Feature layer (GeoPackage)

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Sample viewer app

Display features from a local GeoPackage.

Image of feature layer geopackage

Use case

A GeoPackage is an OGC standard, making it useful when your project requires an open source data format or when other, non-ArcGIS systems may be creating the data. Accessing data from a local GeoPackage is useful when working in an environment that has an inconsistent internet connection or that does not have an internet connection at all. For example, a department of transportation field worker might source map data from a GeoPackage when conducting signage inspections in rural areas with poor network coverage.

How to use the sample

Pan and zoom around the map. View the data loaded from the geopackage.

How it works

  1. Create a GeoPackage passing the URI string into the constructor.
  2. Load the GeoPackage with GeoPackage.loadAsync
  3. When it's done loading, get the GeoPackageFeatureTable objects from the geopackage with geoPackage.getGeoPackageFeatureTables()
  4. Create a FeatureLayer(featureTable) for each feature table and add it to the map as an operational layer. Add each to the map as an operational layer with map.getOperationalLayers().add(featureLayer)

Relevant API

  • ArcGISMap
  • FeatureLayer
  • GeoPackage
  • GeoPackageFeatureTable

About the data

The map shows point locations of public art installations in Aurora, Colorado.

Tags

feature table, geopackage, gpkg, OGC, package, standards

Sample Code

FeatureLayerGeoPackageSample.java
                                                                                                                          
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/*
 * Copyright 2017 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_layer_geopackage;

import java.io.File;
import java.util.List;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.GeoPackage;
import com.esri.arcgisruntime.data.GeoPackageFeatureTable;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
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;

public class FeatureLayerGeoPackageSample extends Application {

  private MapView mapView;
  private GeoPackage geoPackage; // keep loadable in scope to avoid garbage collection

  @Override
  public void start(Stage stage) {

    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 Layer GeoPackage Sample");
      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 streets basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS);

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

      // create a GeoPackage from a local gpkg file
      File geoPackageFile = new File(System.getProperty("data.dir"), "./samples-data/auroraCO/AuroraCO.gpkg");
      geoPackage = new GeoPackage(geoPackageFile.getAbsolutePath());
      geoPackage.loadAsync();

      // create a feature layer from the first feature table in the gpkg
      geoPackage.addDoneLoadingListener(() -> {
        if (geoPackage.getLoadStatus() == LoadStatus.LOADED) {
          List<GeoPackageFeatureTable> featureTables = geoPackage.getGeoPackageFeatureTables();
          if (featureTables.size() > 0) {
            FeatureLayer featureLayer = new FeatureLayer(featureTables.get(0));
            map.getOperationalLayers().add(featureLayer);
            // zoom to the layer
            featureLayer.addDoneLoadingListener(() ->
              mapView.setViewpointAsync(new Viewpoint(featureLayer.getFullExtent()))
            );
          }
        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, geoPackage.getLoadError().getMessage());
          alert.show();
        }
      });

      // add the map view to stack pane
      stackPane.getChildren().add(mapView);

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

  /**
   * 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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