Flutter, FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - 调用 Firebase App.ini
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【中文标题】Flutter, FirebaseError: Firebase: No Firebase App \'[DEFAULT]\' has been created - 调用 Firebase App.initializeApp() (app/no-app)【英文标题】：Flutter, FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app)Flutter, FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - 调用 Firebase App.initializeApp() (app/no-app) 【发布时间】：2021-09-09 03:41:15 【问题描述】：我正在尝试在 Web 上运行我的移动 Flutter 应用程序，我想我完成了我需要做的所有配置，但我收到错误：“FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - 调用 Firebase App.initializeApp() (app/no-app)。”有谁知道我该怎么做才能解决它？我正在 main 中初始化 firebase，我找不到我还能做什么。
这是我的 main.dart：
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:untitled1/quiz_app/sign_in.dart';
void main() async
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MaterialApp(
//initialRoute: '/SignIn',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.indigo
),
routes:
'/SignIn' :(context) => SignInPage(),
,
home: Scaffold(
resizeToAvoidBottomInset: false,
body: SignInPage()
),
));
这里是 index.html：
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="$FLUTTER_BASE_HREF">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- ios meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="ahmett">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<title>ahmett</title>
<link rel="manifest" href="manifest.json">
</head>
<body>
<!-- The core Firebase JS SDK is always required and must be listed first -->
<script src="https://www.gstatic.com/firebasejs/8.6.8/firebase-app.js"></script>
<!-- TODO: Add SDKs for Firebase products that you want to use
https://firebase.google.com/docs/web/setup#available-libraries -->
<script src="https://www.gstatic.com/firebasejs/8.6.8/firebase-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.8/firebase-storage.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.8/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.8/firebase-firestore.js"></script
<script>
// Your web app's Firebase configuration
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
var firebaseConfig =
apiKey: "cencored",
authDomain: "cencored",
projectId: "cencored",
storageBucket: "cencored",
messagingSenderId: "cencored",
appId: "cencored",
measurementId: "cencored"
;
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
firebase.analytics();
</script>
</script><script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
【问题讨论】：
***.com/questions/65353335/… 您可以使用此表单，但将 MyApp() 放在 runApp() 中，然后将您的应用程序编写为函数小部件 MyApp 我将 main.dart 更改为那个，但仍然出现同样的错误 问题与我的 index.html 文件有关，但我也在 main.dart 中使用了您的格式，所以谢谢！ 没问题，很高兴看到您解决了问题。快乐编码 Ahmet Hakan kardesim 【参考方案1】：对于 Flutter Web，Firebase 插件有一个新设置。 首先，按照这里提到的所有步骤https://firebase.flutter.dev/docs/installation/web
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>example</title>
</head>
<body>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-messaging.js"></script>
<script>
// Your web app's Firebase configuration
var firebaseConfig =
apiKey: "...",
authDomain: "[YOUR_PROJECT].firebaseapp.com",
databaseURL: "https://[YOUR_PROJECT].firebaseio.com",
projectId: "[YOUR_PROJECT]",
storageBucket: "[YOUR_PROJECT].appspot.com",
messagingSenderId: "...",
appId: "1:...:web:...",
measurementId: "G-...",
;
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
</script>
<script src="main.dart.js" type="application/javascript"></script>
<script>
var serviceWorkerVersion = null;
var scriptLoaded = false;
function loadMainDartJs()
if (scriptLoaded)
return;
scriptLoaded = true;
var scriptTag = document.createElement('script');
scriptTag.src = 'main.dart.js';
scriptTag.type = 'application/javascript';
document.body.append(scriptTag);
if ('serviceWorker' in navigator)
// Service workers are supported. Use them.
window.addEventListener('load', function ()
//register firebase-messaging service worker
navigator.serviceWorker.register("/firebase-messaging-sw.js");
// Wait for registration to finish before dropping the <script> tag.
// Otherwise, the browser will load the script multiple times,
// potentially different versions.
var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
navigator.serviceWorker.register(serviceWorkerUrl)
.then((reg) =>
function waitForActivation(serviceWorker)
serviceWorker.addEventListener('statechange', () =>
if (serviceWorker.state == 'activated')
console.log('Installed new service worker.');
loadMainDartJs();
);
if (!reg.active && (reg.installing || reg.waiting))
// No active web worker and we have installed or are installing
// one for the first time. Simply wait for it to activate.
waitForActivation(reg.installing ?? reg.waiting);
else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion))
// When the app updates the serviceWorkerVersion changes, so we
// need to ask the service worker to update.
console.log('New service worker available.');
reg.update();
waitForActivation(reg.installing);
else
// Existing service worker is still good.
console.log('Loading app from service worker.');
loadMainDartJs();
);
// If service worker doesn't succeed in a reasonable amount of time,
// fallback to plaint <script> tag.
setTimeout(() =>
if (!scriptLoaded)
console.warn(
'Failed to load app from service worker. Falling back to plain <script> tag.',
);
loadMainDartJs();
, 4000);
);
else
// Service workers not supported. Just drop the <script> tag.
loadMainDartJs();
</script>
</body>
</html>
在以下位置查看此设置 https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_messaging/firebase_messaging/example/web
【讨论】：
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