CODEWITHSUNDEEP
dartflutter
SJente
SJente

Reputation: 33

Flutter Shared Preferences Auth FIle

I'm trying to write an auth file, with a list of finals with shared preferences values in it. I could import that auth file in my other files and i could get like the name or email without importing shared preferences in every file.

It would probably look way smoother and cleaner.

I thought something like this would have worked but it didn't

/// ------------Auth------------ ///
final email = getEmail();

getEmail() async {
  final SharedPreferences prefs = await SharedPreferences.getInstance();
  return prefs.getString('email');
}

Does anybody have any idea how to do this?

Greetings, Jente

Upvotes: 0

Views: 1160

Answers (3)

danypata
danypata

Reputation: 10175

I assume you want to use the method in multiple files. The problem with your code is that the getEmail method is marked async that means it will have to return a Future. Think about it like this, when you mark a method as async it means it will return something (or finish executing) in the near future. When ? Well you don't know exactly when, so you'll need to get "notified" when the method is "done", that's why you'll use a Future. Something like this:

Future<String> getEmail() async {
  final SharedPreferences prefs = await SharedPreferences.getInstance();
  return prefs.getString('email');
}

class ThisIsTheClassWhereYouWantToUseTheFunction {
   //let's say you have a method in your class called like the one below (it can be any other name)
  void _iNeedTheEmailToPrintIt() {
     //this is the way you can call the method in your classes, this class is just an example.
     getEmail().then((thisIsTheResult){ // here you "register" to get "notifications" when the getEmail method is done.
        print("This is the email $thisIsTheResult");
     });
  }
}

Upvotes: 2

Akio Alex
Akio Alex

Reputation: 316

Try this;

  1. make dart file (Filename and Class Name ShareUtils)

add follow Code

import 'package:shared_preferences/shared_preferences.dart';
import 'dart:async';

class ShareUtils {
  static ShareUtils _instance;
  SharedPreferences ShareSave;

  factory ShareUtils() => _instance ?? new ShareUtils._();

  ShareUtils._();

  void Instatce() async {
    ShareSave = await SharedPreferences.getInstance();
  }

  Future<bool> set(key, value) async {
    return ShareSave.setString(key, value);
  }

  Future<String> get(key) async {
    return ShareSave.getString(key);
  }
}

2.Add main.dart

class MyApp extends StatelessWidget {
  static ShareUtils shareUtils;

  @override
  Widget build(BuildContext context) {
    ThemeData mainTheme = new ThemeData(
    );  
    shareUtils = new ShareUtils();
    shareUtils.Instatce();
    MaterialApp mainApp = new MaterialApp(
      title: "Your app",
      theme: mainTheme,
      home: new SplashPage(),
      debugShowCheckedModeBanner: true,
      routes: <String, WidgetBuilder>{
       "RegisterPage": (BuildContext context) => new RegisterPage(),
       "HomePage": (BuildContext context) => new HomePage(),         
     },
   );
    return mainApp;
  }
}

3.SET

void UserInfo(code, token) async{
    await MyApp.shareUtils.set("token", token);
    await MyApp.shareUtils.set("code", code);
    await Navigator.of(context).pushNamed("HomePage");
}

4.GET

Future NextPage() async {
MyApp.shareUtils.get("token").then((token) {
  print(token);
  if (token == null || token == "") {
    Navigator.of(context).popAndPushNamed("RegisterPage");
  } else {
    Navigator.of(context).popAndPushNamed("HomePage");
  }
});

}

Hope to help.

Upvotes: 0

Sean Urgel
Sean Urgel

Reputation: 264

you can define a class Auth or much better a scoped_model.

Here's a class implementation

class Auth {
   get email() {
       final SharedPreferences prefs = await SharedPreferences.getInstance();
       return prefs.getString('email');  
   }

   set email(String em) {
       final SharedPreferences prefs = await SharedPreferences.getInstance();
       pref.setString('email', em);
   }

}

and now you can call it in your widgets :)

Upvotes: 0

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