How to send a message directly from my Flutter app to WhatsApp using UrlLauncher?

Question

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.

 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");
            },

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.

Answer 1

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');
}