How to log out user and How to check user verify mail - flutter

Question

I got the following problem.
When user register he will be on a page, where I show a message like check your Email account. And when user check his account and confirm his mail he automatically get to homepage. So far so good. But when user press register button an get mail and reload the page he get also inside homepage without confirm his mail.
I trie this
Future<String> signIN(String email, String password) async {
try {
UserCredential result =await FirebaseAuth.instance.signInWithEmailAndPassword(
email: email.trim(),
password: password,
);
User user = result.user;
if(user.emailVerified){
return user.uid;
}
} on FirebaseAuthException catch (e) {
but not working.
here's my verify email page
import 'dart:async';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:projectandroidstudiodenya/seitenleiste/homepage.dart';
class VerifyScreen extends StatefulWidget {
#override
_VerifyScreenState createState() => _VerifyScreenState();
}
class _VerifyScreenState extends State<VerifyScreen> {
final auth= FirebaseAuth.instance;
User user;
Timer timer;
#override
void initState() {
user= auth.currentUser;
user.sendEmailVerification();
timer= Timer.periodic(Duration(seconds: 5), (timer) {
checkEmailverifyed();
});
super.initState();
}
#override
void dispose() {
timer.cancel();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body:Center(
)
);
}
Future<void> checkEmailverifyed() async{
user=auth.currentUser;
await user.reload();
if(user.emailVerified){
timer.cancel();
Navigator.of(context).
pushReplacement(MaterialPageRoute(builder:(context)=> Homepage()));
}
}
}
Maybe anyone can help.
And also when user press logout button nothing happened. but when user restart the app he logged out.
here's my logout pressed method:
onPressed: () {
FirebaseAuth.instance.signOut();
FirebaseAuth.instance.signOut();Navigator.pushNamedAndRemoveUntil(context, LoginScreen.route, (route) => false);
Heres the error of the sign out:
D/FirebaseAuth(26776): Notifying id token listeners about a sign-out event.
D/FirebaseAuth(26776): Notifying auth state listeners about a sign-out event.
E/flutter (26776): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Could not find a generator for route RouteSettings("SignIn", null) in the _WidgetsAppState.
E/flutter (26776): Make sure your root app widget has provided a way to generate
E/flutter (26776): this route.
E/flutter (26776): Generators for routes are searched for in the following order:
E/flutter (26776): 1. For the "/" route, the "home" property, if non-null, is used.
E/flutter (26776): 2. Otherwise, the "routes" table is used, if it has an entry for the route.
E/flutter (26776): 3. Otherwise, onGenerateRoute is called. It should return a non-null value for any valid route not handled by "home" and "routes".
E/flutter (26776): 4. Finally if all else fails onUnknownRoute is called.
E/flutter (26776): Unfortunately, onUnknownRoute was not set.
E/flutter (26776): #0 _WidgetsAppState._onUnknownRoute.<anonymous closure> (package:flutter/src/widgets/app.dart:1219:9)
E/flutter (26776): #1 _WidgetsAppState._onUnknownRoute (package:flutter/src/widgets/app.dart:1234:6)
E/flutter (26776): #2 NavigatorState._routeNamed (package:flutter/src/widgets/navigator.dart:4148:37)
E/flutter (26776): #3 NavigatorState.pushNamedAndRemoveUntil (package:flutter/src/widgets/navigator.dart:4391:34)
E/flutter (26776): #4 Navigator.pushNamedAndRemoveUntil (package:flutter/src/widgets/navigator.dart:2042:34)
E/flutter (26776): #5 _openSignOutDrawer.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:projectandroidstudiodenya/seitenleiste/seitenleiste.dart:188:90)
E/flutter (26776): #6 _rootRunUnary (dart:async/zone.dart:1362:47)
E/flutter (26776): #7 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
E/flutter (26776): <asynchronous suspension>
E/flutter (26776):
And the error of the sig in:
E/flutter (26776): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The getter 'emailVerified' was called on null.
E/flutter (26776): Receiver: null
E/flutter (26776): Tried calling: emailVerified
E/flutter (26776): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
E/flutter (26776): #1 AuthService.signIN (package:projectandroidstudiodenya/services/auth.dart:44:44)
E/flutter (26776): #2 _LoginScreenState._buildLoginBtn.<anonymous closure> (package:projectandroidstudiodenya/authenticate/signin.dart:170:48)
E/flutter (26776): #3 _LoginScreenState._buildLoginBtn.<anonymous closure> (package:projectandroidstudiodenya/authenticate/signin.dart:168:24)
E/flutter (26776): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:994:20)
E/flutter (26776): #5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (26776): #6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:607:11)
E/flutter (26776): #7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
E/flutter (26776): #8 BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:267:7)
E/flutter (26776): #9 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
E/flutter (26776): #10 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:443:20)
E/flutter (26776): #11 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:419:22)
E/flutter (26776): #12 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:288:11)
E/flutter (26776): #13 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
E/flutter (26776): #14 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
E/flutter (26776): #15 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
E/flutter (26776): #16 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
E/flutter (26776): #17 _rootRunUnary (dart:async/zone.dart:1370:13)
E/flutter (26776): #18 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
E/flutter (26776): #19 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1170:7)
E/flutter (26776): #20 _invoke1 (dart:ui/hooks.dart:186:10)
E/flutter (26776): #21 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:282:7)
E/flutter (26776): #22 _dispatchPointerDataPacket (dart:ui/hooks.dart:96:31)
E/flutter (26776):
My sig in method looks like that:
Future<String> signIN(String email, String password) async {
try {
if(FirebaseAuth.instance.currentUser.emailVerified) {
( await _auth.signInWithEmailAndPassword(
email: email.trim(), password: password,)).user;
// User user = result.user;
}
} on FirebaseAuthException catch (e) {
switch (e.code) {
case 'invalid-email':
{
return 'Email is not valid';
}
case 'user-disabled':
{
return 'Account is not active';
}
case 'user-not-found':
{
return 'No user found';
}
case 'wrong-password':
{
return 'wrong password';
}
default:
{
return 'Unexpected error!';
}
}
}
return null;
}
It looks different because I changed it like it was before that so I can check if maybe it was on the changes it do because it runs at this point.

Answer 1

You should check email verification within you're sign-in method, and if the email was verified then return instance.signInWithEmailAndPassword.
full code:
Future<String> signIN(String email, String password) async {
try {
if(FirebaseAuth.instance.currentUser.emailVerified) {
( await _auth.signInWithEmailAndPassword(
email: email.trim(), password: password,)).user;
return "success";
// User user = result.user;
}
} on FirebaseAuthException catch (e) {
switch (e.code) {
case 'invalid-email':
{
return 'Email is not valid';
}
case 'user-disabled':
{
return 'Account is not active';
}
case 'user-not-found':
{
return 'No user found';
}
case 'wrong-password':
{
return 'wrong password';
}
default:
{
return 'Unexpected error!';
}
}
}
return return "error";;
}
so every moment when signIN calling it would check email verification and if it verified it would work if it isn't it will return "error" or other problem variants, and you can listen to response so when it gives you an error you should return a snackBar, if it returns "success" then you would navigate.
Solution of logout issue:
onPressed: () {
FirebaseAuth.instance.signOut().then((){
Navigator.pushNamedAndRemoveUntil(context, LoginScreen.route (route) => false);
});