Take a map offline using a 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
ArcGISMapfrom aPortalItemand display it. - Create an
OfflineMapTaskusing the portal item. - Get the
PreplannedMapAreas from the task, and then load them. - To download a selected map area, create the default
DownloadPreplannedOfflineMapParametersfrom 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
DownloadPreplannedOfflineMapJobfrom the task. - Start the job. Once it has completed, get the
DownloadPreplannedOfflineMapResult. - Get the
ArcGISMapfrom the result and display it in theMapView.
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.
Tags
map area, offline, pre-planned, preplanned
Sample Code
/*
* 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();
}
}