Use the plugin.
> url_launcher


Using the following link : https://api.whatsapp.com/send?phone=XXXXXXXXXXX (In place of the Xs type the phone number of the person you want to contact, including the country code, but without the + sign.)

RaisedButton( onPressed: () async => await launch( "https://wa.me/${number}?text=Hello"),, child: Text('Open Whatsapp'), ),
**Alternatively**
You can use this other plugin.
> whatsapp_unilink
The whatsapp_unilink package helps you build HTTP links and provides you with an idiomatic Dart interface that:


import 'package:whatsapp_unilink/whatsapp_unilink.dart'; import 'package:url_launcher/url_launcher.dart'; launchWhatsApp() async { final link = WhatsAppUnilink( phoneNumber: '+001-(555)1234567', text: "Hey! I'm inquiring about the apartment listing", ); await launch('$link'); }

Use the plugin.
> [url_launcher][1]
Using the following link : https://api.whatsapp.com/send?phone=XXXXXXXXXXX (In place of the Xs type the phone number of the person you want to contact, including the country code, but without the + sign.)

> RaisedButton( > onPressed: () async => await launch( > "https://wa.me/${number}?text=Hello"),, > child: Text('Open Whatsapp'), > ),
**Alternatively**
You can use this other plugin.
> [whatsapp_unilink][2]
The whatsapp_unilink package helps you build HTTP links and provides you with an idiomatic Dart interface that:
> import 'package:whatsapp_unilink/whatsapp_unilink.dart'; > import 'package:url_launcher/url_launcher.dart'; > > launchWhatsApp() async { > final link = WhatsAppUnilink( > phoneNumber: '+001-(555)1234567', > text: "Hey! I'm inquiring about the apartment listing", > ); > await launch('$link'); > }

[1]: https://pub.dev/packages/url_launcher [2]: https://pub.dev/packages/whatsapp_unilink