Download preplanned map area

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Kotlin

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Sample viewer app

Take a map offline using a preplanned map area.

Image of download preplanned map area

Use case

Generating offline maps on demand for a specific area can be time consuming for users and a processing load on the server. If areas of interest are known ahead of time, a web map author can pre-create packages for these areas. This way, the generation only needs to happen once, making the workflow more efficient for users and servers.

An archaeology team could define preplanned map areas for dig sites which can be taken offline for field use.

How to use the sample

Select a map area from the Preplanned Map Areas list. Click the Download button to download the selected area. The download progress will be shown in the Downloads list. When a download is complete, select it to display the offline map in the map view.

How it works

Open the online ArcGISMap from a PortalItem and display it.
Create an OfflineMapTask using the portal item.
Get the PreplannedMapAreas from the task, and then load them.
To download a selected map area, create the default DownloadPreplannedOfflineMapParameters from the task using the selected preplanned map area.
Set the update mode of the preplanned map area.
Use the parameters and a local path to create a DownloadPreplannedOfflineMapJob from the task.
Start the job. Once it has completed, get the DownloadPreplannedOfflineMapResult.
Get the ArcGISMap from the result and display it in the MapView.

Relevant API

DownloadPreplannedOfflineMapJob
DownloadPreplannedOfflineMapParameters
DownloadPreplannedOfflineMapResult
OfflineMapTask
PreplannedMapArea

About the data

The Naperville stormwater network map is based on ArcGIS Solutions for Stormwater and provides a realistic depiction of a theoretical stormwater network.

Additional information

PreplannedUpdateMode can be used to set the way the preplanned map area receives updates in several ways:

NO_UPDATES - No updates will be performed. This mode is intended for when a static snapshot of the data is required, and it does not create a replica. This is the mode used for this sample.
SYNC_WITH_FEATURE_SERVICES - Changes, including local edits, will be synced directly with the underlying feature services. This is the default update mode.
DOWNLOAD_SCHEDULED_UPDATES - Scheduled, read-only updates will be downloaded from the online map area and applied to the local mobile geodatabases.

For more information about offline workflows, see Offline maps, scenes, and data in the ArcGIS Developers guide.

Sample Code

MainActivity.java

ProgressDialogFragment.java

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/*
 *  Copyright 2019 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.arcgisruntime.sample.downloadpreplannedmaparea;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;

import android.graphics.Color;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import com.esri.arcgisruntime.ArcGISRuntimeException;
import com.esri.arcgisruntime.concurrent.Job;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.FeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.layers.Layer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Viewpoint;
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.symbology.SimpleRenderer;
import com.esri.arcgisruntime.tasks.offlinemap.DownloadPreplannedOfflineMapJob;
import com.esri.arcgisruntime.tasks.offlinemap.DownloadPreplannedOfflineMapParameters;
import com.esri.arcgisruntime.tasks.offlinemap.DownloadPreplannedOfflineMapResult;
import com.esri.arcgisruntime.tasks.offlinemap.OfflineMapTask;
import com.esri.arcgisruntime.tasks.offlinemap.PreplannedMapArea;
import com.esri.arcgisruntime.tasks.offlinemap.PreplannedUpdateMode;

public class MainActivity extends AppCompatActivity implements ProgressDialogFragment.OnProgressDialogDismissListener {

  private static final String TAG = MainActivity.class.getSimpleName();

  private File mOfflineMapDirectory;

  private ListView mPreplannedAreasListView;
  private List<String> mPreplannedMapAreaNames;
  private ArrayAdapter<String> mPreplannedMapAreasAdapter;
  private ListView mDownloadedMapAreasListView;
  private List<String> mDownloadedMapAreaNames;
  private ArrayAdapter<String> mDownloadedMapAreasAdapter;
  private final List<ArcGISMap> mDownloadedMapAreas = new ArrayList<>();
  private Button mDownloadButton;

  private PreplannedMapArea mSelectedPreplannedMapArea;
  private List<PreplannedMapArea> mPreplannedMapAreas;
  private DownloadPreplannedOfflineMapJob mDownloadPreplannedOfflineMapJob;
  private MapView mMapView;
  private GraphicsOverlay mAreasOfInterestGraphicsOverlay;
  private OfflineMapTask mOfflineMapTask;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // delete any previous instances of downloaded maps
    deleteDirectory(getCacheDir());

    // create up a temporary directory in the app's cache for saving downloaded preplanned maps
    mOfflineMapDirectory = new File(getCacheDir() + getString(R.string.preplanned_offline_map_dir));
    if (mOfflineMapDirectory.mkdirs()) {
      Log.i(TAG, "Created directory for offline map in " + mOfflineMapDirectory.getPath());
    } else if (mOfflineMapDirectory.exists()) {
      Log.i(TAG,
          "Did not create a new offline map directory, one already exists at " + mOfflineMapDirectory.getPath());
    } else {
      Log.e(TAG, "Error creating offline map directory at: " + mOfflineMapDirectory.getPath());
    }

    // set the authentication manager to handle challenges when accessing the portal
    // Note: The sample data is publicly available, so you shouldn't be challenged
    AuthenticationManager.setAuthenticationChallengeHandler(new DefaultAuthenticationChallengeHandler(this));

    // create a portal to ArcGIS Online
    Portal portal = new Portal(getString(R.string.arcgis_online_url));
    // create a portal item using the portal and the item id of a map service
    PortalItem portalItem = new PortalItem(portal, getString(R.string.naperville_water_network_url));
    // create an offline map task from the portal item
    mOfflineMapTask = new OfflineMapTask(portalItem);
    // create a map with the portal item
    ArcGISMap onlineMap = new ArcGISMap(portalItem);
    // show the map
    mMapView = findViewById(R.id.mapView);
    mMapView.setMap(onlineMap);

    // create an offline map task for the portal item
    OfflineMapTask offlineMapTask = new OfflineMapTask(portalItem);

    // create a graphics overlay to show the preplanned map areas extents (areas of interest)
    mAreasOfInterestGraphicsOverlay = new GraphicsOverlay();
    mMapView.getGraphicsOverlays().add(mAreasOfInterestGraphicsOverlay);
    // create a red outline to mark the areas of interest of the preplanned map areas
    SimpleLineSymbol areaOfInterestLineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 5.0f);
    SimpleRenderer areaOfInterestRenderer = new SimpleRenderer();
    areaOfInterestRenderer.setSymbol(areaOfInterestLineSymbol);
    mAreasOfInterestGraphicsOverlay.setRenderer(areaOfInterestRenderer);

    createPreplannedAreasListView(onlineMap, offlineMapTask);

    createDownloadAreasListView();

    // create download button
    mDownloadButton = findViewById(R.id.downloadButton);
    mDownloadButton.setEnabled(false);
    mDownloadButton.setOnClickListener(view -> downloadPreplannedArea());
  }

  /**
   * Download the selected preplanned map area from the list view to a temporary directory. The download job is tracked in another list view.
   */
  private void downloadPreplannedArea() {
    if (mSelectedPreplannedMapArea != null) {
      // create default download parameters from the offline map task
      ListenableFuture<DownloadPreplannedOfflineMapParameters> offlineMapParametersFuture = mOfflineMapTask
          .createDefaultDownloadPreplannedOfflineMapParametersAsync(mSelectedPreplannedMapArea);
      offlineMapParametersFuture.addDoneListener(() -> {
        try {
          // get the offline map parameters
          DownloadPreplannedOfflineMapParameters offlineMapParameters = offlineMapParametersFuture.get();
          // set the update mode to not receive updates
          offlineMapParameters.setUpdateMode(PreplannedUpdateMode.NO_UPDATES);
          // create a job to download the preplanned offline map to a temporary directory
          mDownloadPreplannedOfflineMapJob = mOfflineMapTask.downloadPreplannedOfflineMap(offlineMapParameters,
              mOfflineMapDirectory.getPath() + File.separator + mSelectedPreplannedMapArea.getPortalItem().getTitle());
          // start the job
          mDownloadPreplannedOfflineMapJob.start();

          // show progress dialog for download, includes tracking progress
          showProgressDialog();

          // when the job finishes
          mDownloadPreplannedOfflineMapJob.addJobDoneListener(() -> {
            dismissDialog();
            // if there's a result from the download preplanned offline map job
            if (mDownloadPreplannedOfflineMapJob.getStatus() == Job.Status.SUCCEEDED) {
              DownloadPreplannedOfflineMapResult downloadPreplannedOfflineMapResult = mDownloadPreplannedOfflineMapJob
                  .getResult();
              if (mDownloadPreplannedOfflineMapJob != null && !downloadPreplannedOfflineMapResult.hasErrors()) {
                // get the offline map
                ArcGISMap offlineMap = downloadPreplannedOfflineMapResult.getOfflineMap();
                // add it to the map view
                mMapView.setMap(offlineMap);
                // add the map name to the list view of downloaded map areas
                mDownloadedMapAreaNames.add(offlineMap.getItem().getTitle());
                // select the downloaded map area
                mDownloadedMapAreasListView.setItemChecked(mDownloadedMapAreaNames.size() - 1, true);
                mDownloadedMapAreasAdapter.notifyDataSetChanged();
                // de-select the area in the preplanned areas list view
                mPreplannedAreasListView.clearChoices();
                mPreplannedMapAreasAdapter.notifyDataSetChanged();
                // add the offline map to a list of downloaded map areas
                mDownloadedMapAreas.add(offlineMap);
                // hide the area of interest graphics
                mAreasOfInterestGraphicsOverlay.setVisible(false);
                // disable the download button
                mDownloadButton.setEnabled(false);
              } else {
                // collect the layer and table errors into a single alert message
                StringBuilder stringBuilder = new StringBuilder("Errors: ");
                Map<Layer, ArcGISRuntimeException> layerErrors = downloadPreplannedOfflineMapResult.getLayerErrors();
                for (Map.Entry<Layer, ArcGISRuntimeException> layer : layerErrors.entrySet()) {
                  stringBuilder.append("Layer: ").append(layer.getKey().getName()).append(". Exception: ")
                      .append(layer.getValue().getMessage()).append(". ");
                }
                Map<FeatureTable, ArcGISRuntimeException> tableErrors = downloadPreplannedOfflineMapResult
                    .getTableErrors();
                for (Map.Entry<FeatureTable, ArcGISRuntimeException> table : tableErrors.entrySet()) {
                  stringBuilder.append("Table: ").append(table.getKey().getTableName()).append(". Exception: ")
                      .append(table.getValue().getMessage()).append(". ");
                }
                String error = "One or more errors occurred with the Offline Map Result: " + stringBuilder;
                Toast.makeText(this, error, Toast.LENGTH_LONG).show();
                Log.e(TAG, error);
              }
            } else {
              String error = "Job finished with an error: " + mDownloadPreplannedOfflineMapJob.getError();
              Toast.makeText(this, error, Toast.LENGTH_LONG).show();
              Log.e(TAG, error);
            }
          });
        } catch (InterruptedException | ExecutionException e) {
          String error = "Failed to generate default parameters for the download job: " + e.getCause().getMessage();
          Toast.makeText(this, error, Toast.LENGTH_LONG).show();
          Log.e(TAG, error);
        }
      });
    }
  }

  private void createPreplannedAreasListView(ArcGISMap onlineMap, OfflineMapTask offlineMapTask) {
    // create a list view which holds available preplanned map areas
    mPreplannedAreasListView = findViewById(R.id.availablePreplannedAreasListView);
    mPreplannedMapAreas = new ArrayList<>();
    mPreplannedMapAreaNames = new ArrayList<>();
    mPreplannedMapAreasAdapter = new ArrayAdapter<>(this, R.layout.item_map_area, mPreplannedMapAreaNames);
    mPreplannedAreasListView.setAdapter(mPreplannedMapAreasAdapter);
    // get the preplanned map areas from the offline map task and show them in the list view
    ListenableFuture<List<PreplannedMapArea>> preplannedMapAreasFuture = offlineMapTask.getPreplannedMapAreasAsync();
    preplannedMapAreasFuture.addDoneListener(() -> {
      try {
        // get the preplanned areas and add them to the list view
        mPreplannedMapAreas = preplannedMapAreasFuture.get();
        for (PreplannedMapArea preplannedMapArea : mPreplannedMapAreas) {
          mPreplannedMapAreaNames.add(preplannedMapArea.getPortalItem().getTitle());
        }
        mPreplannedMapAreasAdapter.notifyDataSetChanged();
        // load each area and show a red border around their area of interest
        for (PreplannedMapArea preplannedMapArea : mPreplannedMapAreas) {
          preplannedMapArea.loadAsync();
          preplannedMapArea.addDoneLoadingListener(() -> {
            if (preplannedMapArea.getLoadStatus() == LoadStatus.LOADED) {
              mAreasOfInterestGraphicsOverlay.getGraphics().add(new Graphic(preplannedMapArea.getAreaOfInterest()));
            } else {
              String error = "Failed to load preplanned map area: " + preplannedMapArea.getLoadError().getMessage();
              Toast.makeText(this, error, Toast.LENGTH_LONG).show();
              Log.e(TAG, error);
            }
          });
        }
        // on list view click
        mPreplannedAreasListView.setOnItemClickListener((adapterView, view, i, l) -> {
          mSelectedPreplannedMapArea = mPreplannedMapAreas.get(i);
          if (mSelectedPreplannedMapArea != null) {
            // show graphics overlay which highlights available preplanned map areas
            mAreasOfInterestGraphicsOverlay.setVisible(true);
            // clear the download jobs list view selection
            mDownloadedMapAreasListView.clearChoices();
            mDownloadedMapAreasAdapter.notifyDataSetChanged();
            // show the online map with the areas of interest
            mMapView.setMap(onlineMap);
            mAreasOfInterestGraphicsOverlay.setVisible(true);
            // set the viewpoint to the preplanned map area's area of interest
            Envelope areaOfInterest = GeometryEngine.buffer(mSelectedPreplannedMapArea.getAreaOfInterest(), 50)
                .getExtent();
            mMapView.setViewpointAsync(new Viewpoint(areaOfInterest), 1.5f);
            // enable download button only for those map areas which have not been downloaded already
            mDownloadButton.setEnabled(!new File(getCacheDir() + getString(R.string.preplanned_offline_map_dir) + File.separator
                    + mSelectedPreplannedMapArea.getPortalItem().getTitle()).exists());
          } else {
            mDownloadButton.setEnabled(false);
          }
        });
      } catch (InterruptedException | ExecutionException e) {
        String error = "Failed to get the Preplanned Map Areas from the Offline Map Task.";
        Toast.makeText(this, error, Toast.LENGTH_LONG).show();
        Log.e(TAG, error);
      }
    });
  }

  private void createDownloadAreasListView() {
    // create a list view which holds downloaded map areas
    mDownloadedMapAreasListView = findViewById(R.id.downloadedMapAreasListView);
    mDownloadedMapAreaNames = new ArrayList<>();
    mDownloadedMapAreasAdapter = new ArrayAdapter<>(this, R.layout.item_map_area, mDownloadedMapAreaNames);
    mDownloadedMapAreasListView.setAdapter(mDownloadedMapAreasAdapter);
    mDownloadedMapAreasListView.setOnItemClickListener((adapterView, view, i, l) -> {
      // set the downloaded map to the map view
      mMapView.setMap(mDownloadedMapAreas.get(i));
      // disable the download button
      mDownloadButton.setEnabled(false);
      // clear the available map areas list view selection
      mPreplannedAreasListView.clearChoices();
      mPreplannedMapAreasAdapter.notifyDataSetChanged();

      // hide the graphics overlays
      mAreasOfInterestGraphicsOverlay.setVisible(false);
    });
  }

  /**
   * Dismiss the dialog.
   */
  private void dismissDialog() {
    // dismiss progress dialog
    if (findProgressDialogFragment() != null) {
      findProgressDialogFragment().dismiss();
    }
  }

  /**
   * Show dialog and track progress.
   */
  private void showProgressDialog() {
    // show progress of the download preplanned offline map job in a dialog
    if (findProgressDialogFragment() == null) {
      ProgressDialogFragment progressDialogFragment = ProgressDialogFragment
          .newInstance("Download preplanned offline map job", "Downloading the requested preplanned map area...",
              "Cancel");
      progressDialogFragment.show(getSupportFragmentManager(), ProgressDialogFragment.class.getSimpleName());

      // track progress
      mDownloadPreplannedOfflineMapJob.addProgressChangedListener(() -> {
        if (findProgressDialogFragment() != null) {
          findProgressDialogFragment().setProgress(mDownloadPreplannedOfflineMapJob.getProgress());
        }
      });
    }
  }

  /**
   * Find and return the progress dialog fragment.
   *
   * @return the progress dialog fragment.
   */
  private ProgressDialogFragment findProgressDialogFragment() {
    return (ProgressDialogFragment) getSupportFragmentManager()
        .findFragmentByTag(ProgressDialogFragment.class.getSimpleName());
  }

  /**
   * Callback to cancel the download preplanned offline map job on progress dialog cancel button click.
   */
  @Override public void onProgressDialogDismiss() {
    if (mDownloadPreplannedOfflineMapJob != null) {
      mDownloadPreplannedOfflineMapJob.cancelAsync();
    }
  }

  /**
   * Recursively deletes all files in the given directory.
   *
   * @param dir to delete
   */
  private static boolean deleteDirectory(File dir) {
    if (dir != null && dir.isDirectory()) {
      String[] children = dir.list();
      for (String child : children) {
        boolean success = deleteDirectory(new File(dir, child));
        if (!success) {
          return false;
        }
      }
      return dir.delete();
    } else if (dir != null && dir.isFile()) {
      return dir.delete();
    } else {
      return false;
    }
  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    mMapView.dispose();
    super.onDestroy();
  }
}