SharedPreferences

shared_preferences: ^2.2.2

flutter pub add shared_preferences

shared_preferences

// SharedPreferences 인스턴스를 가져옵니다. SharedPreferences prefs = await SharedPreferences.getInstance();

// `key`에 `value`를 저장합니다. prefs.setString("key", "value");

// `key`에 저장된 값을 가져옵니다. String value = prefs.getString("key");

import 'package:flutter/material.dart'; import 'package:shared_data_app/file_app.dart'; import 'package:shared_preferences/shared_preferences.dart'; void main() { // SharedPrefences 공유 환경설정에 데이터 저장 예제 runApp(const MyApp()); // } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), useMaterial3: true, ), home: const MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { const MyHomePage({super.key, required this.title}); final String title; @override State<MyHomePage> createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { int _counter = 0; @override void initState() { super.initState(); // 공유 환경설정에 저장해놓은 데이터 가져오기 _getData(); } void _incrementCounter() { setState(() { _counter++; // + 버튼 클릭 시, 변경된 counter 값 저장 _setData(_counter); }); } // SharedPrefeces 데이터 저장하는 함수 void _setData(int value) async { var key = 'count'; SharedPreferences pref = await SharedPreferences.getInstance(); pref.setInt(key, value); } // SharedPrefeces 데이터 가져오는 함수 void _getData() async { var key = 'count'; SharedPreferences pref = await SharedPreferences.getInstance(); setState(() { var value = pref.getInt(key); _counter = value ?? 0; }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( backgroundColor: Theme.of(context).colorScheme.inversePrimary, title: Text(widget.title), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ const Text( 'You have pushed the button this many times:', ), Text( '$_counter', style: Theme.of(context).textTheme.headlineMedium, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: const Icon(Icons.add), ), ); } }

name: shared_data_app description: A new Flutter project. publish_to: none version: 1.0.0+1 environment: sdk: '>=3.2.3 <4.0.0' dependencies: flutter: sdk: flutter shared_preferences: ^2.2.2 cupertino_icons: ^1.0.2 dev_dependencies: flutter_test: sdk: flutter flutter_lints: ^2.0.0 flutter: uses-material-design: true # assets: # - images/a_dot_burr.jpeg # - images/a_dot_ham.jpeg