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

final Uri _url = Uri.parse('https://7Span.com');

void main() => runApp(
      const MaterialApp(
        home: Material(
          child: Center(
            child: ElevatedButton(
              onPressed: _launchUrl,
              child: Text('Show 7Span homepage'),
            ),
          ),
        ),
      ),
    );

Future<void> _launchUrl() async {
  if (!await launchUrl(_url)) {
    throw Exception('Could not launch $_url');
  }
}