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
