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2023-10-08 07:00:00

未创建Firebase应用程序“[DEFAULT]”—在Flutter和Firebase中调用Firebase. initializeapp ()

我正在构建一个Flutter应用程序，我已经集成了Firebase，但当我点击一个按钮注册，登录或注销时，我一直得到这个错误。我看到其他人也问过同样的问题，但似乎没有一个对我有用。我正在使用Flutter和Android Studio。我该如何解决这个问题?

这是我的代码的摘录

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.red,
      body: Center(
        child: Container(
          child: RaisedButton(
            onPressed: () {
              FirebaseAuth.instance.signOut().then((value) {
                Navigator.pushReplacement(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            LoginScreen()));
              });
            },
            child: Text("Logout"),
          )
        )
      )
    );
  }
}

下面是抛出的异常

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following FirebaseException was thrown while handling a gesture:
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

When the exception was thrown, this was the stack:

#0      MethodChannelFirebase.app (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:118:5)
#1      Firebase.app (package:firebase_core/src/firebase.dart:52:41)
#2      FirebaseAuth.instance (package:firebase_auth/src/firebase_auth.dart:37:47)
#3      _HomeScreenState.build.<anonymous closure> (package:cosytok/screens/home.dart:20:28)
#4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
#5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
#6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
#7      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
#8      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
#9      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:219:7)
#10     PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:477:9)
#11     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:78:12)
#12     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:124:9)
#13     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
#14     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:122:18)
#15     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:108:7)
#16     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:220:19)
#17     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
#18     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
#19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
#20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
#24     _invoke1 (dart:ui/hooks.dart:267:10)
#25     _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)
(elided 3 frames from dart:async)

Handler: "onTap"
Recognizer:
  TapGestureRecognizer#f0104
════════════════════════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by gesture ═══════════════════════════════════════════════════════════════
The following FirebaseException was thrown while handling a gesture:
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

当前回答

就我而言，我为现有项目添加了web支持。 唯一能解决这个问题的是，

在web/index.html文件中

将所有firebase sdk导入版本从9.6.6更改为8.10.0

片段

<script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app-check.js"></script>  
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-firestore.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-auth.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-storage.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-messaging.js"></script>
 <script>
  var firebaseConfig = {
   ....
   }
2022-02-13 10:45:41

其他回答

你需要在main函数中添加await FirebaseApp.initializeApp()，记住要在main函数中添加await

2021-10-24 05:36:35

就我而言，我为现有项目添加了web支持。 唯一能解决这个问题的是，

在web/index.html文件中

将所有firebase sdk导入版本从9.6.6更改为8.10.0

片段

<script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app-check.js"></script>  
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-firestore.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-auth.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-storage.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-messaging.js"></script>
 <script>
  var firebaseConfig = {
   ....
   }
2022-02-13 10:45:41

确保您使用的是正确的/官方版本的firebase包。

我用的是:

firebase_core_dart: <version-number>

在:https://pub.dev/packages/firebase_core_dart

而不是官方

firebase_core: <版本号>

在https://pub.dev/packages/firebase_core

使用第一个选项，我得到了初始化时使用:

await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  ).whenComplete(
      () => print('FIREBASE INITIALIZED================>'));

但是验证失败，并出现OP描述的错误消息。

2022-11-07 07:22:57

从Flutter 2.8版本开始，现在可以在使用Firebase的所有平台上从Dart初始化FlutterFire。initializeApp函数。有一种更简单快捷的方法来初始化一个firebase项目，而不是从firebase控制台下载.json和.plist文件并将它们放入您的Flutter项目文件夹中，这可能会导致一些警告。这是我经历过几次的问题，下面是我解决它的方法。

在firebase控制台步骤中创建项目并在这里安装firebase CLI后，请继续执行以下步骤:

如果已经使用flutterfire配置配置了firebase项目，则可以跳过步骤1并跳转到步骤4。

从您的项目根终端，命令: $ flutterfire配置 //需要Firebase命令行才能正常工作。 按回车键或回车键选择firebase项目。 插入bundle ID。你可以通过右键单击ios文件夹>，然后单击“在xcode中打开”来获得。Bundle Identifier将出现在右边的白色面板中，当提示时，你必须在终端中手动输入。

**如果您已经安装了firebase_core插件，请继续执行步骤5。**

Install the latest version of the firebase_core plugin by running this command from your project root directory: $ flutter pub add firebase_core // Adds to pubspec.yaml Add imports to the main file: import 'package:firebase_core/firebase_core.dart'; // import 'firebase_options.dart'; // Generated file Update your main function to initialize firebase with this async function: Future<void> main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform); runApp(const YourAppName()); }

有关更多信息，请参阅FlutterFire文档。

2022-03-18 14:43:45

这是2022年初始化firebase的方法

首先，使用此链接==>安装FlutterFire 颤振消防安装环节

安装FlutterFire之后，需要在lib/main中添加这些代码行。飞镖文件

  import 'package:firebase_core/firebase_core.dart';
  import 'firebase_options.dart';

然后编辑你的主函数如下所示

void main() async {
 WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp(options:                                  
   DefaultFirebaseOptions.currentPlatform,);
 runApp(MyApp()); 
 }

这在将来可能会改变，因此请参考下面的最新实现参考

初始化FlutterFire #

2022-02-22 10:46:14

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