I'm trying to implement an app that will show in a textview all the messages received from Whatsapp. Is there any way to do it? Is it possible to extract all the messages from Whatsapp?
Whatsapp store all messages in an encrypted database (pyCrypt) which is very easy to decipher using Python.
You can fetch this database easily on Android, iPhone, Blackberry and dump it into html file. Here are complete instructions: Read, Extract WhatsApp Messages backup on Android, iPhone, Blackberry
Disclaimer: I researched and wrote this extensive guide.