Reverse geocode online

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Sample viewer app

Use an online service to find the address for a point on the map.

Image of reverse geocode

Use case

You might use a geocoder to find a customer's delivery address based on the location returned by their device's GPS.

How to use the sample

Click on the map to see the nearest address displayed in a callout.

How it works

  1. Create a LocatorTask object using a URL to a geocoder service.
  2. Set the GeocodeParameters for the LocatorTask and specify the geocoder's attributes.
  3. Get the matching results from the GeocodeResult using LocatorTask.reverseGeocodeAsync.
  4. Show the results using a PictureMarkerSymbol and add the symbol to a Graphic in the GraphicsOverlay.

Relevant API

  • GeocodeParameters
  • LocatorTask
  • ReverseGeocodeParameters

Tags

address, geocode, locate, reverse geocode, search

Sample Code

ReverseGeocodeOnlineSample.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.reverse_geocode_online;

import java.util.HashMap;
import java.util.List;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.image.Image;
import javafx.scene.input.MouseButton;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Duration;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.Callout;
import com.esri.arcgisruntime.mapping.view.Callout.LeaderPosition;
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.symbology.PictureMarkerSymbol;
import com.esri.arcgisruntime.tasks.geocode.GeocodeResult;
import com.esri.arcgisruntime.tasks.geocode.LocatorTask;
import com.esri.arcgisruntime.tasks.geocode.ReverseGeocodeParameters;

public class ReverseGeocodeOnlineSample extends Application {

  private MapView mapView;
  private LocatorTask locatorTask;
  private GraphicsOverlay graphicsOverlay;
  private PictureMarkerSymbol pinSymbol;
  private ProgressIndicator progressIndicator;

  @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("Reverse Geocode Online 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);

      // add a progress indicator
      progressIndicator = new ProgressIndicator(ProgressIndicator.INDETERMINATE_PROGRESS);
      progressIndicator.setMaxSize(40, 40);
      progressIndicator.setStyle("-fx-progress-color: white;");
      progressIndicator.setVisible(false);

      // create a map with the imagery basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY);

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

      // set a viewpoint on the map view
      mapView.setViewpoint(new Viewpoint(40, -95, 36978595));

      // add a graphics overlay
      graphicsOverlay = new GraphicsOverlay();
      mapView.getGraphicsOverlays().add(graphicsOverlay);

      // set the callout's default style
      Callout callout = mapView.getCallout();
      callout.setLeaderPosition(LeaderPosition.BOTTOM);

      // create a locator task
      locatorTask = new LocatorTask("https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer");

      // create geocode task parameters
      ReverseGeocodeParameters reverseGeocodeParameters = new ReverseGeocodeParameters();
      reverseGeocodeParameters.setOutputSpatialReference(mapView.getSpatialReference());

      // create a pin graphic
      Image img = new Image(getClass().getResourceAsStream("/pin.png"), 0, 80, true, true);
      pinSymbol = new PictureMarkerSymbol(img);
      pinSymbol.loadAsync();

      // get geocode on click
      mapView.setOnMouseClicked(evt -> {
        // check that the primary mouse button was clicked and user is not
        // panning
        if (evt.isStillSincePress() && evt.getButton() == MouseButton.PRIMARY) {

          // create a point from where the user clicked
          Point2D point = new Point2D(evt.getX(), evt.getY());

          // create a map point from a point
          Point mapPoint = mapView.screenToLocation(point);

          // show progress indicator
          progressIndicator.setVisible(true);

          // run the locator geocode task
          ListenableFuture<List<GeocodeResult>> results = locatorTask.reverseGeocodeAsync(mapPoint,
              reverseGeocodeParameters);

          // add a listener to display the result when loaded
          results.addDoneListener(() -> {
            try {
              List<GeocodeResult> geocodes = results.get();

              if (geocodes.size() > 0) {
                // get the top result
                GeocodeResult geocode = geocodes.get(0);

                // set the viewpoint to the marker
                Point location = geocode.getDisplayLocation();
                mapView.setViewpointCenterAsync(location);

                // get attributes from the result for the callout
                String address = geocode.getAttributes().get("Match_addr").toString();
                HashMap<String, Object> attributes = new HashMap<>();
                attributes.put("title", address.split(",")[0]);
                attributes.put("detail", address.substring(address.indexOf(", ") + 2));

                // create the marker
                Graphic marker = new Graphic(geocode.getDisplayLocation(), attributes, pinSymbol);

                // update the marker
                Platform.runLater(() -> {
                  // clear out previous results
                  graphicsOverlay.getGraphics().clear();

                  // add the marker to the graphics overlay
                  graphicsOverlay.getGraphics().add(marker);

                  // stop the progress indicator
                  progressIndicator.setVisible(false);

                  // display the callout
                  callout.setTitle(marker.getAttributes().get("title").toString());
                  callout.setDetail(marker.getAttributes().get("detail").toString());
                  callout.showCalloutAt(location, new Point2D(0, -24), Duration.ZERO);
                });
              }
            } catch (Exception e) {
              // handle address not found
              progressIndicator.setVisible(false);
              Platform.runLater(() -> {
                Alert alert = new Alert(Alert.AlertType.INFORMATION);
                alert.setHeaderText(null);
                alert.setContentText("No address found at this location");
                alert.showAndWait();
              });
            }
          });
        }
      });

      // add map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, progressIndicator);
      StackPane.setAlignment(progressIndicator, Pos.BOTTOM_LEFT);

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

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    // release resources when the application closes
    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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