해당 오류와 같은 문제가 발생하는데 제가 뭘 빼먹었을까요 ?

Question

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════ The following FirebaseException was thrown building StreamBuilder(state: _StreamBuilderBaseState>#fe17e): [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp() The relevant error-causing widget was: StreamBuilder file:///C:/Users/PC/AndroidStudioProjects/instagram_clone/lib/root_page.dart:10:12 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 new _LoginPageState (package:instagram_clone/login_page.dart:14:43) #4 LoginPage.createState (package:instagram_clone/login_page.dart:9:36) ... ════════════════════════════════════════════════════════════════════════════════════════════════════

오준석 · Answer

첫번째 질문은 강의 촬영 당시와 버전이 달라져서 사용방법이 달라져서 그런 것 같습니다. Firebase.initializeApp() 을 호출해야 하는데 https://pub.dev/packages/firebase_auth/example 사이트의 샘플을 참고하여 main 메서드를 다음과 같이 작성해 보세요. Future< void > main() async { WidgetsFlutterBinding.ensureInitialized(); await Firebase.initializeApp(); runApp(AuthExampleApp()); } 두번째 질문은 역시 버전업에 따라 사용 방법이 달라져서 그러니 FirebaseUser user 부분을 수정된 방법으로 사용하시기 바랍니다. 이 부분은 제 소스에 반영해 두었으니 참고해 주세요. https://github.com/junsuk5/flutter_insta_clon/blob/master/lib/login_page.dart Future _handleSignIn() async { GoogleSignInAccount googleUser = await _googleSignIn.signIn(); GoogleSignInAuthentication googleAuth = await googleUser.authentication; FirebaseUser user = (await _auth.signInWithCredential( GoogleAuthProvider.getCredential( idToken: googleAuth.idToken, accessToken: googleAuth.accessToken))).user; print("signed in " + user.displayName); return user; }

도장호 · Answer

아.. 그리고 구글 로그인 후 => 탭 페이지로 이동되지 않고 아래와 같은 메시지가 뜨는데 어떤걸까요.. ? I/BiChannelGoogleApi(21852): [FirebaseAuth: ] getGoogleApiForMethod() returned Gms: com.google.firebase.auth.api.internal.zzaq@53783c9 D/FirebaseAuth(21852): Notifying id token listeners about user ( JkAgW8bUPWZ6WWe8s1eZZxfJRj23 ). E/flutter (21852): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: type 'User' is not a subtype of type 'FirebaseUser' E/flutter (21852): #0 _LoginPageState._handleSignIn (package:instagram_clone/login_page.dart:47:24) E/flutter (21852): E/flutter (21852): #1 _LoginPageState.build. (package:instagram_clone/login_page.dart:33:17) E/flutter (21852): #2 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19) E/flutter (21852): #3 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:1098:38) E/flutter (21852): #4 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24) E/flutter (21852): #5 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11) E/flutter (21852): #6 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5) E/flutter (21852): #7 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:219:7) E/flutter (21852): #8 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:477:9) E/flutter (21852): #9 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:78:12) E/flutter (21852): #10 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:124:9) E/flutter (21852): #11 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8) E/flutter (21852): #12 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:122:18) E/flutter (21852): #13 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:108:7) E/flutter (21852): #14 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:220:19) E/flutter (21852): #15 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22) E/flutter (21852): #16 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7) E/flutter (21852): #17 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7) E/flutter (21852): #18 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7) E/flutter (21852): #19 _rootRunUnary (dart:async/zone.dart:1206:13) E/flutter (21852): #20 _CustomZone.runUnary (dart:async/zone.dart:1100:19) E/flutter (21852): #21 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7) E/flutter (21852): #22 _invoke1 (dart:ui/hooks.dart:267:10) E/flutter (21852): #23 _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5) E/flutter (21852):