在颤振web项目中创建默认应用程序错误时，FirebaseOptions不能为空
在颤振web项目中创建默认应用程序错误时，FirebaseOptions不能为空
提问于 2021-12-05 15:45:15
我正在尝试创建简单的网页应用程序使用颤振和火基。我以正确的方式更新依赖项和index.html文件。当我试图执行我的代码时，我得到了这个错误。我试过很多项目，但还是搞不清楚。
以下是我的索引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="sportal_web_panel">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<title>sportal_web_panel</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>
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>
<script src="https://www.gstatic.com/firebasejs/9.6.0/firebase-app.js"></script>
<script>
var firebaseConfig = {
apiKey: "xxxxxxx",
authDomain: "xxxxxx",
projectId: "xxxxxxx",
storageBucket: "xxxxxxxx",
messagingSenderId: "xxxxxxxxxxx",
appId: "x"
};
firebase.initializeApp(firebaseConfig);
</script>
</body>
</html>
下面是我的基本颤振代码：
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
runApp(App());
}
class App extends StatefulWidget {
@override
_AppState createState() => _AppState();
}
class _AppState extends State<App> {
final Future<FirebaseApp> _initialization = Firebase.initializeApp();
@override
Widget build(BuildContext context) {
return FutureBuilder(
// Initialize FlutterFire:
future: _initialization,
builder: (context, snapshot) {
// Check for errors
if (snapshot.hasError) {
return Text(snapshot.error.toString(),
textDirection: TextDirection.ltr);
}
if (snapshot.connectionState == ConnectionState.done) {
return MyApp();
}
return CircularProgressIndicator();
},
);
}
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
),
);
}
}回答 2
Stack Overflow用户
回答已采纳
发布于 2021-12-05 17:40:25
我通过指定参数initializeApp解决了这个问题。
final Future<FirebaseApp> _initialization = Firebase.initializeApp(
options: FirebaseOptions(
apiKey: "xxxx",
authDomain: "xxxx",
projectId: "xxxx",
storageBucket: "xxx",
messagingSenderId: "xxxxx",
appId: "xxxx"),
);Stack Overflow用户
发布于 2022-10-03 19:47:52
要找到上面的答案中提到的这些选项，请转到Firebase控制台，单击Add App > Web --创建后，转到> Settings >区段>选择Web，然后选择Config Radio选项。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70235905
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