Feature collection layer from portal

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Create a feature collection layer from a portal item.

Image of create feature collection layer portal item

Use case

Feature collection layers are often used to hold features with mixed geometry or unstructured data. You can display feature collections stored in a Portal, which are often used for showing content from a CSV or map notes.

How to use the sample

The feature collection is loaded from the Portal item when the sample starts. Enter the ID of a Portal item that holds a feature collection into the text field, and click on the button to see result.

How it works

  1. Create a Portal.
  2. Create the PortalItem, referring to the portal and an item ID.
  3. Verify that the item represents a feature collection.
  4. Create a FeatureCollection from the item.
  5. Create a FeatureCollectionLayer, referring to the feature collection.
  6. Add the feature collection layer to the map's operational layers collection.

Relevant API

  • FeatureCollection
  • FeatureCollectionLayer
  • Feature
  • Portal
  • PortalItem

About the data

The sample uses a sample layer depicting world populations.

Tags

collection, feature collection, feature collection layer, id, item, map notes, portal

Sample Code

FeatureCollectionLayerFromPortalSample.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.esri.samples.feature_collection_layer_from_portal;

import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.application.Application;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.FeatureCollection;
import com.esri.arcgisruntime.layers.FeatureCollectionLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;

public class FeatureCollectionLayerFromPortalSample extends Application {

  private ArcGISMap map;
  private MapView mapView;
  private Portal portal;
  private TextField inputTextField;
  private PortalItem portalItem; // keep loadable in scope to avoid garbage collection

  @Override
  public void start(Stage stage) {
    // set up the application scene
    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);

      // set title, size, and add scene to stage
      stage.setTitle("Feature Collection Layer From Portal");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // authentication with an API key or named user is required to access basemaps and other location services
      String yourAPIKey = System.getProperty("apiKey");
      ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);

      // create a map with the oceans basemap style
      map = new ArcGISMap(BasemapStyle.ARCGIS_OCEANS);

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);

      // create portal
      portal = new Portal("https://www.arcgis.com/");

      // create text field to input user's own portal item ID
      inputTextField = new TextField("32798dfad17942858d5eef82ee802f0b");
      inputTextField.setMaxWidth(250);

      // fetch the default feature collection layer from the portal
      fetchFeatureCollectionFromPortal();

      // create button to perform action
      Button fetchFromPortalButton = new Button("Open from portal item");
      fetchFromPortalButton.setMaxWidth(250);

      // verify the input and fetch the portal item
      fetchFromPortalButton.setOnAction(e -> fetchFeatureCollectionFromPortal());

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, inputTextField, fetchFromPortalButton);
      StackPane.setAlignment(inputTextField, Pos.TOP_LEFT);
      StackPane.setMargin(inputTextField, new Insets(10, 0, 0, 10));
      StackPane.setAlignment(fetchFromPortalButton, Pos.TOP_LEFT);
      StackPane.setMargin(fetchFromPortalButton, new Insets(40, 0, 0, 10));

    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Fetch feature collection from portal and load as feature layer.
   */
  private void fetchFeatureCollectionFromPortal() {

    if (!inputTextField.getText().isEmpty()) {
      // crate portal item
      portalItem = new PortalItem(portal, inputTextField.getText());
      portalItem.loadAsync();

      portalItem.addDoneLoadingListener(() -> {

        if (portalItem.getLoadStatus() == LoadStatus.LOADED) {

          if (portalItem.getType() == PortalItem.Type.FEATURE_COLLECTION) {

            // create feature collection and add to the map as a layer
            FeatureCollection  featureCollection = new FeatureCollection(portalItem);
            FeatureCollectionLayer featureCollectionLayer = new FeatureCollectionLayer(featureCollection);

            // add feature collection layer to the map
            map.getOperationalLayers().clear();
            map.getOperationalLayers().add(featureCollectionLayer);

          } else {
            new Alert(Alert.AlertType.ERROR, "Portal item is not a feature collection").show();
          }
        } else {
          new Alert(Alert.AlertType.ERROR, "Portal item failed to load").show();
        }
      });
    } else {
      new Alert(Alert.AlertType.ERROR, "Portal Item ID is empty").show();
    }

  }
  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    if (mapView != null) {
      mapView.dispose();
    }
  }

  /**
   * Opens and runs application.
   *
   * @param args arguments passed to this application
   */
  public static void main(String[] args) {

    Application.launch(args);
  }
}

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