googleMapWidget.dart

CameraPosition _initialPosition = CameraPosition(target: LatLng(26.8206, 30.8025));
Completer<GoogleMapController> _controller = Completer();


void _onMapCreated(GoogleMapController controller) {
    _controller.complete(controller);
}

@override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Maps in Flutter'),
          centerTitle: true,
        ),
        body: Stack(
          children: <Widget>[
            GoogleMap(    
              onMapCreated: _onMapCreated,
              initialCameraPosition: _initialPosition,
            ),
          ],
        ));
  }