如何正确调试我的Flutter应用程序

Question

我写了这些代码行，Visual Studio和dartpad.dev/flutter中没有错误，但是在这两个代码中我都无法调试，我不知道为什么。有人可以帮我吗...这是代码

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


void main(List<String> args) {   MaterialApp(
    title: 'zinwar',
    home:MyApp() ,   ); }


class MyApp extends StatefulWidget{   
@override   State<StatefulWidget> createState() {
    return MyAppState() ;   }

}

class MyAppState extends State<MyApp> {   
@override   Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        backgroundColor: Colors.blue,
        actions: <Widget>[],
        leading: IconButton(
           onPressed: () {  },
          icon: Icon(Icons.arrow_back), 

      ),

      ),
      body: Center(
        child: Text('HELLO I AM ZINWARM NICE TO MEET YOU'),
      ),
    );   }




}