_launchURL gets launched when my widget gets build

Question

I'm using the url_launcher package to launch urls in my app.

I have many links that I need to launch with separate buttons.

However when I load my stateless widget it launches the "_launchURL" function and opens up https://www.yahoo.com immediately.

I believe this have something todo with the widget being called when it gets created. But the function inside "onPressed" should not be called before an actual press, right?

class myStateless extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ListView(
        children: <Widget>[
            button("Link 1", "https://www.yahoo.com"),
            button("Link 2", "https://www.google.com"),
        ]
    );
  }
}

Widget button(String text, String url) {
    return RaisedButton(
        child: Text(text),
        onPressed: _launchURL(url),
      );
}

_launchURL(url) async {
  if (await canLaunch(url)) {
    await launch(url);
  } else {
    throw 'Could not launch $url';
  }
}

I then get the error: type 'Future<dynamic>' is not a subtype of type 'String'

iPatel iPatel · Accepted Answer · 2019-06-28T12:12:42

Ok, You have to just change at your button() creation method like,

onPressed: _launchURL(url) TO onPressed: () => _launchURL(url),

That's it.

_launchURL gets launched when my widget gets build

2 Answers