title: Everytime i restart the app, it displays the login page, even when there is user data (flutter)
body: <p>As the title suggests, im only using <strong>signInWithGoogle()</strong> for my user auth, each time i restart the app it went to Login Page even when the user did not log out.</p>
  <p>I know this question has been asked plenty of times, im seeing many answers pointing towards using FirebaseAuth streambuilders but i cant seem to get it to work ... Sorry im a beginner and i do not understand much of the documentations too :(</p>
  <p>Is there anyway i can direct the users that are logged in to the main page, and those without user data will have to visit LoginPage first?</p>
  <p>sign_in.dart :</p>
  <pre><code>import 'package:confApp/main.dart';
  import 'package:firebase_auth/firebase_auth.dart' as fauth;
  import 'package:google_sign_in/google_sign_in.dart';
  import 'package:flutter/material.dart';
  
  String name;
  String email;
  String imageUrlGoogle;
  String id;
  
  final fauth.FirebaseAuth _auth = fauth.FirebaseAuth.instance;
  final GoogleSignIn googleSignIn = GoogleSignIn();
  
  Future&lt;bool&gt; signInWithGoogle() async {
    final GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
    final GoogleSignInAuthentication googleSignInAuthentication =
        await googleSignInAccount.authentication;
  
    final fauth.AuthCredential credential = fauth.GoogleAuthProvider.credential(
      accessToken: googleSignInAuthentication.accessToken,
      idToken: googleSignInAuthentication.idToken,
    );
  
    final fauth.UserCredential authResult = await _auth.signInWithCredential(credential);
    final fauth.User user = authResult.user;
  
    assert(!user.isAnonymous);
    assert(await user.getIdToken() != null);
    assert(user.email != null);
    assert(user.displayName != null);
    assert(user.photoURL != null);
    assert(user.uid != null);
  
    name = user.displayName;
    email = user.email;
    imageUrlGoogle = user.photoURL;
    id = user.uid;
  
    final fauth.User currentUser = _auth.currentUser;
    assert(user.uid == currentUser.uid);
  
    if ( fauth.FirebaseAuth.instance.currentUser != null) {
      return true;
    } else
      return false;
  
    // return 'signInWithGoogle succeeded: $user';
  }
  
  void signOutGoogle() async {
    await googleSignIn.signOut();
    print(&quot;User Sign Out&quot;);
  }
  </code></pre>
  <p>Let me know what other codes that you need, ill update the question with the codes. Thanks in advance!</p>