插件地址：https://github.com/flutter/plugins/tree/master/packages/url_launcher
推荐使用的url插件，很方便，还可以一键打开发送邮箱的界面，还有拨打电话界面，发送短信等。
Scheme
Action
http:<URL> , https:<URL>, e.g. http://flutter.io
Open URL in the default browser
mailto:<email address>?subject=<subject>&body=<body>, e.g. mailto:smith@example.org?subject=News&body=New%20plugin
Create email to in the default email app
tel:<phone number>, e.g. tel:+1 555 010 999
Make a phone call to using the default phone app
sms:<phone number>, e.g. sms:5550101234
Send an SMS message to using the default messaging app
如果想拨打电话界面就直接写个：
url = 'tel:+1 555 010 999';//+1 555 010 999是电话号码， // 记得一定要加冒号:，不然出错
import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';
void main() {
runApp(Scaffold(
body: Center(
child: RaisedButton(
onPressed: _launchURL,
child: Text('Show Flutter homepage'),
),
),
));
}
_launchURL() async {
const url = 'https://flutter.io';
if (await canLaunch(url)) {
await launch(url);
} else {
throw 'Could not launch $url';
}
}
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