我在颤振（飞镖）中遇到一些错误

Posted 2023-02-23

【中文标题】我在颤振（飞镖）中遇到一些错误

【英文标题】：I am getting some errors in flutter(dart)

【发布时间】：2021-12-07 17:41:30

【问题描述】：

我正在 YouTube 上观看有关 Flutter 的教程。我来到了 Firebase 部分。但是，我在这部分遇到了错误。即使我输入相同的内容，我也会收到错误消息。我想我遇到了这样的错误，因为 Flutter 语言有更新。很抱歉我的英语不好。提前感谢您对我的帮助。

错误图片：

main.dart

import 'package:firebasedenemem/singup_screen.dart';
import 'package:flutter/material.dart';

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


class MyApp extends StatelessWidget 
  const MyApp(Key? key) : super(key: key);

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

signup_screen.dart

import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'dart:io';

class SignupScreen extends StatefulWidget 
  const SignupScreen(Key? key) : super(key: key);

  @override
  _SignupScreenState createState() => _SignupScreenState();


class _SignupScreenState extends State<SignupScreen> 
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  final picUrl = "";
  File? _image;

  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _lastnameController = TextEditingController();
  final TextEditingController _emailController = TextEditingController();

  FirebaseAuth auth = FirebaseAuth.instance;

  @override
  Widget build(BuildContext context) 
    return Container(
      padding: EdgeInsets.only(top: 30),
      color: Colors.grey[800],
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          const Image(
            image: AssetImage("assets/images/logo.png"),
            width: 200,
            height: 100,
          ),
          Container(
            margin: const EdgeInsets.only(top: 10),
            decoration: BoxDecoration(
                border: Border.all(color: Colors.white, width: 11),
                color: Colors.white,
                borderRadius: const BorderRadius.only(
                  topRight: Radius.circular(122),
                  bottomLeft: Radius.circular(122),
                )),
          ),
        ],
      ),
    );
  

【问题讨论】：

嗯“了解如何在...处解决此问题”您是否错过了这部分错误？

【参考方案1】：

打开/android/app/build.gradle 文件。在dependencies 下添加multidex 模块，并在defaultConfig 中启用它：

android 
    defaultConfig 
        // ...
        minSdkVersion 16
        targetSdkVersion 28
        multiDexEnabled true
    


dependencies 
  implementation 'com.android.support:multidex:1.0.3'

此链接中的更多详细信息： https://firebase.flutter.dev/docs/installation/android

另请参阅此答案，它适用于您的情况： Flutter Firestore causing D8: Cannot fit requested classes in a single dex file (# methods: 71610 > 65536) in Android Studio

【讨论】：

我通过在 void WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(); 中编写这段代码来修复它