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![State.initState() 必须是没有async关键字的 void 方法。我该如何解决这个问题] 1

@override
  Future<void> initState() async {
    // TODO: implement initState
    super.initState();
    _current_location();
    BitmapDescriptor.fromAssetImage(
        ImageConfiguration(devicePixelRatio: 2.5),
        'assets/fff.png').then((onValue) {
      pinLocationIcon = onValue;
    });
    //createCustomMarker(context);

   // final Marker marker = Marker(icon: BitmapDescriptor.fromBytes(markerIcon));
    DatabaseReference ref = FirebaseDatabase.instance.reference();
    ref.child('users').once().then((DataSnapshot snapshot) {
      Map<dynamic, dynamic> values = snapshot.value;
      print(values.toString());
      values.forEach((k, v) {
        allMarkers.add(Marker(
          markerId: MarkerId(k),
          draggable: false,
          icon: pinLocationIcon,
          position: LatLng(v["latitude"], v["longitude"]),
          infoWindow: InfoWindow(title: v["name"]),
          onTap: () {
            _onMarkerTapped(v["name"]);
          },
        ),);
      });
    });
  }