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Flutter中Firebase Realtime Database无响应问题求助

avatar
数据老陈
2026-7-26

相关截图

原代码 

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/material.dart';

import '../app settings/text sittings.dart';
import '../screens.dart';

// ignore: must_be_immutable
class SignUpPage extends StatefulWidget {
 const SignUpPage({Key? key}) : super(key: key);

 @override
 State<SignUpPage> createState() => _SignUpPageState();
}

class _SignUpPageState extends State<SignUpPage> {
 final namecontroller = TextEditingController();
 final emailcontroller = TextEditingController();
 final passwodconttroler = TextEditingController();
 final conformpasswodconttroler = TextEditingController();

 GlobalKey<FormState> formstate = GlobalKey<FormState>();
 final database = FirebaseDatabase.instance;

 Future signUp() async {
   var formdata = formstate.currentState;
   if (formdata!.validate()) {
     formdata.save();
     if (passwordconfirmed()) {
       try {
         final User? credential =
             (await FirebaseAuth.instance.createUserWithEmailAndPassword(
           email: emailcontroller.text,
           password: passwodconttroler.text,
         ))
                 .user;
         return credential;
       } on FirebaseAuthException catch (e) {
         if (e.code == 'weak-password') {
           AwesomeDialog(
               context: context,
               dialogType: DialogType.warning,
               animType: AnimType.bottomSlide,
               title: 'Week Password',
               body: const Text(
                 "The password is too weak",
               )).show();
         } else if (e.code == 'email-already-in-use') {
           AwesomeDialog(
               context: context,
               dialogType: DialogType.warning,
               animType: AnimType.bottomSlide,
               title: 'Week Password',
               body: const Text(
                 "The account already exists for that email",
               )).show();
         }
         return null;
       } catch (e) {
         print(e);
       }
     }
   }
   if (signUp() != null) {
     DatabaseReference ref = FirebaseDatabase.instance.ref("name");
     await ref.child("id").push().set({
       "id": FirebaseAuth.instance.currentUser?.uid,
       "name": namecontroller.text,
       "email": emailcontroller.text,
     });
   }
 }

 bool passwordconfirmed() {
   if (passwodconttroler.text.trim() == conformpasswodconttroler.text.trim()) {
     return true;
   } else {
     return false;
   }
 }

 void openSignScreen() {
   Navigator.of(context).pushReplacement(
       MaterialPageRoute(builder: (context) => const SignUpPage()));
 }

 @override
 void dispose() {
   super.dispose();
   emailcontroller.dispose();
   passwodconttroler.dispose();
   conformpasswodconttroler.dispose();
 }

 @override
 Widget build(BuildContext context) {
   return Scaffold(
       backgroundColor: Colors.white70,
       body: SafeArea(
         child: ListView(children: [
           Stack(
             children: [
               Form(
                 key: formstate,
                 child: Column(
                   mainAxisAlignment: MainAxisAlignment.start,
                   children: [
                     const SizedBox(
                       height: 150,
                       width: 60,
                     ),
                     const Text("Create Account",
                         style: TextStyle(
                             fontSize: 40,
                             fontWeight: FontWeight.w800,
                             fontFamily: 'Montserrat')),
                     const SizedBox(
                       height: 60,
                       width: 20,
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 20) {
                             return "Password is very long";
                           }
                           if (value.length < 7) {
                             return "Password is very short";
                           } else {
                             return null;
                           }
                         },
                         controller: namecontroller,
                         keyboardType: TextInputType.visiblePassword,
                         textAlignVertical: TextAlignVertical.bottom,
                         decoration: InputDecoration(
                           hintText: "Full Name",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 50) {
                             return "Password is very long";
                           }
                           if (value.length < 8) {
                             return "Password is very short";
                           } else {
                             return null;
                           }
                         },
                         controller: emailcontroller,
                         keyboardType: TextInputType.emailAddress,
                         textAlignVertical: TextAlignVertical.bottom,
                         decoration: InputDecoration(
                           hintText: "Email",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 20) {
                             return "Password is very long";
                           }
                           if (value.length < 7) {
                             return "Password is very short";
                           } else {
                             return null;
                           }
                         },
                         controller: passwodconttroler,
                         keyboardType: TextInputType.visiblePassword,
                         textAlignVertical: TextAlignVertical.bottom,
                         obscureText: true,
                         decoration: InputDecoration(
                           hintText: "Password",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 40),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 20) {
                             return "Password is very long";
                           }
                           if (value.length < 7) {
                             return "Password is very short";
                           } else {
                             return null;
                           }
                         },
                         controller: conformpasswodconttroler,
                         textAlignVertical: TextAlignVertical.bottom,
                         obscureText: true,
                         keyboardType: TextInputType.visiblePassword,
                         decoration: InputDecoration(
                           hintText: "Conform Password",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     ElevatedButton(
                       onPressed: () {
                         if (signUp() == null) {
                           Navigator.of(context).pushReplacement(
                               MaterialPageRoute(
                                   builder: (context) => const Screens()));
                         }
                       },
                       style: ElevatedButton.styleFrom(
                         alignment: Alignment.center,
                         shape: RoundedRectangleBorder(
                           borderRadius: BorderRadius.circular(30),
                         ),
                         backgroundColor: Colors.white,
                         maximumSize: const Size(300, 65),
                         minimumSize: const Size(300, 65),
                       ),
                       child: const DummyText(
                         text: "Sign Up",
                         size: 9,
                       ),
                     ),
                     const SizedBox(
                       height: 60,
                     )
                   ],
                 ),
               ),
             ],
           ),
         ]),
       ));
 }
}

用户问题

我已将Firebase Realtime Database规则设置为true，并且重新下载了google-services.json文件，但数据库仍然没有任何数据写入，也无响应。

请协助我解决这个问题

问题分析与修复方案

你的代码存在几个核心逻辑错误，直接导致数据库写入失败：

1. 数据库写入逻辑位置错误+递归调用

在signUp()方法中，账号创建成功后会直接return credential，根本不会执行到函数末尾的数据库写入代码；同时你错误地递归调用signUp()来判断结果，会引发无限循环，完全偏离预期逻辑。

2. 异步方法处理错误

signUp()是异步方法，你在按钮点击事件中直接用if (signUp() == null)判断，这完全错误——异步方法返回的是Future对象，永远不会等于null，所以页面跳转逻辑永远不会触发。

修复后的完整代码

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/material.dart';

import '../app settings/text sittings.dart';
import '../screens.dart';

// ignore: must_be_immutable
class SignUpPage extends StatefulWidget {
 const SignUpPage({Key? key}) : super(key: key);

 @override
 State<SignUpPage> createState() => _SignUpPageState();
}

class _SignUpPageState extends State<SignUpPage> {
 final namecontroller = TextEditingController();
 final emailcontroller = TextEditingController();
 final passwodconttroler = TextEditingController();
 final conformpasswodconttroler = TextEditingController();

 GlobalKey<FormState> formstate = GlobalKey<FormState>();
 final database = FirebaseDatabase.instance;

 Future<User?> signUp() async {
   var formdata = formstate.currentState;
   if (formdata!.validate()) {
     formdata.save();
     if (passwordconfirmed()) {
       try {
         final UserCredential credential =
             await FirebaseAuth.instance.createUserWithEmailAndPassword(
           email: emailcontroller.text,
           password: passwodconttroler.text,
         );
         // 账号创建成功后立即写入数据库
         if (credential.user != null) {
           DatabaseReference ref = FirebaseDatabase.instance.ref("users");
           await ref.child(credential.user!.uid).set({
             "id": credential.user!.uid,
             "name": namecontroller.text,
             "email": emailcontroller.text,
           });
         }
         return credential.user;
       } on FirebaseAuthException catch (e) {
         if (e.code == 'weak-password') {
           AwesomeDialog(
               context: context,
               dialogType: DialogType.warning,
               animType: AnimType.bottomSlide,
               title: '密码强度不足',
               body: const Text("密码过于简单")).show();
         } else if (e.code == 'email-already-in-use') {
           AwesomeDialog(
               context: context,
               dialogType: DialogType.warning,
               animType: AnimType.bottomSlide,
               title: '账号已存在',
               body: const Text("该邮箱已注册过账号")).show();
         }
         return null;
       } catch (e) {
         print(e);
         return null;
       }
     }
   }
   return null;
 }

 bool passwordconfirmed() {
   return passwodconttroler.text.trim() == conformpasswodconttroler.text.trim();
 }

 void openSignScreen() {
   Navigator.of(context).pushReplacement(
       MaterialPageRoute(builder: (context) => const SignUpPage()));
 }

 @override
 void dispose() {
   super.dispose();
   emailcontroller.dispose();
   passwodconttroler.dispose();
   conformpasswodconttroler.dispose();
 }

 @override
 Widget build(BuildContext context) {
   return Scaffold(
       backgroundColor: Colors.white70,
       body: SafeArea(
         child: ListView(children: [
           Stack(
             children: [
               Form(
                 key: formstate,
                 child: Column(
                   mainAxisAlignment: MainAxisAlignment.start,
                   children: [
                     const SizedBox(height: 150, width: 60),
                     const Text("Create Account",
                         style: TextStyle(
                             fontSize: 40,
                             fontWeight: FontWeight.w800,
                             fontFamily: 'Montserrat')),
                     const SizedBox(height: 60, width: 20),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 20) return "名字过长";
                           if (value.length < 2) return "名字过短";
                           return null;
                         },
                         controller: namecontroller,
                         keyboardType: TextInputType.text,
                         textAlignVertical: TextAlignVertical.bottom,
                         decoration: InputDecoration(
                           hintText: "Full Name",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.isEmpty || !value.contains("@")) {
                             return "请输入有效的邮箱";
                           }
                           return null;
                         },
                         controller: emailcontroller,
                         keyboardType: TextInputType.emailAddress,
                         textAlignVertical: TextAlignVertical.bottom,
                         decoration: InputDecoration(
                           hintText: "Email",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 20),
                       child: TextFormField(
                         validator: (value) {
                           if (value!.length > 20) return "密码过长";
                           if (value.length < 7) return "密码过短";
                           return null;
                         },
                         controller: passwodconttroler,
                         keyboardType: TextInputType.visiblePassword,
                         textAlignVertical: TextAlignVertical.bottom,
                         obscureText: true,
                         decoration: InputDecoration(
                           hintText: "Password",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     Padding(
                       padding: const EdgeInsets.only(
                           left: 30, right: 30, bottom: 40),
                       child: TextFormField(
                         validator: (value) {
                           if (value != passwodconttroler.text) {
                             return "两次输入的密码不一致";
                           }
                           return null;
                         },
                         controller: conformpasswodconttroler,
                         textAlignVertical: TextAlignVertical.bottom,
                         obscureText: true,
                         keyboardType: TextInputType.visiblePassword,
                         decoration: InputDecoration(
                           hintText: "Conform Password",
                           filled: true,
                           fillColor: Colors.white12,
                           border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(45),
                               borderSide: BorderSide.none),
                         ),
                       ),
                     ),
                     ElevatedButton(
                       onPressed: () async {
                         User? user = await signUp();
                         if (user != null) {
                           Navigator.of(context).pushReplacement(
                               MaterialPageRoute(
                                   builder: (context) => const Screens()));
                         }
                       },
                       style: ElevatedButton.styleFrom(
                         alignment: Alignment.center,
                         shape: RoundedRectangleBorder(
                           borderRadius: BorderRadius.circular(30),
                         ),
                         backgroundColor: Colors.white,
                         maximumSize: const Size(300, 65),
                         minimumSize: const Size(300, 65),
                       ),
                       child: const DummyText(
                         text: "Sign Up",
                         size: 9,
                       ),
                     ),
                     const SizedBox(height: 60)
                   ],
                 ),
               ),
             ],
           ),
         ]),
       ));
 }
}

额外优化说明

  • 修正了表单验证的错误提示（比如名字输入框不再显示密码相关提示）
  • 邮箱验证改为检查格式合法性
  • 确认密码的验证逻辑更精准，直接对比密码输入框内容
  • 数据库节点改为users，用用户UID作为节点Key，符合Firebase最佳实践

内容的提问来源于stack exchange，提问作者ISLAM IS LIFE

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最近更新时间：2026.07.26 02:47:18