【FLUTTER ANDROID STUDIO and IOS】textfield

	import 'package:flutter/material.dart';
	void main() => runApp(MyApp());
	class MyApp extends StatelessWidget {
	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	title: 'Flutter Demo',
	theme: ThemeData(
	primarySwatch: Colors.red,
	),
	home: MyHomePage(title: 'Epic Page'),
	);
	}
	}
	class MyHomePage extends StatefulWidget {
	MyHomePage({Key key, this.title}) : super(key: key);
	final String title;
	@override
	_MyHomePageState createState() => _MyHomePageState();
	}
	class _MyHomePageState extends State<MyHomePage> {
	String txt = "";
	@override
	Widget build(BuildContext context) {
	return Scaffold(
	appBar: AppBar(
	title: Text(widget.title),
	),
	body: Center(
	child: Column(
	children: [
	Text("$txt"),
	TextField(
	onChanged: (String str) {
	print(str);
	setState(() {
	txt = str;
	});
	},
	),
	],
	)
	),
	);
	}
	}

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