搭建flutter框架模版常用

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import 'package:flutter/material.dart';   void main() => runApp(MyApp());   class MyApp extends StatelessWidget {   @override   Widget build(BuildContext context) {     return Center(       child: Text(         'Hello, world!',         textDirection: TextDirection.ltr,         textAlign: TextAlign.center,         overflow: TextOverflow.ellipsis,         style: TextStyle(fontWeight: FontWeight.bold),       ),     );   } }