Add a feature layer
Learn how to use a URL to access and display a feature layer in a map.
A feature layer is a visual representation of feature table data. Feature layers contain features with a geometry type (point, line, or polygon), and attributes. You can use feature layers to store, access, and manage large amounts of geographic data for your applications. You can access features from a feature layer using its underlying feature table.
In this tutorial, you use a URL to create, access, and display a feature layer in your app by first creating a local feature table from an ArcGIS Online service: Trailheads (points).
Prerequisites
The following are required for this tutorial:
- An ArcGIS account to access API keys. If you don't have an account, sign up for free.
- Confirm that your system meets the system requirements.
- An IDE for Android development in Kotlin.
Steps
Open an Android Studio project
To start this tutorial, complete the Display a map tutorial. Or download and unzip the Display a map solution in a new folder.
Modify the old project for use in this new tutorial. Expand More info for instructions.
On your file system, delete the .idea folder, if present, at the top level of your project.
In the Android tool window, open app > res > values > strings.xml.
In the
<string name="app_name">
element, change the text content to Add a feature layer.strings.xmlUse dark colors for code blocks 1 2 3 4 5Change line 1 2 3 4 5
<resources> <string name="app_name">Add a feature layer</string> </resources>In the Android tool window, open Gradle Scripts > settings.gradle.
Change the value of
rootProject.name
to "Add a feature layer".settings.gradleUse dark colors for code blocks 1 2 3Change line 1 2 3
include ':app' rootProject.name = "Add a feature layer"Click File > Sync Project with Gradle files. Android Studio will recognize your changes and create a new .idea folder.
If you downloaded the solution project, set your API key.
An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.
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.
In Android Studio: in the Android tool window, open app > java > com.example.app > MainActivity.
In the
setApiKeyForApp()
method, find theArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
call and paste your API key inside the quotes, replacing YOUR_API_KEY.MainActivity.ktUse dark colors for code blocks Change line 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
/* * 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 * * https://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 android.os.Bundle import androidx.appcompat.app.AppCompatActivity 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 com.example.app.databinding.ActivityMainBinding class MainActivity : AppCompatActivity() { private val activityMainBinding by lazy { ActivityMainBinding.inflate(layoutInflater) } private val mapView: MapView by lazy { activityMainBinding.mapView } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(activityMainBinding.root) setApiKeyForApp() setupMap() } override fun onPause() { mapView.pause() super.onPause() } override fun onResume() { super.onResume() mapView.resume() } override fun onDestroy() { mapView.dispose() super.onDestroy() } private fun setApiKeyForApp(){ // set your API key // 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. ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY") } // set up your map here. You will call this method from onCreate() private fun setupMap() { // create a map with the BasemapStyle streets val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC) // set the map to be displayed in the layout's MapView mapView.map = map // set the viewpoint, Viewpoint(latitude, longitude, scale) mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 72000.0)) } }
Add import statements
Replace app-specific import statements with the imports needed for this tutorial.
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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
*
* https://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 android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
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.view.MapView
import com.example.app.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private val activityMainBinding by lazy {
ActivityMainBinding.inflate(layoutInflater)
}
private val mapView: MapView by lazy {
activityMainBinding.mapView
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(activityMainBinding.root)
setApiKeyForApp()
setupMap()
}
override fun onPause() {
mapView.pause()
super.onPause()
}
override fun onResume() {
super.onResume()
mapView.resume()
}
override fun onDestroy() {
mapView.dispose()
super.onDestroy()
}
private fun setApiKeyForApp(){
// set your API key
// 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.
ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
}
// set up your map here. You will call this method from onCreate()
private fun setupMap() {
// create a map with the BasemapStyle topographic
val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)
// create the service feature table
val serviceFeatureTable =
ServiceFeatureTable("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0")
// create the feature layer using the service feature table
val featureLayer = FeatureLayer(serviceFeatureTable)
map.operationalLayers.add(featureLayer)
// set the map to be displayed in the layout's MapView
mapView.map = map
// set the viewpoint, Viewpoint(latitude, longitude, scale)
mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 200000.0))
}
}
Change the view point scale
In the
setupMap()
method, modify theViewpoint
constructor call so it passes ascale
parameter more appropriate to this tutorial.MainActivity.ktUse dark colors for code blocks 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 76 77 78 79 80 80 80 80 80 80 80 80 80 81 82 83 84 85 86 87 87 87Change line Change line 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
/* * 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 * * https://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 android.os.Bundle import androidx.appcompat.app.AppCompatActivity import com.esri.arcgisruntime.ArcGISRuntimeEnvironment 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.view.MapView import com.example.app.databinding.ActivityMainBinding class MainActivity : AppCompatActivity() { private val activityMainBinding by lazy { ActivityMainBinding.inflate(layoutInflater) } private val mapView: MapView by lazy { activityMainBinding.mapView } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(activityMainBinding.root) setApiKeyForApp() setupMap() } override fun onPause() { mapView.pause() super.onPause() } override fun onResume() { super.onResume() mapView.resume() } override fun onDestroy() { mapView.dispose() super.onDestroy() } private fun setApiKeyForApp(){ // set your API key // 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. ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY") } // set up your map here. You will call this method from onCreate() private fun setupMap() { // create a map with the BasemapStyle topographic val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC) // create the service feature table val serviceFeatureTable = ServiceFeatureTable("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0") // create the feature layer using the service feature table val featureLayer = FeatureLayer(serviceFeatureTable) map.operationalLayers.add(featureLayer) // set the map to be displayed in the layout's MapView mapView.map = map // set the viewpoint, Viewpoint(latitude, longitude, scale) mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 200000.0)) } }
Create a service feature table to reference feature service data
To display a new data layer (also known as an operational layer) on top of the current basemap, you will create a ServiceFeatureTable
using an URL to reference the dataset hosted in ArcGIS Online.
Open a browser and navigate to the URL for Parks and Open Spaces to view metadata about the layer. To display the layer in your ArcGIS Runtime app, you only need the URL.
The service page provides information such as the geometry type, the geographic extent, the minimum and maximum scale at which features are visible, and the attributes (fields) it contains. You can preview the layer by clicking on ArcGIS.com Map in the "View In:" list at the top of the page.
In the
setupMap()
method, create aServiceFeatureTable
, using a string URL to reference the dataset. You will add Trailheads (points).A
ServiceFeatureTable
is effectively an in-memory database of the features from the service.MainActivity.ktUse dark colors for code blocks 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 76 77 78 79 80 81 82 83 83 82 81 80 79 79 79 79 79 79 79 79 79 79Add line. Add line. Add line. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
/* * 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 * * https://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 android.os.Bundle import androidx.appcompat.app.AppCompatActivity import com.esri.arcgisruntime.ArcGISRuntimeEnvironment 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.view.MapView import com.example.app.databinding.ActivityMainBinding class MainActivity : AppCompatActivity() { private val activityMainBinding by lazy { ActivityMainBinding.inflate(layoutInflater) } private val mapView: MapView by lazy { activityMainBinding.mapView } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(activityMainBinding.root) setApiKeyForApp() setupMap() } override fun onPause() { mapView.pause() super.onPause() } override fun onResume() { super.onResume() mapView.resume() } override fun onDestroy() { mapView.dispose() super.onDestroy() } private fun setApiKeyForApp(){ // set your API key // 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. ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY") } // set up your map here. You will call this method from onCreate() private fun setupMap() { // create a map with the BasemapStyle topographic val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC) // create the service feature table val serviceFeatureTable = ServiceFeatureTable("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0") // create the feature layer using the service feature table val featureLayer = FeatureLayer(serviceFeatureTable) map.operationalLayers.add(featureLayer) // set the map to be displayed in the layout's MapView mapView.map = map // set the viewpoint, Viewpoint(latitude, longitude, scale) mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 200000.0)) } }
Create a feature layer to display the hosted data
You will create a new FeatureLayer
to display the hosted layer above the basemap.
Create a new
FeatureLayer
using the service feature table and add it to the map as a data (operational) layer.If an app has multiple data layers, they are displayed in the order in which they are added to the app.
A
FeatureLayer
is simply a reference to a feature service and a fast and easy way to add data to a map. It is accessed via a URL which specifies the endpoint. By default, the API will try to load all of the features that fit into the current view.MainActivity.ktUse dark colors for code blocks 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 81 82 83 84 85 86 87 87 87 87 87 87 87 87 87 87 87Add line. Add line. Add line. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
/* * 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 * * https://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 android.os.Bundle import androidx.appcompat.app.AppCompatActivity import com.esri.arcgisruntime.ArcGISRuntimeEnvironment 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.view.MapView import com.example.app.databinding.ActivityMainBinding class MainActivity : AppCompatActivity() { private val activityMainBinding by lazy { ActivityMainBinding.inflate(layoutInflater) } private val mapView: MapView by lazy { activityMainBinding.mapView } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(activityMainBinding.root) setApiKeyForApp() setupMap() } override fun onPause() { mapView.pause() super.onPause() } override fun onResume() { super.onResume() mapView.resume() } override fun onDestroy() { mapView.dispose() super.onDestroy() } private fun setApiKeyForApp(){ // set your API key // 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. ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY") } // set up your map here. You will call this method from onCreate() private fun setupMap() { // create a map with the BasemapStyle topographic val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC) // create the service feature table val serviceFeatureTable = ServiceFeatureTable("https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0") // create the feature layer using the service feature table val featureLayer = FeatureLayer(serviceFeatureTable) map.operationalLayers.add(featureLayer) // set the map to be displayed in the layout's MapView mapView.map = map // set the viewpoint, Viewpoint(latitude, longitude, scale) mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 200000.0)) } }Click Run > Run > app to run the app.
You should see point features (representing trailheads) draw on the map for an area in the Santa Monica Mountains in southern California.
What's next?
Learn how to use additional API features, ArcGIS loction services, and ArcGIS tools in these tutorials: