相关疑难解决方法(0)

我的想法： 我想在 Flutter 中使用 Firebase Auth 插件来注册用户。但在他们可以访问应用程序之前，他们必须验证他们的电子邮件地址。因此，我在注册后将 Firebase 用户推送到验证屏幕。这只是一个加载屏幕，告诉用户他必须验证他的电子邮件。

但是现在：如果用户的电子邮件是否经过验证并将他（如果为真）发送到主屏幕，我该如何持续收听？

我是 Flutter 的新手，我不知道我是否必须使用 Streams 或 Observables 或 while Loop 或 setState() 或其他东西来进行这样的布尔检查。而且我也不知道如何设置解决方案。

这是我注册用户的基本代码：

import 'package:cloud_firestore/cloud_firestore.dart';
import 'dart:async';

class AuthService {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final Firestore _db = Firestore.instance;

  Future<FirebaseUser> get getUser => _auth.currentUser();

  Stream<FirebaseUser> get user => _auth.onAuthStateChanged;

  Future<FirebaseUser> edubslogin(String email, String password) async {
    try {
      final FirebaseUser user = await _auth.createUserWithEmailAndPassword(
        email: email,
        password: password,
      );
     
      await user.sendEmailVerification();
      
      //email verification somewhere here
    
      updateUserData(user);
      return user; …

我有一个小部件，它向返回地图的api发出请求。我想做的是每次加载小部件并将列表保存到appState.myList时都不会发出相同的请求，但是当我在中执行此操作时appState.myList = snapshot.data;，FutureBuilder出现以下错误：

flutter: ??? EXCEPTION CAUGHT BY FOUNDATION LIBRARY ????????????????????????????????????????????????????????? flutter: The following assertion was thrown while dispatching notifications for MySchedule: flutter: setState() or markNeedsBuild() called during build. flutter: This ChangeNotifierProvider<MySchedule> widget cannot be marked as needing to build because the flutter: framework is already in the process of building widgets. A widget can be marked as needing to be flutter: built during the build phase only if one of its ancestors is …