플러터 main.dart 간단 코드

기본 자동 생성된 main.dart

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({superkey});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatuefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorSchme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAligment.center,
          children: <Widget>[
            const Text('You have pushed the button this main times:'),
            Text('$_counter', style: Theme.of(context).textTheme.headlineMedium,)
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

샘플 코드 1

- main.dart

void main() {
  runApp(
      MaterialApp(
        home: Scaffold(
          body: Text(
            'Hello World',
          ),
        ),
      )
  );
}

 

샘플 코드 2

- main.dart

// import 'package:프로젝트이름/lib폴더 하위 폴더명/파일명.dart'
import package:AAA/screen/home_screen.dart';

void main() {
  runApp(
    MaterialApp(
      home: HomeScreen(),
    )
  );
}

- home_screen.dart

import 'package:flutter/material.dart';

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Text('Home Screen'),
    );
  }
}

샘프로 코드 3

- main.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomeMain(),
    );
  }
}