No se ha creado ninguna aplicación de Firebase '[DEFAULT]': llame a Firebase.initializeApp() en Flutter y Firebase
Estoy creando una aplicación Flutter y he integrado Firebase, pero sigo recibiendo este error cuando hago clic en un botón para registrarme, iniciar sesión o cerrar sesión. He visto a otras personas hacer la misma pregunta, pero ninguna parece funcionar para mí. Estoy usando Flutter y Android Studio . ¿Como puedo solucionar este problema?
Este es un extracto de mi código.
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.red,
body: Center(
child: Container(
child: RaisedButton(
onPressed: () {
FirebaseAuth.instance.signOut().then((value) {
Navigator.pushReplacement(
context,
MaterialPageRoute(
builder: (context) =>
LoginScreen()));
});
},
child: Text("Logout"),
)
)
)
);
}
}
A continuación se muestra la excepción lanzada.
══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following FirebaseException was thrown while handling a gesture:
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()
When the exception was thrown, this was the stack:
#0 MethodChannelFirebase.app (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:118:5)
#1 Firebase.app (package:firebase_core/src/firebase.dart:52:41)
#2 FirebaseAuth.instance (package:firebase_auth/src/firebase_auth.dart:37:47)
#3 _HomeScreenState.build.<anonymous closure> (package:cosytok/screens/home.dart:20:28)
#4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
#5 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
#6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
#7 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
#8 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
#9 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:219:7)
#10 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:477:9)
#11 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:78:12)
#12 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:124:9)
#13 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
#14 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:122:18)
#15 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:108:7)
#16 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:220:19)
#17 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
#18 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
#19 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
#20 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
#24 _invoke1 (dart:ui/hooks.dart:267:10)
#25 _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)
(elided 3 frames from dart:async)
Handler: "onTap"
Recognizer:
TapGestureRecognizer#f0104
════════════════════════════════════════════════════════════════════════════════════════════════════
════════ Exception caught by gesture ═══════════════════════════════════════════════════════════════
The following FirebaseException was thrown while handling a gesture:
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()
Aceptado
A partir del 17 de agosto de 2020
Todas las versiones de Firebase se han actualizado y ahora debes llamar Firebase.initializeApp()antes de usar cualquier producto de Firebase, por ejemplo:
Primero, todos los productos de Firebase ahora dependen de firebase_corela versión (0.5.0+), por lo tanto, debes agregarla en el pubspec.yamlarchivo:
dependencies:
flutter:
sdk: flutter
firebase_core : ^0.5.0
# cloud_firestore: ^0.14.0 other firebase dependencies
Entonces tienes que llamar Firebase.initializeApp():
Primer ejemplo
import 'package:flutter/material.dart';
// Import the firebase_core plugin
import 'package:firebase_core/firebase_core.dart';
void main() {
runApp(App());
}
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return FutureBuilder(
// Initialize FlutterFire
future: Firebase.initializeApp(),
builder: (context, snapshot) {
// Check for errors
if (snapshot.hasError) {
return SomethingWentWrong();
}
// Once complete, show your application
if (snapshot.connectionState == ConnectionState.done) {
return MyAwesomeApp();
}
// Otherwise, show something whilst waiting for initialization to complete
return Loading();
},
);
}
}
Segundo ejemplo con Firestore:
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: FirstRoute(title: 'First Route'),
);
}
}
class FirstRoute extends StatefulWidget {
FirstRoute({Key key, this.title}) : super(key: key);
final String title;
@override
_FirstRouteState createState() => _FirstRouteState();
}
class _FirstRouteState extends State<FirstRoute> {
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("test"),
),
body: FutureBuilder(
future: getData(),
builder: (context, AsyncSnapshot<DocumentSnapshot> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
return Column(
children: [
Container(
height: 27,
child: Text(
"Name: ${snapshot.data.data()['name']}",
overflow: TextOverflow.fade,
style: TextStyle(fontSize: 20),
),
),
],
);
} else if (snapshot.connectionState == ConnectionState.none) {
return Text("No data");
}
return CircularProgressIndicator();
},
));
}
Future<DocumentSnapshot> getData() async {
await Firebase.initializeApp();
return await FirebaseFirestore.instance
.collection("users")
.doc("docID")
.get();
}
}
Tercer ejemplo:
Inicialícelo y initState()luego llame a setState()cuál llamará al build()método.
@override
void initState() {
super.initState();
Firebase.initializeApp().whenComplete(() {
print("completed");
setState(() {});
});
}
Cuarto ejemplo:
Inicialízalo en el main()método después de llamar.WidgetsFlutterBinding.ensureInitialized();
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
Nota : Sólo tienes que llamar initializeApp()una vez
Agregar a pubspec.yaml
firebase_core :agregar a main.dart
import 'package:firebase_core/firebase_core.dart'; void main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(); runApp(MyApp()); }
