未来<void>.value();

Question

我在运行应用程序时遇到问题。初始化应用程序后，我无法同时正确地看到屏幕，出现错误显示 **Future.value();在 Feedback.dart 内。我尝试捕获我添加的任何错误，但找不到任何错误。

我见过很多解决方案也尝试过但没有成功。有人可以告诉我下面显示的错误吗？

这是登录页面文件：

import 'package:flutter/material.dart';
import 'package:food_app/bottombar/screenA.dart';


class LoginPage extends StatefulWidget {
  const LoginPage({super.key});

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {

  static Future<User?>loginUsingEmailPassword({required String email, required String password, required BuildContext context}) async {
    FirebaseAuth auth = FirebaseAuth.instance;
    User? user;
    try {
      UserCredential userCredential = await auth.signInWithEmailAndPassword(email: email, password: password);
      user = userCredential.user;

    } on FirebaseAuthException catch (e) {
      if(e.code == "user not found"){
        print("No User found for that email");
      }
    }

    return user;
  }


  @override
  Widget build(BuildContext context) {

    TextEditingController emailController = TextEditingController();
    TextEditingController passwordController = TextEditingController();
    return Scaffold(
      appBar: AppBar(
        title: const Text("Hello world"),
      ),

      body: SizedBox(
        height: 400.0,
        child: Column(
          children: [
              Padding(
                padding: const EdgeInsets.all(15.0),
                child: TextFormField(
                  controller: emailController,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    hintText: "Enter Username",
                  ),
                ),
              ),
              const SizedBox(
                height: 20.0,
              ),
              Padding(
                padding: const EdgeInsets.all(15.0),
                child: TextFormField(
                  controller: passwordController,
                  obscureText: true,
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    hintText: "Enter Password",
                  ),
                ),
              ),
              const SizedBox(
                height: 20.0,
              ),
              ElevatedButton(
                onPressed: () async{
                    User? user = await loginUsingEmailPassword(email: emailController.text, password: passwordController.text, context: context);
                     print(user);
                     if (user != null) {
                      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (context) => const ScreenA()));
                     }
                }, 
                
                
                child: const Text("Login")),
             
          ],
        ),
      ),
    );
  }
}

这是 main.dart 文件：

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:food_app/loginpage.dart';


void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}


class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  Future<FirebaseApp> _initializeFirebase() async {
    FirebaseApp firebaseApp = await Firebase.initializeApp();
    return firebaseApp;


  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder(
        future: _initializeFirebase(),
        builder:  (context, snapshot){
          if(snapshot.connectionState == ConnectionState.done) {
            return const LoginPage();
          }
          return const Center(
            child: CircularProgressIndicator(),
          );
        },
      ),
    );
  }
}

我的错误是：

    context.findRenderObject()!.sendSemanticsEvent(const TapSemanticEvent());
    switch (_platform(context)) {
      case TargetPlatform.android:
      case TargetPlatform.fuchsia:
        return SystemSound.play(SystemSoundType.click);
      case TargetPlatform.iOS:
      case TargetPlatform.linux:
      case TargetPlatform.macOS:
      case TargetPlatform.windows:
        return Future<void>.value();
    }
  }

Answer 1

最终的emptyFuture = Future.value();

如果出现这样的错误，只需关闭调试断点上的未捕获异常即可