尝试使用Flutter在主页上显示用户名

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^2.0.6

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

String username = '';

@override
void initState() {
  super.initState();
  getUsername();
}

void getUsername() async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  setState(() {
    username = prefs.getString('username') ?? '';
  });
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text('Home'),
    ),
    body: Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Text(
            'Welcome,',
            style: TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
          Text(
            username,
            style: TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
        ],
      ),
    ),
  );
}

void saveUsername(String name) async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  await prefs.setString('username', name);
}