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FirebaseError: Firebase: 否 Firebase App '[DEFAULT]' 已創建 - 調用 Firebase App.initializeApp() {顫動網絡}

[英]FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app). {Flutter web}

 原文  2021-10-31 10:13:37  9   2    firebase/ flutter/ dart/ web

問題描述

問題**

FirebaseError：Firebase：沒有 Firebase 應用程序“[DEFAULT]”已創建

  • 調用 Firebase App.initializeApp() (app/no-app)。

**

在超過 7 天的時間里，我自己試圖解決我的“flutter admin web app”問題。 但我不能。

√ My firebase auth is: Anonymous √ Flutter (Channel beta, 2.7.0-3.1.pre √ Dart version 2.15 √ Android toolchain - develop for Android devices (Android SDK version 31.0.0) √ Chrome - develop for the web √ Android Studio （版本 2020.3）

我該如何解決這個問題？

請幫我。 誰知道呢，親愛的導師。

index.html（文件）

  <!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
  -->
  <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="grocery_admin_app_flutter">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <title>grocery_admin_app_flutter</title>
  <link rel="manifest" href="manifest.json">
</head>
<body>
<!-- This script installs service_worker.js to provide PWA functionality to
     application. For more information, see:
     https://developers.google.com/web/fundamentals/primers/service-workers -->
<!-- The core Firebase JS SDK is always required and must be listed first -->
<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-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-firestore.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-storage.js"></script>

<script type="text/javascript">
    let useHtml = // ...
    if(useHtml) {
      window.flutterWebRenderer = "html";
    } else {
      window.flutterWebRenderer = "canvaskit";
    }
  </script>

<script src="main.dart.js" type="application/javascript"></script>


<script>
  // Your web app's Firebase configuration
  // For Firebase JS SDK v7.20.0 and later, measurementId is optional
  const firebaseConfig = {
    apiKey: "AIzaSyAgoXpOjiZntQBEMqt7ZDrcFpLRmH1ZwCM",
    authDomain: "jaituncshop.firebaseapp.com",
    databaseURL: "https://jaituncshop-default-rtdb.firebaseio.com",
    projectId: "jaituncshop",
    storageBucket: "jaituncshop.appspot.com",
    messagingSenderId: "338592147861",
    appId: "1:338592147861:web:14315ce1d827ad50c1ee9c",
    measurementId: "G-TG69GZ1VSX"
  };

  // Initialize Firebase
  const app = initializeApp(firebaseConfig);
  const analytics = getAnalytics(app);
</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 () {
        // 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>

2 個解決方案

解決方案1
 1 已采納  2021-10-31 10:42:54

我昨天遇到了完全相同的問題，大多數解決方案都沒有解決問題。 我終於解決了它並將發布我的整個 index.html 以便您可以使用它。 如果可能，逐字使用它，當它起作用時，您就可以開始編輯了。

<!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.

    Fore more details:
    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
  -->
  <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="fiber">
  <link rel="apple-touch-icon" href="icons/Icon-192.png">

  <!-- Favicon -->
  <link rel="icon" type="image/png" href="favicon.png" />

  <title>Your title</title>
  <link rel="manifest" href="manifest.json">
</head>

<body>
  <!-- This script installs service_worker.js to provide PWA functionality to
       application. For more information, see:
       https://developers.google.com/web/fundamentals/primers/service-workers -->
  <script>
    if ('serviceWorker' in navigator) {
      window.addEventListener('flutter-first-frame', function () {
        navigator.serviceWorker.register('flutter_service_worker.js');
      });
    }
  </script>

  <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-firestore.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-auth.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-functions.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-messaging.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-storage.js"></script>
  <script>
    const firebaseConfig = {
      apiKey: "...",
      authDomain: "...",
      databaseURL: "...,
      projectId: "...",
      storageBucket: "...",
      messagingSenderId: "...",
      appId: "...",
      measurementId: "..."
    };

    firebase.initializeApp(firebaseConfig);
  </script>

  <script src="main.dart.js" type="application/javascript"></script>
</body>

</html>

但只要看看你的代碼，我就可以告訴你這一行<script src="main.dart.js" type="application/javascript"></script>必須<script src="main.dart.js" type="application/javascript"></script>最后，因為它使用了“app”

解決方案2
 0  2022-08-23 19:06:58

我遇到了這個問題，最后看來我的問題是我在initializeApp中使用了一個name ：

await Firebase.initializeApp(
  options: DefaultFirebaseOptions.currentPlatform,
  name: 'I HAD A NAME HERE',
);

在 android 上，這可以工作，后來調用.instance成功等等。但是，在 web 上，它無法正確設置為默認應用程序。

為了解決這個問題，我只是刪除了名字......並提交了一個錯誤，所以希望這個問題得到修復。

A note regarding many of the other solutions here: according to the research I've done, in the latest versions of firebase for flutter web it should not be required to put any code in index.html as of https://github.com /firebase/flutterfire/pull/7358 ，見https://github.com/firebase/flutterfire/issues/8572

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