Display device location

Learn how to display the current device location on a map or scene.

You can display the device location on a map or scene. This is important for workflows that require the user's current location, such as finding nearby businesses, navigating from the current location, or identifying and collecting geospatial information.

By default, location display uses the device's location provider. Your app can also process input from other location providers, such as an external GPS receiver or a provider that returns a simulated location. For more information, see the Show device location topic.

Prerequisites

Steps

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_device_location.

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.

1. In the Projects window, in the Sources folder, open the main.cpp file. Modify the code to set the API key. Paste the API key, acquired from your dashboard, between the quotes. Then save and close the file.

   main.cpp

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       // 2. API key: A permanent key that gives your application access to Esri
       // location services. Create a new API key or access existing API keys from
       // your ArcGIS for Developers dashboard (https://links.esri.com/arcgis-api-keys).
   
       const QString apiKey = QString("");
   

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Declare the new method in the header file

1. In the Projects window, open the Headers folder. Double-click the file display_device_location.h to open it. Add the new method declaration under private:. Then save and close the file.

   Display_device_location.h

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   private:
       Esri::ArcGISRuntime::MapQuickView* mapView() const;
       void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);
   
       void startLocation();
   

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Show the current location

Each map view has its own instance of a LocationDisplay for showing the current location (point) of the device. The location is displayed as an overlay in the map view.

1. In the Projects window, open the Sources folder. Open the display_device_location.cpp file and add the new method shown. This code enables LocationDisplay for the map view and assigns a LocationDisplayAutoPanMode that centers the map at the device location.

   Display_device_location.cpp

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   MapQuickView* Display_device_location::mapView() const
   {
       return m_mapView;
   }
   
   void Display_device_location::startLocation()
   {
       // start location display
       m_mapView->locationDisplay()->start();
       // center the location display around the device location
       m_mapView->locationDisplay()->setAutoPanMode(LocationDisplayAutoPanMode::Recenter);
   }
   

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   More info

   The setMapView method appearing later in this file gets a handle to the MapView object that was declared in QML code and sets the Map on the MapView for display. This code is installed by the templates that ArcGIS provides when creating a new project in Qt.

2. Within the setMapView method, add the call to the new method.

   Display_device_location.cpp

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   // Set the view (created in QML)
   void Display_device_location::setMapView(MapQuickView* mapView)
   {
       if (!mapView || mapView == m_mapView)
       {
           return;
       }
   
       m_mapView = mapView;
       m_mapView->setMap(m_map);
   
       startLocation();
   

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3. Remove the following include statements; these classes are not used.

   Display_device_location.cpp

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   #include "Basemap.h"
   
   #include "Map.h"
   #include "MapQuickView.h"
   
   #include <QUrl>
   

4. Press Ctrl + R to run the app.

You should see your current location displayed on the map. Different location symbols are used depending on the auto pan mode and whether a location is acquired. See LocationDisplayAutoPanMode for details.

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

Not all tutorials listed have instructions for QML.

• Add a feature layer
• Search for an address
• Find a route and directions
• Display a web map
• Display a scene