FLutter FirebaseAuth Email 验证

Question

right now i try to code an own android App. therefore i wanted to create an e-mail and password based sign-in/ sign Up which also includes an E-mail Verification service. the problem is that, everytime i launch it in the Emulator, and try to register, it will just occure an nosuchmethod error that tells me that either the getter email or the getter sendEmailVerification() is called on null.

pls have a look at my verification-code and tell me what i did wrong.

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'home.dart';






class Verification extends StatefulWidget {
  @override
  _VerificationState createState() => _VerificationState();
}

class _VerificationState extends State<Verification> {
  final auth = FirebaseAuth.instance;
  User user;
  Timer timer;
  String email =  FirebaseAuth.instance.currentUser.email.toString(); 


 Future<void> verificateEmail() async{
   User user = auth.currentUser;

   if (user != null) {
     await user.sendEmailVerification();}
    timer = Timer.periodic(Duration(seconds: 2), (timer) {checkEmailVerified(); });

 }
    
   
  
  
  
  
  @override
  void dispose() {
    timer.cancel();
    super.dispose();
  }




  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text("draicksmail sent to ${user.email}"),
      ),
    );
  }




  Future<void> checkEmailVerified() async{
    user = auth.currentUser;
    await user.reload();
    if (user.emailVerified){
      timer.cancel();
      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (context)=> Home()));
    }
  }


    
  

}

Answer 1

So this error is caused because auth.currentUser returns null . Therefore trying to execute a method on null throws an error because nothing exists on null .

Have you added the following to your main() method?

await Firebase.initializeApp();
runApp(Home());

Checkout the following guide for more detailshttps://firebase.google.com/docs/flutter/setup?platform=android