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Merge pull request #219 from Esri/read-geopackage
Implement Read GeoPackage sample
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‎src/main/java/com/esri/samples/map/read_geopackage/README.md‎

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<h1>Read GeoPackage</h1>
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<p>Demonstrates how to read rasters and feature tables from geoPackages to show them as layers in a map.</p>
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<p><img src="ReadGeoPackage.png" /></p>
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<h2>How to use the sample</h2>
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<p>The layers in the geoPackage, which have not been added to the map are shown in the bottom list. Click an item to
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show it as a layer in the map. Layers in the map are listed in the top list. Click layers from the top list to
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remove them from the map.</p>
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<h2>How it works</h2>
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<p>To read layers from a geoPackage and show them in a map:</p>
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<ol>
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<li>Create a <code>GeoPackage</code> with the path to the local geoPackage file.</li>
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<li>Load the <code>GeoPackage</code> with <code>GeoPackage.loadAsync</code>.</li>
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<li>Create raster layers for each of these with <code>new RasterLayer(geoPackageRaster)</code>.</li>
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<li>Add each layer to the map as an operational layer with <code>map.getOperationalLayers().add(layer)</code>.</li>
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<li>When it's done loading, get the <code>GeoPackageFeatureTable</code>s inside with <code>geoPackage
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.getGeoPackageFeatureTables()</code>.</li>
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<li>For each feature table, create a feature layer with <code>new FeatureLayer(featureTable)</code>.</li>
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<li>You can also get the <code>GeoPackageRaster</code>s inside using <code>GeoPackage.getGeoPackageRasters()</code>.</li>
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</ol>
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<h2>Features</h2>
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<ul>
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<li>ArcGISMap</li>
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<li>Basemap</li>
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<li>FeatureLayer</li>
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<li>GeoPackage</li>
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<li>GeoPackageFeatureTable</li>
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<li>GeoPackageRaster</li>
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<li>Layer</li>
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<li>MapView</li>
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<li>RasterLayer</li>
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</ul>

‎src/main/java/com/esri/samples/map/read_geopackage/ReadGeoPackage.png‎

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‎src/main/java/com/esri/samples/map/read_geopackage/ReadGeoPackageSample.java‎

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/*
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* Copyright 2018 Esri.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.esri.samples.map.read_geopackage;
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import java.io.File;
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import javafx.application.Application;
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import javafx.geometry.Insets;
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import javafx.geometry.Pos;
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import javafx.scene.Scene;
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import javafx.scene.control.Label;
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import javafx.scene.control.ListCell;
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import javafx.scene.control.ListView;
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import javafx.scene.input.MouseButton;
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import javafx.scene.layout.StackPane;
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import javafx.scene.layout.VBox;
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import javafx.stage.Stage;
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import javafx.util.Callback;
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import com.esri.arcgisruntime.data.GeoPackage;
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import com.esri.arcgisruntime.data.GeoPackageFeatureTable;
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import com.esri.arcgisruntime.layers.FeatureLayer;
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import com.esri.arcgisruntime.layers.Layer;
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import com.esri.arcgisruntime.layers.RasterLayer;
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import com.esri.arcgisruntime.mapping.ArcGISMap;
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import com.esri.arcgisruntime.mapping.Basemap;
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import com.esri.arcgisruntime.mapping.view.MapView;
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import com.esri.arcgisruntime.raster.GeoPackageRaster;
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public class ReadGeoPackageSample extends Application {
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private MapView mapView;
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@Override
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public void start(Stage stage) throws Exception {
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try {
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// create stack pane and application scene
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StackPane stackPane = new StackPane();
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Scene scene = new Scene(stackPane);
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scene.getStylesheets().add(getClass().getResource("/css/style.css").toExternalForm());
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// set title, size, and add scene to stage
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stage.setTitle("Read GeoPackage Sample");
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stage.setWidth(800);
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stage.setHeight(700);
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stage.setScene(scene);
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stage.show();
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// create a map and add it to the map view
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final ArcGISMap map = new ArcGISMap(Basemap.Type.STREETS, 39.7294, -104.8319, 11);
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mapView = new MapView();
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mapView.setMap(map);
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// create two list views, one showing the layers in the map,
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// the other, showing the layers in the geoPackage not yet added to the map
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ListView<Layer> mapLayers = new ListView<>();
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ListView<Layer> geoPackageLayers = new ListView<>();
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// create labels for the lists
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Label mapLayersLabel = new Label("Map layers");
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Label geoPackageLayersLabel = new Label("GeoPackage layers (not in the map)");
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mapLayersLabel.getStyleClass().add("panel-label");
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geoPackageLayersLabel.getStyleClass().add("panel-label");
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// create a control panel
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VBox vBoxControl = new VBox(6);
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vBoxControl.setMaxSize(250, 260);
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vBoxControl.getStyleClass().add("panel-region");
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// add labels and lists to the control panel
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vBoxControl.getChildren().addAll(mapLayersLabel, mapLayers, geoPackageLayersLabel, geoPackageLayers);
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// create a cell factory to show the layer descriptions in the list view
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Callback<ListView<Layer>, ListCell<Layer>> cellFactory = list -> new ListCell<Layer>() {
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@Override
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protected void updateItem(Layer layer, boolean bln) {
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super.updateItem(layer, bln);
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if (layer != null) {
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if (layer instanceof FeatureLayer) {
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FeatureLayer featureLayer = (FeatureLayer) layer;
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GeoPackageFeatureTable featureTable = (GeoPackageFeatureTable) featureLayer.getFeatureTable();
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setText(featureTable.getDescription());
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} else if (layer instanceof RasterLayer) {
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RasterLayer rasterLayer = (RasterLayer) layer;
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GeoPackageRaster raster = (GeoPackageRaster) rasterLayer.getRaster();
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setText(raster.getDescription());
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}
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} else {
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setText(null);
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}
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}
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};
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mapLayers.setCellFactory(cellFactory);
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geoPackageLayers.setCellFactory(cellFactory);
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// when you click on a layer in the geopackage layers list view, add it to the map
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geoPackageLayers.setOnMouseClicked(e -> {
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if (e.isStillSincePress() && e.getButton() == MouseButton.PRIMARY) {
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// get selected layer
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Layer layer = geoPackageLayers.getSelectionModel().getSelectedItem();
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if (layer != null) {
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// add it to the map and the top of the map layers list
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map.getOperationalLayers().add(layer);
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mapLayers.getItems().add(0, layer);
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// remove it from the geoPackage layers list
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geoPackageLayers.getItems().remove(layer);
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}
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}
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});
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// when you click on a layer in the map layers list view, remove it from the map
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mapLayers.setOnMouseClicked(e -> {
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if (e.isStillSincePress() && e.getButton() == MouseButton.PRIMARY) {
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// get selected layer
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Layer layer = mapLayers.getSelectionModel().getSelectedItem();
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if (layer != null) {
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// remove it from the map and the map layers list
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map.getOperationalLayers().remove(layer);
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mapLayers.getItems().remove(layer);
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// add it back to the geoPackage layers list
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geoPackageLayers.getItems().add(layer);
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}
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}
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});
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// read the raster and feature layers from the geoPackage and show them in the list view
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File geoPackageFile = new File("./samples-data/auroraCO/AuroraCO.gpkg");
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GeoPackage geoPackage = new GeoPackage(geoPackageFile.getAbsolutePath());
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geoPackage.loadAsync();
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geoPackage.addDoneLoadingListener(() -> {
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geoPackage.getGeoPackageRasters().forEach(r -> {
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RasterLayer rasterLayer = new RasterLayer(r);
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// make the raster layer semi-transparent so we can see layers below it
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rasterLayer.setOpacity(0.5f);
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geoPackageLayers.getItems().add(rasterLayer);
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});
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geoPackage.getGeoPackageFeatureTables().forEach(t -> geoPackageLayers.getItems().add(new FeatureLayer(t)));
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});
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// add the map view and control box to stack pane
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stackPane.getChildren().addAll(mapView, vBoxControl);
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StackPane.setAlignment(vBoxControl, Pos.TOP_LEFT);
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StackPane.setMargin(vBoxControl, new Insets(10, 0, 0, 10));
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} catch (Exception e) {
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// on any error, display the stack trace
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e.printStackTrace();
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}
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}
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/**
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* Stops and releases all resources used in application.
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*/
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@Override
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public void stop() {
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if (mapView != null) {
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mapView.dispose();
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}
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}
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/**
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* Opens and runs application.
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*
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* @param args arguments passed to this application
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*/
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public static void main(String[] args) {
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Application.launch(args);
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}
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}

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