Android Question Detecting events like 'message arrival' etc. in WhatsApp application - reg.

Hi,

I wish to write a routine which will do the following:

i) Detect when a Whatsapp message arrives in my mobile.
ii) If the message is from a particular mobile number move it to a particular
folder in my mobile , both the message and the related audio or video or any attachment that was sent by that mobile number.
iii) If I reply to that message, a copy of the reply that I have given with attachment(audio, video) will also go to another email-id.

Ps. help.

Thanks