How to call a function from another file in Flutter?

Question

I am new to dart and am trying to call a function from my auth.dart file in my sign in page I tried many solutions but it did'nt work out, so any NEW Ideas? This is my auth file:

abstract class BaseAuth{
  Future<FirebaseUser> currentUser();
  Future<String> signIn(String email, String password);
  Future<String> createUser(String email, String password);
  Future<void> signOut();
  Future<String> getEmail();
  Future<bool> isEmailVerified();
  Future<void> resetPassword(String email);
  Future<void> sendEmailVerification();
}
class Auth implements BaseAuth{
  final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
  Future<String> signIn(String email, String password) async {
    FirebaseUser user = (await _firebaseAuth.signInWithEmailAndPassword(email: email, password: password)) as FirebaseUser;
    return user.uid;
  }
  Future<String> createUser(String email, String password) async {
    FirebaseUser user = (await _firebaseAuth.createUserWithEmailAndPassword(email: email, password: password)) as FirebaseUser;
    return user.uid;
  }
  Future<FirebaseUser> currentUser() async {
    FirebaseUser user = await _firebaseAuth.currentUser();
    print("uid ${user.uid}");
    return user;
  }
  Future<String> getEmail() async{
    FirebaseUser user = await _firebaseAuth.currentUser();
    return user.email;
  }
  Future<void> signOut() async {
    return _firebaseAuth.signOut();
  }
  Future<bool> isEmailVerified() async{
    FirebaseUser user = await _firebaseAuth.currentUser();
    return user.isEmailVerified;
  }
  Future<void> resetPassword(String email) async{
    return _firebaseAuth.sendPasswordResetEmail(email: email);
  }
  Future<void> sendEmailVerification() async{
    FirebaseUser user = await _firebaseAuth.currentUser();
    return user.sendEmailVerification();
  }
}

Benedikt J Schlegel · Accepted Answer · 2020-05-29T15:16:06.933

1

first you need to import the file. Do this at the very top of your file. You need to provide the path to the file from the current file location. So if current file is in /lib and the new file is in /lib/widgets your path is "widgets/new.dart". You can go up a folder like this "../new.dart"

import 'new.dart';

Then instantiate an object of your class and use that object to call functions.

New x = New();
x.getFromOtherFile();

"New" is my class name in this example.

edited May 29 '20 at 15:16

answered May 29 '20 at 15:13

Benedikt J Schlegel

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what is the "New"?? – Omar Yacop May 29 '20 at 15:15
New is my class name. In your case it would be "Auth" – Benedikt J Schlegel May 29 '20 at 15:16
But not in your import. There use the actual file name. – Benedikt J Schlegel May 29 '20 at 15:19
Thanks but I have another proplem can u help me ? – Omar Yacop May 29 '20 at 15:26
@OmarYacop Sure, what is it – Benedikt J Schlegel May 29 '20 at 15:27
Thanks @Benedikt J Schalegel – Omar Yacop May 29 '20 at 15:28
Here : The argument type 'Future' can't be assigned to the parameter type 'void Function()'. – Omar Yacop May 29 '20 at 15:28
You might want to open a question and post your code there. Makes it much easier to see whats going on. Just link me to it so i can take a look. – Benedikt J Schlegel May 29 '20 at 15:30
Sorry but how I link u to it – Omar Yacop May 29 '20 at 15:31
Just open another question like this one, and comment the link here. – Benedikt J Schlegel May 29 '20 at 15:32
https://stackoverflow.com/questions/62089554/what-to-do-if-i-cant-assign-future-functions-to-onpressed-in-flutter here – Omar Yacop May 29 '20 at 15:34

How to call a function from another file in Flutter?

1 Answers1