Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized

[draylegend]

Hi @escamoteur and thank you for your talk last week in Köln :) so I decided to give get_it a try but unfortunately got into troubles.

How can I use AuthService inside of ExpertService?

// main.dart

import 'package:my-app/features/utils.dart';

void main() {
  registerServices();
  runApp(App());
}

// utils.dart

import 'package:get_it/get_it.dart';

final GetIt getIt = GetIt.I;

void registerServices() {
  getIt.registerSingleton(AuthService());
  getIt.registerSingleton(NavService());
  getIt.registerSingleton(ExpertService());
}

// auth.service.dart

import 'package:firebase_auth/firebase_auth.dart';

class AuthService {
  FirebaseAuth _auth = FirebaseAuth.instance;

  Stream<FirebaseUser> get firebaseUser$ => _auth.onAuthStateChanged;

  void signIn(String email, String password) async {
    try {
      await _auth.signInWithEmailAndPassword(email: email, password: password);
    } catch (e) {
      print('!!! ${e.message} !!!');
    }
  }
}

// expert.service.dart

import 'package:rxdart/rxdart.dart';
import 'package:my-app/core/services/database/database.service.dart';
import 'package:my-app/features/auth/auth.service.dart';
import 'package:my-app/features/expert/expert.model.dart';
import 'package:my-app/features/utils.dart';

// DatabaseService handles document reads and writes
class ExpertService extends DatabaseService<Expert> {
  Stream<Expert> get model$ => FirebaseAuth.instance.onAuthStateChanged
      .switchMap((user) => user == null ? Stream.empty() : getData$(user.uid));

  ExpertService() : super('experts');
}

The error :(

[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.
#0      defaultBinaryMessenger.<anonymous closure> (package:flutter/src/services/binary_messenger.dart:76:7)
#1      defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:89:4)
#2      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
#3      MethodChannel.setMethodCallHandler (package:flutter/src/services/platform_channel.dart:375:5)
#4      new MethodChannelFirestore (package:cloud_firestore_platform_interface/src/method_channel/method_channel_firestore.dart:27:13)
#5      FirestorePlatform.instance (package:cloud_firestore_platform_interface/cloud_firestore_platform_interface.dart:62:19)
#6      new Firestore (package:cloud_firestore/src/firestore.dart:26:42)
#7      Firestore.instance (package:cloud_firestore/src/firestore.dart:29:36)
#8      new DatabaseService (package:my-app/core/services/database/database.service.dart:8:41)
#9      new ExpertService (package:my-app/features/expert/expert.service.dart)
#10     registerServices (package:my-app/features/utils.dart:13:27)
#11     main (package:my-app/main.dart:11:3)
#12     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25)
#13     _rootRun (dart:async/zone.dart:1126:13)
#14     _CustomZone.run (dart:async/zone.dart:1023:19)
#15     _runZoned (dart:async/zone.dart:1518:10)
#16     runZoned (dart:async/zone.dart:1502:12)
#17     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5)
#18     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19)
#19     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)

Thank you in advance and I hope you can help me!

[escamoteur]

I think it's exactly stated in your error message:

If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.