Flutter - How to pass user data to all views

Question

I\'m new to the flutter world and mobile app development and struggling with how I should pass user data throughout my app.

I\'ve tried several things, but none seem gre

Answer 1

I prefer to use Services with Locator, using Flutter get_it.

Create a UserService with a cached data if you like:

class UserService {
  final Firestore _db = Firestore.instance;
  final String _collectionName = 'users';
  CollectionReference _ref;

  User _cachedUser; //<----- Cached Here

  UserService() {
    this._ref = _db.collection(_collectionName);
  }

  User getCachedUser() {
    return _cachedUser;
  }

  Future getUser(String id) async {
    DocumentSnapshot doc = await _ref.document(id).get();

    if (!doc.exists) {
      log("UserService.getUser(): Empty companyID ($id)");
      return null;
    }

    _cachedUser = User.fromDocument(doc.data, doc.documentID);
    return _cachedUser;
  }
}

Then create create a Locator

GetIt locator = GetIt.instance;

void setupLocator() {
  locator.registerLazySingleton(() => new UserService());
}

And instantiate in main()

void main() {
  setupLocator();
  new Routes();
}

That's it! You can call your Service + cachedData everywhere using:

.....
UserService _userService = locator();

@override
void initState() {
  super.initState();
  _user = _userService.getCachedUser();
}