shared preferences

shared_pref.dart

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      home: QuranScreen(),
    ),
  );
}

class QuranScreen extends StatelessWidget {
  const QuranScreen({Key? key}) : super(key: key);

  void saveData() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    await preferences.setString("name", "Omar");
    await preferences.setString("Ui color", "Blue");
    await preferences.setBool("Dark Theme", false);
    await preferences.setInt("undo count", 30);

    var name = preferences.getString("name");
    print(name);

    var username = preferences.getString("username") ?? "not found";
    print(username);

    // remove with key
    preferences.remove("name");

    // // clear all preferences
    // preferences.clear();
  }

  void saveLogged() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    preferences.setBool("loggedIn", true);
  }

  void checkLogged() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    var loggedIn = preferences.getBool("loggedIn") ?? false;
    print(loggedIn);
  }

  void logOut() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    preferences.clear();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          ElevatedButton(onPressed: saveData, child: Text("Save data")),
          ElevatedButton(onPressed: saveLogged, child: Text("save logged")),
          ElevatedButton(onPressed: checkLogged, child: Text("check logged")),
          ElevatedButton(onPressed: logOut, child: Text("logOut")),
        ],
      ),
    );
  }
}