I was following a tutorial to create an authentication system in flutter using firebase. Registration works as intended and the user is posted to my firebase database, however, when I try to login with the correct credentials, I get:
I/flutter (26424): user A [email protected] added I/InputMethodManager(26424): showSoftInput I/InputMethodManager(26424): mServedView =com.waifuhub.app;view =com.waifuhub.app;flags =0 I/HwSecImmHelper(26424): mSecurityInputMethodService is null W/InputMethodManager(26424): startInputReason = 3 W/IInputConnectionWrapper(26424): getTextBeforeCursor on inactive InputConnection W/IInputConnectionWrapper(26424): getSelectedText on inactive InputConnection W/IInputConnectionWrapper(26424): getTextAfterCursor on inactive InputConnection W/IInputConnectionWrapper(26424): requestCursorAnchorInfo on inactive InputConnection I/InputMethodManager(26424): showSoftInput I/InputMethodManager(26424): mServedView =com.waifuhub.app;view =com.waifuhub.app;flags =0 I/HwSecImmHelper(26424): mSecurityInputMethodService is null W/InputMethodManager(26424): startInputReason = 3 V/AudioManager(26424): playSoundEffect effectType: 0 V/AudioManager(26424): querySoundEffectsEnabled... I/HwSecImmHelper(26424): mSecurityInputMethodService is null I/ViewRootImpl(26424): jank_removeInvalidNode all the node in jank list is out of time I/flutter (26424): Sign In Error: NoSuchMethodError: The getter 'data' was called on null. I/flutter (26424): Receiver: null I/flutter (26424): Tried calling: data Application finished. Exited (sigterm) The code responsible for signing in is as follows:
void _emailLogin( {String email, String password, BuildContext context}) async { if (_formKey.currentState.validate()) { try { SystemChannels.textInput.invokeMethod('TextInput.hide'); await _changeLoadingVisible(); //need await so it has chance to go through error if found. await StateWidget.of(context).logInUser(email, password); await Navigator.pushNamed(context, '/'); } catch (e) { _changeLoadingVisible(); print("Sign In Error: $e"); String exception = Auth.getExceptionText(e); Flushbar( title: "Sign In Error", message: exception, duration: Duration(seconds: 5), )..show(context); } } else { setState(() => _autoValidate = true); } } class StateWidget extends StatefulWidget { final StateModel state; final Widget child; StateWidget({ @required this.child, this.state, }); // Returns data of the nearest widget _StateDataWidget // in the widget tree. static _StateWidgetState of(BuildContext context) { return context.dependOnInheritedWidgetOfExactType<_StateDataWidget>().data; } @override _StateWidgetState createState() => new _StateWidgetState(); } class _StateWidgetState extends State<StateWidget> { StateModel state; //GoogleSignInAccount googleAccount; //final GoogleSignIn googleSignIn = new GoogleSignIn(); @override void initState() { super.initState(); if (widget.state != null) { state = widget.state; } else { state = new StateModel(isLoading: true); initUser(); } } Future<Null> initUser() async { //print('...initUser...'); FirebaseUser firebaseUserAuth = await Auth.getCurrentFirebaseUser(); User user = await Auth.getUserLocal(); Settings settings = await Auth.getSettingsLocal(); setState(() { state.isLoading = false; state.firebaseUserAuth = firebaseUserAuth; state.user = user; state.settings = settings; }); } Future<void> logOutUser() async { await Auth.signOut(); FirebaseUser firebaseUserAuth = await Auth.getCurrentFirebaseUser(); setState(() { state.user = null; state.settings = null; state.firebaseUserAuth = firebaseUserAuth; }); } Future<void> logInUser(email, password) async { String userId = await Auth.signIn(email, password); User user = await Auth.getUserFirestore(userId); await Auth.storeUserLocal(user); Settings settings = await Auth.getSettingsFirestore(userId); await Auth.storeSettingsLocal(settings); await initUser(); } @override Widget build(BuildContext context) { return new _StateDataWidget( data: this, child: widget.child, ); } } class _StateDataWidget extends InheritedWidget { final _StateWidgetState data; _StateDataWidget({ Key key, @required Widget child, @required this.data, }) : super(key: key, child: child); // Rebuild the widgets that inherit from this widget // on every rebuild of _StateDataWidget: @override bool updateShouldNotify(_StateDataWidget old) => true; } static Future<String> signIn(String email, String password) async { FirebaseUser user = (await FirebaseAuth.instance .signInWithEmailAndPassword(email: email, password: password)) .user; return user.uid; } class Validator { static String validateEmail(String value) { Pattern pattern = r'^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-zA-Z]+'; RegExp regex = new RegExp(pattern); if (!regex.hasMatch(value)) return 'Please enter a valid email address.'; else return null; } static String validatePassword(String value) { Pattern pattern = r'^.{6,}$'; RegExp regex = new RegExp(pattern); if (!regex.hasMatch(value)) return 'Password must be at least 6 characters.'; else return null; } static String validateName(String value) { Pattern pattern = r"^[a-zA-Z]+(([',. -][a-zA-Z ])?[a-zA-Z]*)*$"; RegExp regex = new RegExp(pattern); if (!regex.hasMatch(value)) return 'Please enter a name.'; else return null; } static String validateNumber(String value) { Pattern pattern = r'^\D?(\d{3})\D?\D?(\d{3})\D?(\d{4})$'; RegExp regex = new RegExp(pattern); if (!regex.hasMatch(value)) return 'Please enter a number.'; else return null; } } And my dependencies in pubsec.yaml:
dependencies: flutter: sdk: flutter flutter_launcher_icons: ^0.7.2 cupertino_icons: ^0.1.2 firebase_auth: ^0.15.5+3 cloud_firestore: ^0.13.4+2 flushbar: 1.9.1 shared_preferences: ^0.5.6+3 dev_dependencies: flutter_test: sdk: flutter Upon further debugging, I think the error is due to the fact that null context is being passed to _StateWidgetState, however, I am not sure if this is so, or how to solve this. Any help would be highly appreciated!
