Facebook API: friend is writing a message?

Question

I'd like to know if there's a way, in any language, to know when a friend is writing a message through Facebook API or others.

My target is to build ssomething to be notified when a friend is writing me a message (as it works on snapchat). If there's already a way/an app to have this please tell me. Thank you!

Answer 1

朋友权限消失了，不赞成使用Chat API，因此无法使用任何语言进行操作。