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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

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

其他回答

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

对我来说，问题是我初始化它没有“等待”:

void main() async {
    WidgetsFlutterBinding.ensureInitialized();
    Firebase.initializeApp();

正确的做法是:

void main() async {
    WidgetsFlutterBinding.ensureInitialized();
    await Firebase.initializeApp();
2021-03-25 00:35:55

初始化firebase选项

void main() async{
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform).catchError((e){
  print(" Error : ${e.toString()}");
});
}

像这样

2022-02-28 12:15:24

颤动网与Firebase

如果您正在使用Flutter Web和Firebase，请确保在您的。/ Web /index.html的正文标签中安装了sdk

  <script src="https://www.gstatic.com/firebasejs/8.2.9/firebase-app.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.2.9/firebase-analytics.js"></script>

此外，确保使用index.html中的配置参数调用firebase.initializeApp(…)。

  <script>
    // Your web app's Firebase configuration
    // For Firebase JS SDK v7.20.0 and later, measurementId is optional
    var firebaseConfig = {
      apiKey: "AIz...",
      authDomain: "...",
      databaseURL: "https://<project-name>.firebaseio.com",
      projectId: "...",
      storageBucket: "<project-name>.appspot.com",
      messagingSenderId: "...",
      appId: "...",
      measurementId: "..."
    };
    firebase.initializeApp(firebaseConfig);
    firebase.analytics();
  </script>

最后，按照Peter Haddad的回答配置firebase:

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}
2021-02-21 06:31:20

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

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