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这是我用来从 Flutter 中的实时数据库中检索数据的代码，但它不起作用。

此行在 main.dart 中声明

DatabaseReference = newRequestRef=FirebaseDatabase.instance.reference().child("Ride Requests");

class PushNotifcationService {

  final FirebaseMessaging firebaseMessaging = FirebaseMessaging();

  Future initialize() async

  {
    firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        retrieveRideRequestInfo(getRideRequestId(message));
        //Open the app and waits to see the ruquest

      },

      onLaunch: (Map<String, dynamic> message) async {
        // will be launched after clicking notifications
        retrieveRideRequestInfo(getRideRequestId(message));

      },
      onResume: (Map<String, dynamic> message) async {
        //If driver is using any other APP , on resume will notify the the driver
        retrieveRideRequestInfo(getRideRequestId(message));

      },
    );
  }


  Future<String> getToken() async {
    String token = await firebaseMessaging.getToken();
    print("This is Token::");
    print(token);
    driversRef.child(currentFirebaseUser.uid).child("token").set(token);

    firebaseMessaging.subscribeToTopic("alldrivers");
    firebaseMessaging.subscribeToTopic("allusers");
  }

  String getRideRequestId(Map<String, dynamic> message) {
    String rideRequestId = "";
    if (Platform.isAndroid) {
      rideRequestId = message['data']['ride_request_id'];

    }
    else {
      rideRequestId = message['ride_request_id'];


    }

    return rideRequestId;
  }

  void retrieveRideRequestInfo(String rideRequestId) {
    newRequestRef.child(rideRequestId).once().then((DataSnapshot dataSnapShot) {

if(dataSnapShot.value != null) {
  double pickUpLocationLat = double.parse(
      dataSnapShot.value['pickup']['latitude']);
  double pickUpLocationLng = double.parse(
      dataSnapShot.value['pickup']['longitude']);
  String pickUpAddress = dataSnapShot.value['pickup_address'].toString();

  double dropOffLocationLat = double.parse(
      dataSnapShot.value['dropOff']['latitude:']);
  double dropOffLocationLng = double.parse(
      dataSnapShot.value['dropOff']['longitude']);
  String dropOffAddress = dataSnapShot.value['dropOff_address'].toString();

  String paymentMethod = dataSnapShot.value['payment_method'].toString();


  RideDetails rideDetails = RideDetails();

  rideDetails.ride_request_id = rideRequestId;
  rideDetails.pickup_address = pickUpAddress;
  rideDetails.pickup_address = dropOffAddress;
  rideDetails.pickup = LatLng(pickUpLocationLat, pickUpLocationLng);
  rideDetails.dropOff = LatLng(dropOffLocationLat, dropOffLocationLng);

  rideDetails.payment_method = paymentMethod;


  print("Information::");
  print(rideDetails.pickup_address);
  print(rideDetails.dropOff_address);
}

    });
  }
}

现在，我无法在控制台中打印乘车详细信息。您能帮帮我吗？

我附上了一张图片来查看我的实时数据库在此处输入图片描述

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