【Flutter】URLを開く方法

	// url_launcher のインストール必要
	// Link: https://pub.dartlang.org/packages/url_launcher
	import 'package:flutter/material.dart';
	import 'package:url_launcher/url_launcher.dart'; // 追加
	// void main {...}
	// class MyApp extends StatelessWidget {...}
	class _MyHomePageState extends State<MyHomePage> {
	@override
	Widget build(BuildContext context) {
	return Scaffold(
	floatingActionButton: FloatingActionButton(
	onPressed: _launchURL,　// ボタンが押されたとき
	child: Icon(Icons.launch),
	),
	);
	}
	}
	_launchURL() async {
	const url = 'https://flutter.io';
	if (await canLaunch(url)) {
	await launch(url);
	} else {
	throw 'Could not launch $url';
	}
	}

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参考

url_launcher