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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

只使用飞镖初始化(推荐)

在所有平台上使用CLI初始化Firebase。 不需要添加任何本地代码。 无需下载任何谷歌服务文件。

Install FlutterFire CLI dart pub global activate flutterfire_cli (Optional) Add the following line to your ~/.zshrc file and save it export PATH="$PATH":"$HOME/.pub-cache/bin" Run the configure: flutterfire configure Press enter to configure all the platforms You should now have a lib/firebase_options.dart file. Import this file in your main.dart and use Firebase.initializeApp. import 'firebase_options.dart'; void main() async { WidgetsFlutterBinding.ensureInitialized(); // This is the last thing you need to add. await Firebase.initializeApp( options: DefaultFirebaseOptions.currentPlatform, ); runApp(...); }

迁移到仅dart初始化:

如果您已经有一个现有的应用程序，您可以通过以下方式迁移它。

Android: 删除谷歌服务。Json文件从<flutter-project>/android/app: 删除<flutter-project>/android/build中的以下行。gradle文件 删除<flutter-project>/android/app/build中的以下行。gradle文件 iOS 打开< flutter-project > / ios /跑步者。在Xcode中删除GoogleService-Info文件。来自Runner的plist文件。 macOS 打开< flutter-project > / macos /跑步者。在Xcode中删除GoogleService-Info文件。来自Runner的plist文件。

更多信息可以在这里找到

2021-12-23 20:30:11

其他回答

你需要添加await Firebase.initializeApp();这就是未来。在运行Firebase函数的dart文件中执行，如下所示:

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

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MaterialApp());
}
2020-09-29 07:13:43

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

彼得的答案是完美的!但如果您的代码中仍然出现错误，并遵循Flutter Firebase代码实验室，请注意，这些教程截至2020年8月已过时，尚未更新。

你需要做很多其他的改变，比如:

将.data替换为.data() 用update替换updateData

2020-09-04 19:35:35

自2017年8月以来，所有Firebase服务都已更新，因此在使用任何Firebase产品之前，您必须在主程序中调用Firebase. initializeapp()，例如:

如果您希望在flutter应用程序中使用firebase_core插件，则在您的pubspec中。Yaml文件添加firebase_core如下所示

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^1.19.1

然后调用Firebase.initializeApp():在你的应用中。如下所示:

import 'package:firebase_core/firebase_core.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}
2021-06-02 08:12:11

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