java - How can I send message to specific contact through WhatsApp from my android app?

Question

I am developing an android app and I need to send a message to specific contact from WhatsApp. I tried this code:

Uri mUri = Uri.parse("smsto:+999999999");
Intent mIntent = new Intent(Intent.ACTION_SENDTO, mUri);
mIntent.setPackage("com.whatsapp");
mIntent.putExtra("sms_body", "The text goes here");
mIntent.putExtra("chat",true);
startActivity(mIntent);

The problem is that the parameter "sms_body" is not received on WhatsApp, though the contact is selected.

Answer 1

There is a way. Make sure that the contact you are providing must be passed as a string in intent without the prefix "+". Country code should be appended as a prefix to the phone number .

e.g.: '+918547264285' should be passed as '918547264285' . Here '91' in beginning is country code .

Note :Replace the 'YOUR_PHONE_NUMBER' with contact to which you want to send the message.

Here is the snippet :

 Intent sendIntent = new Intent("android.intent.action.MAIN");
 sendIntent.setComponent(new  ComponentName("com.whatsapp","com.whatsapp.Conversation"));
 sendIntent.putExtra("jid", PhoneNumberUtils.stripSeparators("YOUR_PHONE_NUMBER")+"@s.whatsapp.net");
 startActivity(sendIntent);

Update:

The aforementioned hack cannot be used to add any particular message, so here is the new approach. Pass the user mobile in international format here without any brackets, dashes or plus sign. Example: If the user is of India and his mobile number is 94xxxxxxxx , then international format will be 9194xxxxxxxx. Don't miss appending country code as a prefix in mobile number.

  private fun sendMsg(mobile: String, msg: String){
    try {
        val packageManager = requireContext().packageManager
        val i = Intent(Intent.ACTION_VIEW)
        val url =
            "https://wa.me/$mobile" + "?text=" + URLEncoder.encode(msg, "utf-8")
        i.setPackage("com.whatsapp")
        i.data = Uri.parse(url)
        if (i.resolveActivity(packageManager) != null) {
            requireContext().startActivity(i)
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
}

Note: This approach works only with contacts added in user's Whatsapp account.