Basemap and layers are displayed only on the second run

MassimoMazzanti — Fri, 22 May 2020 12:38:37 GMT

I'am developing a .NET C# Android app, that start with a SplahAcitivity that calls the MainActivity module.

In the MainAcitivity I load a MapView component, inside a LinearLayout, declared in Main.xml,

The App compiles correctly, but at first run (in both debug and release version) the basemap and a feature layer are not displayed. The MapView area is completely empty (light blue color).

All the other times I run the application the basemap and the feature layer are displayed correctly.

I have tried to modify the code in various ways but without any positive results.

Do you have any ideas?

A piece of Main.xml:

...

<Esri.ArcGISRuntime.UI.Controls.MapView
android:id="@+id/MyMapView"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />

...

Some lines of MainActivity.cs module are shown below:

...

public class MainActivity : AppCompatActivity
{
MapViewModel _mapViewModel = new MapViewModel();
MapView _mapView;

protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);

SetContentView(Resource.Layout.Main);

Initialize();

}

private void Initialize()

{

...

SetContentView(Resource.Layout.Main);

_mapView = FindViewById<MapView>(Resource.Id.MyMapView);
_mapView.Map = _mapViewModel.Map;

Esri.ArcGISRuntime.Mapping.Map myMap = new Esri.ArcGISRuntime.Mapping.Map(Basemap.CreateStreets());
Envelope initialLocation = new Envelope(720000.0, 4942000.0, 1940000.0, 5900000.0, SpatialReferences.WebMercator);
myMap.InitialViewpoint = new Viewpoint(initialLocation);

// Assign the map to the MapView
_mapView.Map = myMap;

...

}

...

}

And this is the MapViewModel class declared in MapViewModel.cs

public class MapViewModel : INotifyPropertyChanged
{
public MapViewModel()
{

}

private Esri.ArcGISRuntime.Mapping.Map _map = new Esri.ArcGISRuntime.Mapping.Map(Basemap.CreateStreets());

public Esri.ArcGISRuntime.Mapping.Map Map
{
get { return _map; }
set { _map = value; OnPropertyChanged(); }
}

protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
var propertyChangedHandler = PropertyChanged;
if (propertyChangedHandler != null)
propertyChangedHandler(this, new PropertyChangedEventArgs(propertyName));
}

public event PropertyChangedEventHandler PropertyChanged;
}

Many thanks.

Best Regards

Massimo

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Basemap and layers are displayed only on the second run