问使用Flutter和Dart，这是实现这一未来的最佳方式吗？

EN

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

class _MyHomePageState extends State<MyHomePage> {
  SharedPreferences _prefs;
  String _sMessage1;
  String _sMessage2;
  List<String> _lsCategories;

  @override
  void initState() {
    super.initState();
    Future<void> future = _initPreferences();
    future.then((_) {
      if (_prefs != null) {
        try {
          _lsCategories = _prefs.getStringList("categories") ?? [];
          debugPrint("Categories = $_lsCategories");
          _sMessage2 = "Categories loaded OK";
        } catch (vError) {
          _sMessage2 = ("Error loading categories = $vError");
        }
      }
      setState(() {});
    });
  }

  Future<void> _initPreferences() {
    return SharedPreferences.getInstance().then((prefs) {
      _prefs = prefs;
      _sMessage1 = "Preferences initialized OK";
    }).catchError((vError) {
      _sMessage1 = "Error initializing preferences = ${vError.toString()}";
      _sMessage2 = "Unable to load categories";
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            _createText(_sMessage1),
            SizedBox(height: 20),
            _createText(_sMessage2),
          ],
        ),
      ),
    );
  }
}

Text _createText(String sText) {
  return Text(sText == null ? "" : sText,
      style: TextStyle(
          color: Colors.red[500], fontWeight: FontWeight.bold, fontSize: 20));
}

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Future Test',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: "Flutter Future Test"),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  @override
  _MyHomePageState createState() => _MyHomePageState();
}