Flutter WEB：Firebase：没有创建 Firebase 应用“[DEFAULT]”
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【中文标题】Flutter WEB：Firebase：没有创建 Firebase 应用“[DEFAULT]”【英文标题】：Flutter WEB: Firebase: No Firebase App '[DEFAULT]' has been created 【发布时间】：2021-03-28 21:20:16 【问题描述】：在我的 Flutter WEB 项目中将这些依赖项添加到我的 pubspec.yaml 之后
firebase_auth: ^0.18.4+1
cloud_firestore: ^0.14.4
firebase_core: ^0.5.3
这些在我的 web/index.html 文件中
<script src="https://www.gstatic.com/firebasejs/8.2.1/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.1/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.1/firebase-firestore.js"></script>
<script>
// Your web app's Firebase configuration
var firebaseConfig =
apiKey: "xxxxxxxxxxxxxxxxxxxxxxxx",
authDomain: "xxxxxxxxxxxxxxxxxxx",
projectId: "xxxxxxxxxxxxxxxxxxxx",
storageBucket: "xxxxxxxxxxxxxxxxx",
messagingSenderId: "xxxxxxxxxxxxxxxx",
appId: "xxxxxxxxxxxxxxxxxxx"
;
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
</script>
当我尝试重建 WEB 应用时，我得到：
Firebase：没有创建 Firebase 应用“[DEFAULT]” - 调用 Firebase App.initializeApp() (app/no-app)。
与此相关的任何错误？ 附加错误：
FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app).
at Object.f [as app] (https://www.gstatic.com/firebasejs/8.2.1/firebase-app.js:1:16867)
at Object.app$ [as app] (http://localhost:40783/packages/firebase_core_web/src/interop/core.dart.lib.js:32:101)
at initializeApp (http://localhost:40783/packages/firebase_core_web/firebase_core_web.dart.lib.js:81:25)
at initializeApp.next (<anonymous>)
at runBody (http://localhost:40783/dart_sdk.js:37976:34)
at Object._async [as async] (http://localhost:40783/dart_sdk.js:38007:7)
at firebase_core_web.FirebaseCoreWeb.new.initializeApp (http://localhost:40783/packages/firebase_core_web/firebase_core_web.dart.lib.js:74:20)
at initializeApp (http://localhost:40783/packages/firebase_core/firebase_core.dart.lib.js:122:59)
at initializeApp.next (<anonymous>)
at runBody (http://localhost:40783/dart_sdk.js:37976:34)
at Object._async [as async] (http://localhost:40783/dart_sdk.js:38007:7)
at Function.initializeApp (http://localhost:40783/packages/firebase_core/firebase_core.dart.lib.js:121:20)
at main$ (http://localhost:40783/packages/vibeland/widgets/subscription_widget.dart.lib.js:9807:36)
at main$.next (<anonymous>)
at runBody (http://localhost:40783/dart_sdk.js:37976:34)
at Object._async [as async] (http://localhost:40783/dart_sdk.js:38007:7)
at main$ (http://localhost:40783/packages/vibeland/widgets/subscription_widget.dart.lib.js:9805:18)
at main (http://localhost:40783/web_entrypoint.dart.lib.js:34:27)
at main.next (<anonymous>)
at http://localhost:40783/dart_sdk.js:37956:33
at _RootZone.runUnary (http://localhost:40783/dart_sdk.js:37810:58)
at _FutureListener.thenAwait.handleValue (http://localhost:40783/dart_sdk.js:32771:29)
at handleValueCallback (http://localhost:40783/dart_sdk.js:33319:49)
at Function._propagateToListeners (http://localhost:40783/dart_sdk.js:33357:17)
at async._AsyncCallbackEntry.new.callback (http://localhost:40783/dart_sdk.js:33082:27)
at Object._microtaskLoop (http://localhost:40783/dart_sdk.js:38071:13)
at _startMicrotaskLoop (http://localhost:40783/dart_sdk.js:38077:13)
at http://localhost:40783/dart_sdk.js:33574:9
【问题讨论】：
这能回答你的问题吗：***.com/a/63492262/12789200 【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
下面的文件是web/index.html
<!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】：
【参考方案2】：在main()方法中初始化
void main() async
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
【讨论】：
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