title: How to send a message directly from my Flutter app to WhatsApp using UrlLauncher?
body: <p>I am building an app that has to be able to take an order and send it to a specific WhatsApp number. What exactly am I supposed to do? I can open WhatsApp but I can't figure out how to send a message when opening it.</p>
  
  <pre><code> title: new Text("WhatsApp"),
              trailing: new Icon(Icons.message),
               onTap: () async {
                int phone = 962770593839;
                var whatsappUrl = "whatsapp://send?phone=$phone";
                await UrlLauncher.canLaunch(whatsappUrl) != null
                    ? UrlLauncher.launch(whatsappUrl)
                    : print(
                        "open WhatsApp app link or do a snackbar with 
  notification that there is no WhatsApp installed");
              },
  </code></pre>
  
  <p>I expect that when I input a TextField and press send that saved String will be able to be sent to the WhatsApp number after launching WhatsApp.</p>