Display an offline map (on demand)

Learn how to download and display an offline map for a user-defined geographical area of a web map.

display an offline map on demand

Offline maps allow users to continue working when network connectivity is poor or lost. If a web map is enabled for offline use, a user can request that ArcGIS generates an offline map for a specified geographic area of interest.

In this tutorial, you will download an offline map for an area of interest from the web map of the stormwater network within Naperville, IL, USA. You can then use this offline map without a network connection.

Prerequisites

The following are required for this tutorial:

  1. An ArcGIS account to access API keys. If you don't have an account, sign up for free.
  2. Your system meets the system requirements.
  3. The ArcGIS Runtime API for Qt is installed.

Steps

Get the web map item ID

You can use ArcGIS tools to create and view web maps. Use the Map Viewer to identify the web map item ID. This item ID will be used later in the tutorial.

  1. Go to the Naperville water network in the Map Viewer in ArcGIS Online. This web map displays stormwater network within Naperville, IL, USA.
  2. Make a note of the item ID at the end of the browser's URL.

    The item ID should be acc027394bc84c2fb04d1ed317aac674

Create a new ArcGIS Runtime Qt Creator Project

  1. Launch Qt Creator and create a new project. Under Choose a Template, select Qt Quick C++ app project for the latest version of ArcGIS Runtime installed.

  2. Name your project Display_an_offline_map.

  3. Accept all defaults. At the Define Project Details window, leave the ArcGIS Online Basemap selection as is. Complete the project creation.

Set your API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

Display the web map

You can display a web map using the web map's item ID. Create a map from the web map portal item, and display it in your app.

  1. In Projects, double-click Headers > Display_an_offline_map.h to open the file. Add the following classes to the header file.

    Display_an_offline_map.h
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    namespace ArcGISRuntime
    {
    class Map;
    class MapQuickView;
    
    class PortalItem;
    class OfflineMapTask;
    
  2. Add the generateMapByExtent() function declaration and member variables m_portalItem and m_offlineMapTask. Save and close the file.

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    private:
        Esri::ArcGISRuntime::MapQuickView* mapView() const;
        void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);
    
        void generateMapByExtent();
    
        Esri::ArcGISRuntime::Map* m_map = nullptr;
        Esri::ArcGISRuntime::MapQuickView* m_mapView = nullptr;
    
        Esri::ArcGISRuntime::PortalItem* m_portalItem = nullptr;
        Esri::ArcGISRuntime::OfflineMapTask* m_offlineMapTask = nullptr;
    
  3. In Projects, double-click Sources > Display_an_offline_map.cpp to open the file. Remove the #include statements for Basemap and QUrl.

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    #include "Basemap.h"
    
    #include "Map.h"
    #include "MapQuickView.h"
    
    #include <QUrl>
    
    using namespace Esri::ArcGISRuntime;
    
  4. Add the following #include statements.

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    #include "Display_an_offline_map.h"
    #include "Map.h"
    #include "MapQuickView.h"
    
    #include "OfflineMapTask.h"
    #include "Envelope.h"
    #include "EnvelopeBuilder.h"
    #include "GenerateOfflineMapJob.h"
    #include "GraphicsOverlay.h"
    #include "SimpleFillSymbol.h"
    #include "SimpleLineSymbol.h"
    #include <QDir>
    
  5. Remove the Map from the constructor and also delete the comma after QObject(parent).

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    Display_an_offline_map::Display_an_offline_map(QObject* parent /* = nullptr */):
        QObject(parent),
    
        m_map(new Map(BasemapStyle::ArcGISStreets, this))
  6. Instantiate a Portal and from that, a PortalItem using the web map item ID for the Naperville water network. Use that to create a new Map. Then create a new OfflineMapTask referencing that portal item.

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    Display_an_offline_map::Display_an_offline_map(QObject* parent /* = nullptr */):
        QObject(parent)
    {
    
        Portal* portal = new Portal(false, this);
        m_portalItem = new PortalItem(portal, "acc027394bc84c2fb04d1ed317aac674", this);
        m_map = new Map(m_portalItem, this);
        m_offlineMapTask = new OfflineMapTask(m_portalItem, this);
    
  7. Press <Ctrl+R> to run the app.

    You should see a map of the stormwater network within Naperville, IL, USA. Use the mouse to drag, scroll, and double-click the map view to explore the map.

Specify the area of the web map to take offline

  1. Add the call to generateMapByExtent. (The next step implements this function.)

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    // Set the view (created in QML)
    void Display_an_offline_map::setMapView(MapQuickView* mapView)
    {
        if (!mapView || mapView == m_mapView)
        {
            return;
        }
    
        m_mapView = mapView;
        m_mapView->setMap(m_map);
    
        generateMapByExtent();
    
  2. Begin to implement the generateMapByExtent() function. Use EnvelopeBuilder to set four parameters and then call toGeometry to create the envelope.

    Display_an_offline_map.cpp
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    // Set the view (created in QML)
    void Display_an_offline_map::setMapView(MapQuickView* mapView)
    {
        if (!mapView || mapView == m_mapView)
        {
            return;
        }
    
        m_mapView = mapView;
        m_mapView->setMap(m_map);
    
        generateMapByExtent();
    
        emit mapViewChanged();
    }
    
    void Display_an_offline_map::generateMapByExtent()
    {
        // Create envelope to define area of interest
        EnvelopeBuilder* envelopeBuilder = new EnvelopeBuilder(SpatialReference::wgs84(), this);
    
        envelopeBuilder->setXMin(-88.1526);
        envelopeBuilder->setXMax(-88.1490);
        envelopeBuilder->setYMin(41.7694);
        envelopeBuilder->setYMax(41.7714);
    
        Envelope offlineArea = envelopeBuilder->toGeometry();
    
        // generate the offline map parameters
        m_offlineMapTask->createDefaultGenerateOfflineMapParameters(offlineArea);
    }
    
  3. Add a graphic to generateMapByExtent() to show the area you will take offline.

    Create a Graphic using the envelope, SimpleFillSymbol and SimpleLineSymbol. From this create a GraphicsOverlay and add it to the mapView.

    Display_an_offline_map.cpp
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    void Display_an_offline_map::generateMapByExtent()
    {
        // Create envelope to define area of interest
        EnvelopeBuilder* envelopeBuilder = new EnvelopeBuilder(SpatialReference::wgs84(), this);
    
        envelopeBuilder->setXMin(-88.1526);
        envelopeBuilder->setXMax(-88.1490);
        envelopeBuilder->setYMin(41.7694);
        envelopeBuilder->setYMax(41.7714);
    
        Envelope offlineArea = envelopeBuilder->toGeometry();
    
        Graphic* box = new Graphic(offlineArea, new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, Qt::transparent, new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, Qt::red, 3, this), this), this);
        GraphicsOverlay* boxOverlay = new GraphicsOverlay(this);
        boxOverlay->graphics()->append(box);
    
        // add graphics overlay to the map view
        m_mapView->graphicsOverlays()->append(boxOverlay);
    
        // generate the offline map parameters
        m_offlineMapTask->createDefaultGenerateOfflineMapParameters(offlineArea);
    }
    
  4. Press <Ctrl+R> to run the app.

    You should see a red outline on the stormwater network within Naperville, IL, USA. This indicates the area of the web map that you are going to take offline.

Download and display the offline map

  1. Add the following connect function that creates a GenerateOfflineMapJob. This executes after createDefaultGenerateOfflineMapParametersCompleted is issued. Store the resulting offline mobile map package (MMPK) at a desired local folder. Don't add a closing brace yet.

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        Graphic* box = new Graphic(offlineArea, new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, Qt::transparent, new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, Qt::red, 3, this), this), this);
        GraphicsOverlay* boxOverlay = new GraphicsOverlay(this);
        boxOverlay->graphics()->append(box);
    
        // add graphics overlay to the map view
        m_mapView->graphicsOverlays()->append(boxOverlay);
    
        // use connect to run generate offline map job after offline map parameters are created. Store the resulting mmpk in the desired path
        connect(m_offlineMapTask, &OfflineMapTask::createDefaultGenerateOfflineMapParametersCompleted, this, [this](QUuid, const GenerateOfflineMapParameters& params)
        {
            const QString outputPath = QDir::homePath() + "/ArcGIS/Runtime/Data/offlinemap.mmpk";
            GenerateOfflineMapJob* generateJob = m_offlineMapTask->generateOfflineMap(params, outputPath);
            if (!generateJob)
                return;
    
    Expand
  2. Add another connect that monitors the status of the GenerateOfflineMapJob and returns changes to status.

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        // use connect to run generate offline map job after offline map parameters are created. Store the resulting mmpk in the desired path
        connect(m_offlineMapTask, &OfflineMapTask::createDefaultGenerateOfflineMapParametersCompleted, this, [this](QUuid, const GenerateOfflineMapParameters& params)
        {
            const QString outputPath = QDir::homePath() + "/ArcGIS/Runtime/Data/offlinemap.mmpk";
            GenerateOfflineMapJob* generateJob = m_offlineMapTask->generateOfflineMap(params, outputPath);
            if (!generateJob)
                return;
    
            // use connect to monitor job status for changes and return job status
            connect(generateJob, &GenerateOfflineMapJob::jobStatusChanged, this, [this, generateJob]()
            {
                if (generateJob->jobStatus() == JobStatus::Succeeded)
                {
                    qDebug() << "generating offline map";
                    m_mapView->setMap(generateJob->result()->offlineMap(this));
    
                    qDebug() << (generateJob->error().isEmpty() ? "No errors" : (generateJob->error().message() + generateJob->error().additionalMessage()));
                }
    
                else if (generateJob->jobStatus() == JobStatus::Failed)
                {
                    qWarning() << generateJob->error().message() << generateJob->error().additionalMessage();
                }
            });
    
    Expand
  3. Add a final connect (optional) that displays progress of the GenerateOfflineMapJob as the job executes. Add the final code generateJob->start() and the final closing code (required) to complete the first connect function.

    Display_an_offline_map.cpp
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            // use connect to monitor job status for changes and return job status
            connect(generateJob, &GenerateOfflineMapJob::jobStatusChanged, this, [this, generateJob]()
            {
                if (generateJob->jobStatus() == JobStatus::Succeeded)
                {
                    qDebug() << "generating offline map";
                    m_mapView->setMap(generateJob->result()->offlineMap(this));
    
                    qDebug() << (generateJob->error().isEmpty() ? "No errors" : (generateJob->error().message() + generateJob->error().additionalMessage()));
                }
    
                else if (generateJob->jobStatus() == JobStatus::Failed)
                {
                    qWarning() << generateJob->error().message() << generateJob->error().additionalMessage();
                }
            });
    
            // use connect to monitor job progress changes and return progress return job progress
            connect(generateJob, &GenerateOfflineMapJob::progressChanged, this, [generateJob]()
            {
                qDebug() << "Job status:" << generateJob->progress() << "%";
            });
    
            generateJob->start();
        });
    
    Expand
  4. Press <Ctrl+R> to run the app.

Initially, you should see the map of the stormwater network for Naperville, IL, USA, with a red outline as before. At the Application Output tab in Creator, the Job status percentage should increment up to 100%, and then you should see the offline map for the specified area of the stormwater network for Naperville, IL, USA. Remove your network connection and you will still be able to use the mouse to drag, scroll, and double-click the map view to explore this offline map.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

Not all tutorials are currently available for QML.

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