如何通过特定联系人从其他应用程序打开Whatsapp？

Question

I've read how to open whatsapp from my app, as explained from the question How to open Whatsapp from other app - but it does not explain there how to open chat with a specific contact. Is there any way to open chat with specific contacts?

Answer 1

You can open whats app with specific contact but that contact must have a whats app account.

private void openWhatsApp() {
    String smsNumber = "91xxxxxxxxxx"; //without '+'
    try {
        Intent sendIntent = new Intent("android.intent.action.MAIN");
        sendIntent.setAction(Intent.ACTION_SEND);
        sendIntent.setType("text/plain");
        sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
        sendIntent.putExtra("jid", smsNumber + "@s.whatsapp.net");
        sendIntent.setPackage("com.whatsapp");
        startActivity(sendIntent);
    } catch(Exception e) {
        Toast.makeText(this, "Error\n" + e.toString(), Toast.LENGTH_SHORT).show();
    }
}

Common mistakes with above codes are

1. ACTION_SEND not ACTION_SENDTO
2. Very careful with contact number, It should have "91" or any other code based on the country.
3. Should not use any special characters like + before the number.