How to implement a feature in the chat?

Question

Android

I'm working on a social application (no, I don't want to become the second Durov, the implementation is purely interesting) and the question arose: how to make the "User is typing a message" feature in the chat window? Do I need to put some kind of listener on the text field? Or write the state somewhere? Or some other method.

Answer 1

You can look at the example of VK :
1. When the user starts typing something, a status change request is sent. Yes, it needs a listener.
2. The server temporarily (10 seconds) stores information that the user is typing a message.
3. If text input continues after 5 seconds or more, a second request is sent to extend the status for another 10 seconds.