[英]No Firebase App '[Default]' error but firebase is already initialized
[英]'no default app' exception after Firebase has been initialized
我正在使用特定项目初始化 Firebase。 然后我将生成的 FirebaseApp 传递给 FirebaseFirestore.instanceOf 方法。 我正在使用硬编码的配置值,因为最终这个实现将使用多个项目。
当我尝试写入集合时,出现以下异常...
FirebaseException ([core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp())
这是一个最小的可重现示例,带有注释,指示引发异常的行...
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
void initState() {
super.initState();
_asyncInit();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Test App"),
),
body: Container(),
);
}
Future<void> _asyncInit() async {
var app = await Firebase.initializeApp(
name: "my-throwaway-project",
options: const FirebaseOptions(
apiKey: "AIzaSyBXOxFf_iXaer4tX-sE8eRrh77VftTKZI0",
appId: "1:980810897373:android:b1a4bcd50cd76712868834",
messagingSenderId: "980810897311",
projectId: "my-throwaway-project",
),
);
var db = FirebaseFirestore.instanceFor(app: app);
await db.collection("test1").add({"field1":"value1"}); // this line throws the exception
}
}
根据文档,似乎我正在正确地进行初始化,但仍然存在错误。
通常我们在运行应用程序之前在 main 上初始化 firebase .. 可能是这个问题..
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