Export vector tiles

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Sample viewer app

Export tiles from an online vector tile service.

Image of export vector tiles

Use case

Field workers with limited network connectivity can use exported vector tiles as a basemap for use while offline.

How to use the sample

When the vector tiled layer loads, zoom in to the extent you want to export. The red box shows the extent that will be exported. Click the "Export Vector Tiles" button to start the job. An error will show if the extent is larger than the maximum limit allowed. When finished, a dialog will show the exported result in a new map view.

How it works

  1. Create an ExportVectorTilesTask, passing in the PortalItem for the vector tiled layer. Since vector tiled layers are premium content, you must first authenticate with the Portal.
  2. Create default ExportVectorTilesParameters from the task, specifying extent and maximum scale.
  3. Create a ExportVectorTilesJob from the task using the parameters, and specifying a vector tile cache path and an item resource path. The resource path is required if you want to export the tiles with the style.
  4. Start the job, and once it completes successfully, get the resulting ExportVectorTilesResult.
  5. Get the VectorTileCache and ItemResourceCache from the result to create an ArcGISVectorTiledLayer that can be displayed to the map view.

Relevant API

  • ArcGISVectorTiledLayer
  • ExportVectorTilesJob
  • ExportVectorTilesParameters
  • ExportVectorTilesResult
  • ExportVectorTilesTask
  • ItemResourceCache
  • VectorTileCache

Additional information

NOTE: Downloading Tiles for offline use requires authentication with the web map's server. To use this sample, you will require an ArcGIS Online account.

Vector tiles have high drawing performance and smaller file size compared to regular tiled layers, due to consisting solely of points, lines, and polygons. However, in the ArcGIS Runtime API they cannot be displayed in scenes.

Tags

cache, download, offline, vector

Sample Code

ExportVectorTilesSample.java
                                                                                                                                                                                                                                                        
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/*
 * Copyright 2018 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.export_vector_tiles;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.concurrent.ExecutionException;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.concurrent.Job;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.VectorTileCache;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.layers.ArcGISVectorTiledLayer;
import com.esri.arcgisruntime.layers.Layer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.ItemResourceCache;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;
import com.esri.arcgisruntime.security.AuthenticationManager;
import com.esri.arcgisruntime.security.DefaultAuthenticationChallengeHandler;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.tasks.vectortilecache.ExportVectorTilesJob;
import com.esri.arcgisruntime.tasks.vectortilecache.ExportVectorTilesParameters;
import com.esri.arcgisruntime.tasks.vectortilecache.ExportVectorTilesResult;
import com.esri.arcgisruntime.tasks.vectortilecache.ExportVectorTilesTask;

public class ExportVectorTilesSample extends Application {

  private MapView mapView;
  private PortalItem portalItem; // 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("Export Vector Tiles Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();

      // set the map to the map view
      mapView = new MapView();

      // authenticate with an organization account on arcgis.com
      AuthenticationManager.setAuthenticationChallengeHandler(new DefaultAuthenticationChallengeHandler());

      // get the portal item of the vector tile service
      Portal portal = new Portal("http://www.arcgis.com", true);
      portalItem = new PortalItem(portal, "86f556a2d1fd468181855a35e344567f");
      portalItem.addDoneLoadingListener(() -> {
        if (portalItem.getLoadStatus() == LoadStatus.LOADED) {
          // loading the vector tiled layer will invoke the authentication challenge
          ArcGISVectorTiledLayer vectorTiledLayer = new ArcGISVectorTiledLayer(portalItem);
          ArcGISMap map = new ArcGISMap(new Basemap(vectorTiledLayer));
          mapView.setMap(map);
        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, portalItem.getLoadError().getCause().getMessage());
          alert.show();
        }
      });
      portalItem.loadAsync();

      // create a graphics overlay for the map view
      GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
      mapView.getGraphicsOverlays().add(graphicsOverlay);

      // create a graphic to show a box around the tiles we want to download
      Graphic downloadArea = new Graphic();
      graphicsOverlay.getGraphics().add(downloadArea);
      SimpleLineSymbol simpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFFFF0000, 2);
      downloadArea.setSymbol(simpleLineSymbol);

      // update the box whenever the viewpoint changes
      mapView.addViewpointChangedListener(viewpointChangedEvent -> {
        if (mapView.getMap().getLoadStatus() == LoadStatus.LOADED) {
          // upper left corner of the downloaded tile cache area
          Point2D minScreenPoint = new Point2D(50, 50);
          // lower right corner of the downloaded tile cache area
          Point2D maxScreenPoint = new Point2D(mapView.getWidth() - 50, mapView.getHeight() - 50);
          // convert screen points to map points
          Point minPoint = mapView.screenToLocation(minScreenPoint);
          Point maxPoint = mapView.screenToLocation(maxScreenPoint);
          // use the points to define and return an envelope
          if (minPoint != null && maxPoint != null) {
            Envelope envelope = new Envelope(minPoint, maxPoint);
            downloadArea.setGeometry(envelope);
          }
        }
      });

      // create button to export tiles
      Button exportTilesButton = new Button("Export Vector Tiles");

      // create progress bar to show task progress
      ProgressBar progressBar = new ProgressBar();
      progressBar.setProgress(0.0);
      progressBar.setVisible(false);

      // when the button is clicked, export the tiles to a temporary file
      exportTilesButton.setOnAction(e -> {
        try {
          // disable the button and show the progress bar
          exportTilesButton.setDisable(true);
          progressBar.setVisible(true);

          // create a file and define the scale for the job
          File vtpkFile = File.createTempFile("tiles", ".vtpk");
          File resDir = Files.createTempDirectory("StyleItemResources").toFile();

          Layer layer = mapView.getMap().getBasemap().getBaseLayers().get(0);
          double maxScale = layer.getMaxScale();

          // create a task
          ExportVectorTilesTask exportVectorTilesTask = new ExportVectorTilesTask((PortalItem) layer.getItem());

          // create parameters for the export vector tiles job
          ListenableFuture<ExportVectorTilesParameters> exportVectorTilesParametersFuture = exportVectorTilesTask
              .createDefaultExportVectorTilesParametersAsync(downloadArea.getGeometry(), maxScale);
          exportVectorTilesParametersFuture.addDoneListener(() -> {
            try {
              ExportVectorTilesParameters exportVectorTilesParameters = exportVectorTilesParametersFuture.get();

              // create a job with the parameters
              ExportVectorTilesJob exportVectorTilesJob =
                      exportVectorTilesTask.exportVectorTiles(exportVectorTilesParameters, vtpkFile.getAbsolutePath(), resDir.getAbsolutePath());

              // start the job and wait for it to finish
              exportVectorTilesJob.start();
              exportVectorTilesJob.addProgressChangedListener(() -> progressBar.setProgress(exportVectorTilesJob.getProgress() / 100.0));
              exportVectorTilesJob.addJobDoneListener(() -> {

                if (exportVectorTilesJob.getStatus() == Job.Status.SUCCEEDED) {
                  // show preview of exported tiles in alert
                  ExportVectorTilesResult tilesResult = exportVectorTilesJob.getResult();
                  VectorTileCache tileCache = tilesResult.getVectorTileCache();
                  ItemResourceCache resourceCache = tilesResult.getItemResourceCache();
                  Alert preview = new Alert(Alert.AlertType.INFORMATION);
                  preview.initOwner(mapView.getScene().getWindow());
                  preview.setTitle("Preview");
                  preview.setHeaderText("Exported tiles to " + tileCache.getPath() + "\nExported resources to " +
                      resourceCache.getPath());
                  MapView mapPreview = new MapView();
                  mapPreview.setMinSize(400, 400);
                  ArcGISVectorTiledLayer tiledLayerPreview = new ArcGISVectorTiledLayer(tileCache, resourceCache);
                  ArcGISMap previewMap = new ArcGISMap(new Basemap(tiledLayerPreview));
                  mapPreview.setMap(previewMap);
                  preview.getDialogPane().setContent(mapPreview);
                  preview.show();

                } else {
                  Alert alert = new Alert(Alert.AlertType.ERROR, exportVectorTilesJob.getError().getAdditionalMessage());
                  alert.show();
                }

                Platform.runLater(() -> {
                  progressBar.setVisible(false);
                  exportTilesButton.setDisable(false);
                });
              });

            } catch (InterruptedException | ExecutionException ex) {
              Alert alert = new Alert(Alert.AlertType.ERROR, ex.getMessage());
              alert.show();
              progressBar.setVisible(false);
              progressBar.setProgress(0);
            }
          });

        } catch (IOException ex) {
          Alert alert = new Alert(Alert.AlertType.ERROR, "Failed to create temporary file");
          alert.show();
        }
      });

      // add the map view, button, and progress bar to stack pane
      stackPane.getChildren().addAll(mapView, exportTilesButton, progressBar);
      StackPane.setAlignment(exportTilesButton, Pos.BOTTOM_CENTER);
      StackPane.setMargin(exportTilesButton, new Insets(0, 0, 100, 0));
      StackPane.setAlignment(progressBar, Pos.BOTTOM_CENTER);
      StackPane.setMargin(progressBar, new Insets(0, 0, 80, 0));

    } 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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