title: Implement in iOS - Android MultiAutoCompleteTextView with custom tokenizer as in Whatsapp [image attached]
body: <p>I want to create custom tokenizer for <strong>@</strong> as in WhatsApp feature when you open group and type <strong>@</strong> then there is a popup displaying list of friends and you select one from the list.</p>
  
  <p>I want to show something like this:</p>
  
  <p><a href="https://i.stack.imgur.com/q0J03.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/q0J03.png" alt="enter image description here"></a></p>