shared_prefs.dart

/// Use SharedPreferences in Flutter effortlessly
/// https://medium.com/@simonpham/use-sharedpreferences-in-flutter-effortlessly-835bba8f7418

// utils/shared_prefs.dart
class SharedPrefs {
  late final SharedPreferences _sharedPrefs;
  
  static final SharedPrefs _instance = SharedPrefs._internal();

  factory SharedPrefs() => _instance;

  SharedPrefs._internal();

  Future<void> init() async {
    _sharedPrefs = await SharedPreferences.getInstance();
  }

  String get username => _sharedPrefs.getString(keyUsername) ?? "";

  set username(String value) {
    _sharedPrefs.setString(keyUsername, value);
  }
}

// constants/strings.dart
const String keyUsername = "key_username";

// main.dart
Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await SharedPrefs().init();
  runApp(
    MyApp(),
  );
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Text("Hi ${SharedPrefs().username}"),
      ),
    );
  }
}

how to assign a value to sharedPrefs.username ?

how to assign a value to sharedPrefs.username ?

@ripesol just call sharedPrefs.username = "someName";

Thank you so much! , It's so easy to use shared preferences with your code.....They should have added your code below their official documentation.....It's so easy to use...
Thank you seariously!!!

Awesome! So easy!

Hi, I am new to Flutter and Dart, so maybe I am just ignoring something very trivial.

I am using your exact code, but when I run the app, I receive this error referring to row 6:

Error: Field '_sharedPrefs' should be initialized because its type 'SharedPreferences' doesn't allow
null.

Hi, I am new to Flutter and Dart, so maybe I am just ignoring something very trivial.

I am using your exact code, but when I run the app, I receive this error referring to row 6:

Error: Field '_sharedPrefs' should be initialized because its type 'SharedPreferences' doesn't allow
null.

I have updated the code to be compatible with null-safety. Thank you for reporting!

I have updated the code to be compatible with null-safety. Thank you for reporting!

So where is the update?

So where is the update?

@elinonga it's updated here.

Awesome. Thx !

Hi folks 👋
I have release a new package easy_hive, which is a better and simpler approach for storing key-value data instead of using shared_preferences. Please have a look.
Thank you so much!

🦊

Hi! I'm using this code but I get this error:
Undefined name '_internal'. Try correcting the name to one that is defined, or defining the name.

Thank you for your post in medium!

Hi! I'm using this code but I get this error: Undefined name '_internal'. Try correcting the name to one that is defined, or defining the name.

Make sure you didn't miss this line:

  SharedPrefs._internal();

Anyway, please check my above comment.

I'm sry I meant '_instance'. Anyway I'm checking your awesome package

I'm sry I meant '_instance'. Anyway I'm checking your awesome package

I have updated the code. Apologize for my mistake.

  static final SharedPrefs _instance = SharedPrefs._internal();

how many years experience in flutter?