title: Making a WhatsApp voice/video call
body: <p>I'm trying to find out how I can make a whatsapp call (both video and voice) straight from the app. I read this post: <a href="https://stackoverflow.com/questions/38655458/android-make-whatsapp-call">android-make whatsapp call</a> but I don't understand it. I want the user to be able to select a contact from their contact list and then they are brought to a screen with two buttons: Video Call and Voice Call. The contact's phone number will also be shown as a textview on top. They can click either one of the buttons and the app will make a whatsapp call. I'm not sure how I can get a specific contact's id and call that. </p>
  
  <p>If anyone could explain it in another way, I'd be very grateful.</p>
  
  <p>Thanks</p>