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
Create a geodatabase using the provided local resource, new Geodatabase(geodatabaseResourceUrl).
Wait for geodatabase to load, Geodatabase.addDoneLoadingListener(runnable).
Get the 'Trailheads' GeodatabaseFeatureTable from the geodatabase, Geodatabase.getGeodatabaseFeatureTable(tableName).
Create feature layer using the table from above, new FeatureLayer(geodatabaseFeatureTable).
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.
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
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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_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;
publicclassFeatureLayerGeodatabaseSampleextendsApplication{
private MapView mapView;
// keep loadables in scope to avoid garbage collectionprivate Geodatabase geodatabase;
private FeatureLayer featureLayer;
@Overridepublicvoidstart(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.
*/@Overridepublicvoidstop(){
if (mapView != null) {
mapView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}