有没有更好的方法在Flutter中处理用户会话，而不是使用"flutter_session“或"local_storage"，或者不可能在移动设备上处理？

import 'package:shared_preferences/shared_preferences.dart';

Future<void> saveSession(String key, String value) async {
  final prefs = await SharedPreferences.getInstance();
  await prefs.setString(key, value);
}

Future<String?> getSession(String key) async {
  final prefs = await SharedPreferences.getInstance();
  return prefs.getString(key);
}

import 'package:hive/hive.dart';

void main() async {
  await Hive.initFlutter();
  await Hive.openBox('user_session');
}

void saveSession(String key, String value) {
  var box = Hive.box('user_session');
  box.put(key, value);
}

String? getSession(String key) {
  var box = Hive.box('user_session');
  return box.get(key);
}

import 'package:firebase_auth/firebase_auth.dart';

Future<void> loginUser(String email, String password) async {
  try {
    await FirebaseAuth.instance.signInWithEmailAndPassword(email: email, password: password);
  } catch (e) {
    print(e);
  }
}

Future<void> logoutUser() async {
  try {
    await FirebaseAuth.instance.signOut();
  } catch (e) {
    print(e);
  }
}

import 'package:keychain/keychain.dart';

Future<void> saveSession(String key, String value) async {
  await Keychain.setGenericPassword(key, value);
}

Future<String?> getSession(String key) async {
  return await Keychain.getGenericPassword();
}