调用Firebase.initializeApp（），但我已经在我的代码[复制]

Question

所以我试图用Firebase制作一个flutter应用程序，它工作得非常好，但是当我运行该应用程序时，我得到了这个错误：

════════ Exception caught by widgets library ═══════════════════════════════════
The following FirebaseException was thrown building _BodyBuilder:
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

    The relevant error-causing widget was
    Scaffold
    package:app_with_firebase/main.dart:14
    When the exception was thrown, this was the stack
    #0      MethodChannelFirebase.app
    package:firebase_core_platform_interface/…/method_channel/method_channel_firebase.dart:122
    #1      Firebase.app
    package:firebase_core/src/firebase.dart:54
    #2      FirebaseAuth.instance
    package:firebase_auth/src/firebase_auth.dart:37
    #3      new AuthService
    package:app_with_firebase/Services/auth.dart:4
    #4      new _LoginPageState
    package:app_with_firebase/main.dart:29
    ...
    ════════════════════════════════════════════════════════════════════════════════

但问题是，我的代码中有一行：

//import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'Services/auth.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  Firebase.initializeApp();
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: LoginPage(),
      ),
    ),
  );
}

我怎样才能摆脱这个？该应用程序运行良好，但它非常分散注意力，感谢任何帮助，谢谢。

Answer 1

在Firebase前面添加wait关键字。初始化EAPP（）
因为这是一个耗时的函数，所以您应该在该语句中等待一段时间。如果您错过了wait关键字，它应该返回null值。

void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(
  MaterialApp(
    debugShowCheckedModeBanner: false,
    home: Scaffold(
      body: LoginPage(),
    ),
  ),
);
}