Flutter 簡易起手式

起始專案

import 'package:flutter/material.dart';

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

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

class _mainbody extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: RaisedButton(
        child: Text("Hello Button"),
        onPressed: () {
          // ...do something...
          // ...
          // ...go to page2...
          //Navigator.push(context,
          //  MaterialPageRoute<void>(builder:(BuildContext context) {
          //    return page2() ;
          //})
        },
      ),
    );
  }
}

 StatelessWidget

import 'package:flutter/material.dart';

class page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: _page2()
    );
  }
}

class _page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body:Center(
          child: RaisedButton(
              child: Text("Home"),
              onPressed: () {
                // ...do someting...
                // ...
                // ...return homepage...
                //Navigator.pop(context);
              }),
        ),
    );
  }
}