GetX GetStorage

 import "package:flutter/material.dart";

import "package:get/get.dart";
import "package:get_storage/get_storage.dart";

void main() async {
  await GetStorage.init();  ///Initialize storage driver
  runApp(const MyApp());
}
class MyApp extends StatelessWidget {
  const MyApp({super.key}) : super();

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Flutter Demo",
      theme: ThemeData(
        primarySwatch: Colors.brown,
      ),
      home: DemoStore1(),
    );
  }
}
class DemoStore1 extends StatelessWidget {
  DemoStore1({super.key}) : super();

  var _counter = 0.obs;
  final box = GetStorage();

  void incrementCounter() {
    _counter++;
    box.write("finalCount", _counter);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Get Storage Demo"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text("You have pushed the button many times:"),
            Obx(() {
              return Text("${box.read("finalCount")}",
              style: const TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold,),);
            },),
          ],
        ),
      ),
    );
  }
}