Feature layer (geodatabase)

View on GitHub
Sample viewer app

Display features from a local geodatabase.

Image of feature layer geodatabase

Use case

Accessing data from a local geodatabase 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 local geodatabase 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 geodatabase.

How it works

  1. Create a geodatabase using the provided local resource, new Geodatabase(geodatabaseResourceUrl).
  2. Wait for geodatabase to load, Geodatabase.addDoneLoadingListener(runnable).
  3. Get the 'Trailheads' GeodatabaseFeatureTable from the geodatabase, Geodatabase.getGeodatabaseFeatureTable(tableName).
  4. Create feature layer using the table from above, new FeatureLayer(geodatabaseFeatureTable).
  5. Add feature layer to ArcGISMap with ArcGISMap.getOperationalLayers().add(featureLayer).

Relevant API

  • FeatureLayer
  • Geodatabase
  • GeodatabaseFeatureTable

About the data

The sample shows trailheads in the greater Los Angeles area displayed on top of a vector tile basemap.

Additional information

One of the ArcGIS Runtime data set types that can be accessed via the local storage of the device (i.e. hard drive, flash drive, micro SD card, USB stick, etc.) is a mobile geodatabase. A mobile geodatabase can be provisioned for use in an ArcGIS Runtime application by ArcMap. The following provide some helpful tips on how to create a mobile geodatabase file:

In ArcMap, choose File > Share As > ArcGIS Runtime Content from the menu items to create the .geodatabase file (see the Creating ArcGIS Runtime content document.

Note: You could also use the 'Services Pattern' and access the Geodatabase class via a Feature Service served up via ArcGIS Online or ArcGIS Enterprise. Instead of using the Geodatabase class to access the .geodatabase file on disk, you would use GeodatabaseSyncTask to point to a Uri instead.

Tags

geodatabase, mobile, offline

Sample Code

FeatureLayerGeodatabaseSample.java
                                                                                                                                 
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
/*
 * 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_geodatabase;

import java.io.File;

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.Geodatabase;
import com.esri.arcgisruntime.data.GeodatabaseFeatureTable;
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.view.MapView;

public class FeatureLayerGeodatabaseSample extends Application {

  private MapView mapView;
  // keep loadables in scope to avoid garbage collection
  private Geodatabase geodatabase;
  private FeatureLayer featureLayer;

  @Override
  public void start(Stage stage) {

    try {

      // create stack pane and JavaFX app scene
      StackPane stackPane = new StackPane();
      Scene fxScene = new Scene(stackPane);

      // set title, size, and add JavaFX scene to stage
      stage.setTitle("Feature Layer Geodatabase Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(fxScene);
      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 geodatabase from local resource
      File geodatabaseFile = new File(System.getProperty("data.dir"), "./samples-data/los_angeles/LA_Trails" +
              ".geodatabase");
      geodatabase = new Geodatabase(geodatabaseFile.getAbsolutePath());
      geodatabase.addDoneLoadingListener(() -> {
        if (geodatabase.getLoadStatus() == LoadStatus.LOADED) {
          // access the geodatabase's feature table Trailheads
          GeodatabaseFeatureTable geodatabaseFeatureTable = geodatabase.getGeodatabaseFeatureTable("Trailheads");
          geodatabaseFeatureTable.loadAsync();
          // create a layer from the geodatabase feature table above and add to map
          featureLayer = new FeatureLayer(geodatabaseFeatureTable);
          featureLayer.addDoneLoadingListener(() -> {
            if (featureLayer.getLoadStatus() == LoadStatus.LOADED) {
              // set viewpoint to the location of feature layer's features
              mapView.setViewpointCenterAsync(featureLayer.getFullExtent().getCenter(), 1000000);
            } else {
              Alert alert = new Alert(Alert.AlertType.ERROR, "Feature Layer Failed to Load!");
              alert.show();
            }
          });
          // display feature layer to the map view
          map.getOperationalLayers().add(featureLayer);
        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, "Geodatabase Failed to Load!");
          alert.show();
        }
      });
      // load geodatabase
      geodatabase.loadAsync();

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

}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.