Tidak ada Aplikasi Firebase '[DEFAULT]' yang telah dibuat - panggil Firebase.initializeApp () di Flutter dan Firebase
Saya sedang membangun Aplikasi flutter dan saya telah mengintegrasikan Firebase tetapi saya terus mendapatkan kesalahan ini ketika saya mengklik tombol untuk mendaftar, masuk, atau keluar. Saya telah melihat orang lain mengajukan pertanyaan yang sama tetapi tampaknya tidak ada yang berhasil untuk saya. Saya menggunakan flutter dan studio android. Ada yang bisa membantu?
Ini adalah kutipan dari kode saya
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"),
)
)
)
);
}
}
Di bawah ini adalah pengecualian yang diberikan
══╡ 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()
Jawaban
Mulai Sejak 17 Agustus 2020
Semua versi Firebase telah diupdate dan sekarang Anda harus menelepon Firebase.initializeApp()sebelum menggunakan produk Firebase apa pun, misalnya:
Pertama, semua produk Firebase sekarang bergantung pada firebase_coreversi (0.5.0+), oleh karena itu Anda perlu menambahkannya di pubspec.yamlfile:
dependencies:
flutter:
sdk: flutter
firebase_core : ^0.5.0
# cloud_firestore: ^0.14.0 other firebase dependencies
Kemudian Anda harus menelepon Firebase.initializeApp():
Contoh Pertama
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();
},
);
}
}
Contoh Kedua dengan 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();
}
}
Contoh Ketiga:
Inisialisasinya initState()kemudian panggil setState()yang akan memanggil build()metode tersebut.
@override
void initState() {
super.initState();
Firebase.initializeApp().whenComplete(() {
print("completed");
setState(() {});
});
}
Contoh Keempat:
Lakukan inisialisasi dalam main()metode setelah memanggilWidgetsFlutterBinding.ensureInitialized();
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
Catatan : Anda hanya perlu menelepon initializeApp()sekali
Tambahkan ke pubspec.yaml
firebase_core :tambahkan ke main.dart
import 'package:firebase_core/firebase_core.dart'; void main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(); runApp(MyApp()); }
Jika Anda ingin menghubungkan firebase dengan aplikasi flutter, Anda perlu mengaktifkan firebase sebelum menggunakannya. Anda dapat mendeklarasikannya seperti yang diberikan di bawah ini dan ini akan membantu Anda menyelesaikan masalah
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp());
}
Dalam video tersebut Anda akan mendapatkan detail tentang kesalahan tersebut
Berikut adalah solusi sederhana untuk ini:
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MyApp(),);
}
@ Jawaban peter adalah Sempurna !! tetapi Jika Anda masih mendapatkan kesalahan dalam kode Anda dan mengikuti codelab firebase flutter, perhatikan bahwa tutorial tersebut sudah usang pada Agustus 2020 dan belum diperbarui. Anda perlu melakukan banyak perubahan lain seperti:
- ganti
.datadengan.data() - ganti
updateDatadenganupdate
Semoga ini dapat membantu beberapa pemula seperti saya.
Jika Anda masih mengalami masalah saat meninggalkan aplikasi ke layar utama, Anda dapat menambahkan ini ke .dartfile apa pun menggunakan firebase:
class App extends StatelessWidget {
final Future<FirebaseApp> _initialization = Firebase.initializeApp();
@override
Widget build(BuildContext context) {
Atau dalam kasus StatefulWidget:
import 'package:flutter/material.dart';
// Import the firebase_core plugin
import 'package:firebase_core/firebase_core.dart';
void main() {
runApp(App());
}
class App extends StatefulWidget {
_AppState createState() => _AppState();
}
class _AppState extends State<App> {
// Set default `_initialized` and `_error` state to false
bool _initialized = false;
bool _error = false;
// Define an async function to initialize FlutterFire
void initializeFlutterFire() async {
try {
// Wait for Firebase to initialize and set `_initialized` state to true
await Firebase.initializeApp();
setState(() {
_initialized = true;
});
} catch(e) {
// Set `_error` state to true if Firebase initialization fails
setState(() {
_error = true;
});
}
}
@override
void initState() {
initializeFlutterFire();
super.initState();
}
@override
Widget build(BuildContext context) {
// Show error message if initialization failed
if(_error) {
return SomethingWentWrong();
}
// Show a loader until FlutterFire is initialized
if (!_initialized) {
return Loading();
}
return MyAwesomeApp();
}
}
Untuk informasi lebih lanjut, periksa tautan ini .
Jika Anda mengikuti jawaban Peter dan masih mendapatkan kesalahan yang sama, periksa untuk memastikan apa pun yang Anda miliki di mainfungsi Anda muncul setelah await Firebase.initializeApp()panggilan, seperti:
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
FirebaseCrashlytics.instance.setCrashlyticsCollectionEnabled(true);
FlutterError.onError = FirebaseCrashlytics.instance.recordFlutterError;
runApp(MyApp());
}
Pertama tambahkan ketergantungan ini:
firebase_core :
2: dalam fungsi utama proyek tambahkan 2 baris ini dan buat fungsi asinkron
void main() async {
// these 2 lines
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
//
runApp(MyApp());
}
sekarang Anda dapat menggunakan firebase secara normal di file atau widget apa pun dalam proyek.
Widget FutureBuilder juga akan berfungsi, tetapi Anda harus menambahkannya setiap kali ingin mengakses firebase.
Anda perlu menambahkan await Firebase.initializeApp();yang merupakan file Future. Lakukan di dalam file dart yang menjalankan fungsi Firebase Anda seperti di bawah ini:
import 'package:firebase_core/firebase_core.dart';
...
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(MaterialApp());
}