this is the function to send an WhatsApp message (or just launch the WhatsApp with the message)

in the Cipher.dart

void sendCodeByWhatsApp(
       String phone,
      String message,
      ) async {
    String url() {
      if (Platform.isAndroid) {
        return "https://wa.me/$phone/?text=$message";
      } else {
        return "https://api.whatsapp.com/send?phone=$phone=$message";
      }
    }
    if (await canLaunchUrl(Uri.parse(url()))) {
      await launchUrl(Uri.parse(url()));
    } else {
      throw 'Could not launch ${url()}';
    }
  }

and here I use it:

 ElevatedButton(
                         child: const Icon(Icons.whatsapp, color: Colors.white,),
                         onPressed: (){
                             Cipher().sendCodeByWhatsApp(encrypt.encrypt, phone.text);
                         },
                       ),

when adding a number and message, just open a page with WhatsApp logo, tells me:

we couldn't find the page you were looking for

CodePudding user response：

Refer to this to get how to use the link properly link

There may also be an error if the number includes the country code like

1 0123456789

Will give an error. The phone should not include the country code.

CodePudding user response：

after doing some search, finally found the solution:

same code above, but the URL should be like this:

 "whatsapp://send?phone=$phone&text=${Uri.parse(message)}";

for android, and it is working like a charm...