我知道我必须做Firebase.initializeApp((，但我不知道该把它放在哪里，我尝试了一些关于同一问题的其他问题的答案，但没有一个有效。
我还尝试在void main((中添加WidgetsFlutterBinding.ensureInitialized();等待Firebase.initializeApp();
Main.dart
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
final AuthenticationService _authenticationService =
AuthenticationService();
final AuthenticationBloc _authenticationBloc =
AuthenticationBloc(_authenticationService);
return AuthenticationBlocProvider(
authenticationBloc: _authenticationBloc,
key: null,
child: StreamBuilder(
initialData: null,
stream: _authenticationBloc.user,
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return Container(
color: Colors.pink,
child: CircularProgressIndicator(),
);
} else if (snapshot.hasData) {
return HomeBlocProvider(
homeBloc: HomeBloc(DbFirestoreService(),
_authenticationService), // Inject the DbFirestoreService() & AuthenticationService()
uid: snapshot.data,
key: null,
child: _buildMaterialApp(HomePage()),
);
} else {
return _buildMaterialApp(Login());
}
},
),
);
}
MaterialApp _buildMaterialApp(Widget homePage) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Journal',
theme: ThemeData(
primarySwatch: Colors.lightGreen,
canvasColor: Colors.lightGreen.shade50,
bottomAppBarColor: Colors.lightGreen,
),
home: homePage,
);
}
}
auth.dart
class AuthenticationService implements AuthenticationApi {
final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
FirebaseAuth getFirebaseAuth() {
return _firebaseAuth;
}
Future<String> currentUserUid() async {
var user = _firebaseAuth.currentUser;
return user!.uid;
}
Future<void> signOut() async {
return _firebaseAuth.signOut();
}
Future<String> signInWithEmailAndPassword(
{required String email, required String password}) async {
final UserCredential user = await _firebaseAuth.signInWithEmailAndPassword(
email: email, password: password);
return user.user!.uid;
}
Future<String> createUserWithEmailAndPassword(
{required String email, required String password}) async {
final UserCredential user = await _firebaseAuth
.createUserWithEmailAndPassword(email: email, password: password);
return user.user!.uid;
}
}
我是新来的。感谢的帮助
您应该这样初始化您的Firebase：
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
确保导入Firebase核心
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
...
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp({
appId: 'your_app_id',
apiKey: 'your_db_api_key',
messagingSenderId: 'your_sender_id',
projectId: 'your_project name',
});
runApp(MyApp());
}
...
这些app_id、api_key、sender_id和project_name将很容易从firebase控制台中获得。