonsCollectionTable.renderer = SimpleRenderer(symbol = fillSymbol)

        val polygonGeometry = Polygon(points = listOf(
            Point(x = -79.497238, y = 8.849289, spatialReference = SpatialReference.wgs84()),
            Point(x = -79.337936, y = 8.638903, spatialReference = SpatialReference.wgs84()),
            Point(x = -79.11409, y = 8.895422, spatialReference = SpatialReference.wgs84())
        ))

        val polygonAttributes = mapOf("Area" to "Restricted area")
        val polygonFeature = polygonsCollectionTable.createFeature(polygonAttributes, polygonGeometry)
        polygonsCollectionTable.addFeature(polygonFeature).onFailure { messageDialogVM.showMessageDialog(it) }

        return polygonsCollectionTable
    }
}

/* 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.addfeaturecollectionlayerfromtable.screens

import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Scaffold
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.esri.arcgismaps.sample.addfeaturecollectionlayerfromtable.components.AddFeatureCollectionLayerFromTableViewModel
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialog
import com.esri.arcgismaps.sample.sampleslib.components.SampleTopAppBar

/**
 * Main screen layout for the sample.
 * Displays a MapView and relies on the ViewModel to create the feature collection layer.
 */
@Composable
fun AddFeatureCollectionLayerFromTableScreen(sampleName: String) {
    val mapViewModel: AddFeatureCollectionLayerFromTableViewModel = viewModel()

    Scaffold(
        topBar = { SampleTopAppBar(title = sampleName) },
        content = { paddingValues ->
            // MapView displays the map created/managed by the ViewModel.
            MapView(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(paddingValues),
                arcGISMap = mapViewModel.arcGISMap
            )
            // Display any error messages surfaced by the ViewModel
            mapViewModel.messageDialogVM.apply {
                if (dialogStatus) {
                    MessageDialog(
                        title = messageTitle,
                        description = messageDescription,
                        onDismissRequest = ::dismissDialog
                    )
                }
            }
        }
    )
}

Use case

How to use the sample

How it works

Relevant API

Tags

Sample Code