Shared preferences example

shared_prefs.dart

//yaml: shared_preferences:
//main.dart

void main() async {
  
  WidgetsFlutterBinding.ensureInitialized();
  final prefs = new MyShPrefs();
  await prefs.initPrefs();

  runApp(...);

//
class SharedPrefsManagerCustom {
  static const _sessionToken = "session_token";
  
  static final SharedPrefsManagerCustom _instance = SharedPrefsManagerCustom._internal();

  factory SharedPrefsManagerCustom() => _instance;

  SharedPrefsManagerCustom._internal();

  static late SharedPreferences _prefs;

  /// Call before to init the application
  static Future initPrefs() async =>
      _prefs = await SharedPreferences.getInstance();

  // Functions
  static Future<bool> clean() async => await _prefs.clear();

  static set sessionToken(String? value) =>
      _prefs.setString(_sessionToken, value ?? '');

  /// This value can be empty
  static String? get sessionToken => _prefs.getString(_sessionToken) ?? null;


}