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如何计算飞镖中两个位置之间的距离？

我正在尝试将谷歌地图集成到我的应用程序中，并为其提供放置标记的源和目的地。这几天一直正常运行，没有出现任何错误。今天突然出现此错误，并且地图无法正常工作。即使它没有在屏幕上显示谷歌地图，只是空白的白色屏幕。

class MapView extends StatefulWidget {
  @override
  _MapViewState createState() => _MapViewState();
}

class _MapViewState extends State<MapView> {
  CameraPosition _initialLocation = CameraPosition(target: LatLng(0.0, 0.0));
  **late GoogleMapController mapController ;**

  late Position _currentPosition;
  String _currentAddress = '';

  final startAddressController = TextEditingController();
  final destinationAddressController = TextEditingController();

  final startAddressFocusNode = FocusNode();
  final destinationAddressFocusNode = FocusNode();

  String _startAddress = '';
  String _destinationAddress = '';
  double? _placeDistance;

  Set<Marker> markers = {};

  late PolylinePoints polylinePoints;
  List<LatLng> polylineCoordinates = [];
  Map<PolylineId, Polyline> polylines = {};

  final _scaffoldKey = GlobalKey<ScaffoldState>(); …

Flutter 有没有办法获取两个位置之间的距离？