//
//
// class SecureStorageApp {
//   SecureStorageApp._privateConstructor();
//
//   static final SecureStorageApp _secureStorageApp = SecureStorageApp._privateConstructor();
//   factory SecureStorageApp() {
//     return _secureStorageApp;
//   }
//
//   saveValue(String key, String? value) async {
//      LocalStorage storage = LocalStorage('ob.edu.vn');
//      await storage.setItem(key,value);
//   }
//
//   String getValueString(String key) {
//     LocalStorage storage = LocalStorage('ob.edu.vn');
//     return storage.getItem(key)==null?'':storage.getItem(key);
//   }
//
//   static clear() async {
//     LocalStorage storage = LocalStorage('ob.edu.vn');
//     return await storage.clear();
//   }
//
//   deleteValue(String key) async {
//     LocalStorage storage = LocalStorage('ob.edu.vn');
//     await storage.deleteItem(key);
//   }
// }
