Flutter 出现一个或多个验证错误，状态：400

我真的有问题，与

httppost

我正试图张贴一个登记表TextField，但我一直有很多问题与之。。现在我正在使用提供者，下面是我的代码：

import 'dart:convert';
import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:logistics_app/models/registerApi.dart';
import 'package:logistics_app/ui/dashboard_view.dart';
import 'package:logistics_app/utils/validation.dart';
import 'package:http/http.dart' as http;

import '../ui/login_view.dart';



class UserOnboardingModel extends ChangeNotifier with ValidationMixin{

  TextEditingController firstController = TextEditingController();
  TextEditingController lastController = TextEditingController();
  TextEditingController passwordController = TextEditingController();
  TextEditingController emailController = TextEditingController();
  TextEditingController phoneController = TextEditingController();
  bool showPassword = true;

  final formKey = GlobalKey<FormState>();

  Future<RegisterModel> _futureRegister;

  Future<RegisterModel> createRegister()async{;
    final http.Response response = await http.post(
        "apiKey",
        headers: {'content-type': 'application/json',
          'Accept': 'application/json',
          'Authorization': 'Some token'
        },
        body: jsonEncode(<String, String>{
          'firstName' : validateFirstName(firstController.text),
          'lastName' : validateLastName(lastController.text),
          'emailAddress' : validateEmail(emailController.text),
          'phoneNumber' : validatePhoneNumber(phoneController.text),
          'password' : validatePassword(passwordController.text)
        })
    );
    if(response.statusCode < 200 || response.statusCode >= 400){
      print(json.decode(response.body));
      return RegisterModel.fromJson(json.decode(response.body));
    }else{
      print(response.statusCode);
      throw Exception('Failed to create Register');
    }
  }

  void passRegister(){
    _futureRegister = createRegister();
  }

  void registerForm(){
    FutureBuilder<RegisterModel>(
      future: _futureRegister,
      builder: (context, snapshot){
        if(snapshot.hasData){
          return Column(
            children: [
              Text(snapshot.data.firstName),
              Text(snapshot.data.lastName),
              Text(snapshot.data.emailAddress),
              Text(snapshot.data.phoneNumber),
              Text(snapshot.data.password)
            ],
          );
        }else if(snapshot.hasError){
          return Text("${snapshot.error}");
        }
        return CircularProgressIndicator();
      },
    );
  }

  void togglePassword(){
    showPassword = !showPassword;
    notifyListeners();
  }

  void validateForm(){
    formKey.currentState.validate();
  }

  void moveToLogin(context){
    //go to login page
    if(formKey.currentState.validate()){
      Navigator.pushNamed(context, LogIn.LOG_IN_ROUTE);
    }
    else{
      Fluttertoast.showToast(
          msg: "Please Fill The Form",
          toastLength: Toast.LENGTH_LONG,
          gravity: ToastGravity.BOTTOM,
        timeInSecForIosWeb: 5,
        backgroundColor: Colors.black,
      );
    }
  }

  void moveToDashBoardView(context){
    //go to login page
    if(formKey.currentState.validate()){
      Navigator.push(context, MaterialPageRoute(
          builder: (context) => DashboardView()
      ));
    }
    else{
      Fluttertoast.showToast(
        msg: "Please Fill The Form",
        toastLength: Toast.LENGTH_LONG,
        gravity: ToastGravity.BOTTOM,
        timeInSecForIosWeb: 5,
        backgroundColor: Colors.black,
      );
    }
  }

  void moveToSignup(){
    //go to sign up page
    notifyListeners();
  }
  void moveToForgottenPassword(){
    //go to forgotten password page
    notifyListeners();
  }

}

---

您是否可以发布您使用该提供商的注册页面ui。

    W/IInputConnectionWrapper(13401): beginBatchEdit on inactive InputConnection
W/IInputConnectionWrapper(13401): getTextBeforeCursor on inactive InputConnection
W/IInputConnectionWrapper(13401): getTextAfterCursor on inactive InputConnection
W/IInputConnectionWrapper(13401): getSelectedText on inactive InputConnection
W/IInputConnectionWrapper(13401): endBatchEdit on inactive InputConnection
I/flutter (13401): {type: https://tools.ietf.org/html/rfc7231#section-6.5.1, title: One or more validation errors occurred., status: 400, traceId: |413e7730-4dae4ee449b12286., errors: {LastName: ['Last Name' must not be empty.], FirstName: ['First Name' must not be empty.], PhoneNumber: ['Phone Number' must not be empty.], EmailAddress: ['Email Address' must not be empty.]}}