Can't pass currentLocation to my initial cameraPosition in "map_view"

[morad00]

What I need:

• Set the current location to the initial camerPosition in map_view
• Set a draggable marker starts in the current location

What problem I faced:

• My currentLocation always waiting and returns null
  currentLocation = await userLocation.getLocation;

My async method

Future _pickPlace() async {
    var getPresentLocation;
    try {
      getPresentLocation = await userLocation.getLocation;
      error = null;
    } on PlatformException catch (e) {
      if (e.code == 'PERMISSION_DENIED') {
        error = 'Permission denied';
      } else if (e.code == 'PERMISSION_DENIED_NEVER_ASK') {
        error = 'Permission denied - please ask the user to enable it from the app settings';
      }
      getPresentLocation = null;
    }
    print('current location = ${getPresentLocation}');
  

map_view .show() method

mapView.show(
      MapOptions(
        showUserLocation: true,
        title: "Choose a place",
        initialCameraPosition: CameraPosition(
            locMapView.Location(getPresentLocation["latitude"],
                getPresentLocation['longitude']),
            15.0),
      ),
      toolbarActions: <ToolbarAction>[
        ToolbarAction("Close", 1),
      ]);

  mapView.onToolbarAction.listen((id) {
    if (id == 1) {
      print('1');
      mapView.dismiss();
    }
  });

  mapView.addMarker(new Marker(
    "1",
    "Pick up place!",
    getPresentLocation["latitude"],
    getPresentLocation['longitude'],
    draggable: true,
  ));

Any ideas ?