Send text to specific contact in Watsapp Android

Simple way to send message to specific contact from your app to watsapp

Uri uri = Uri.parse("smsto: <CONTACT_NUMBER>");
Intent i = new Intent(Intent.ACTION_SENDTO, uri);
/* i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); */
i.putExtra("sms_body", "Cool!!");
i.setPackage("com.whatsapp");
startActivity(i);