Making Android chat application from scratch

Question

I need to make chat application for android. I thought of using PHP script to implement the chat application. Basic idea is to send message form android client to PHP script and

Answer 1

You'd probably want to use Google's C2DM, though it's not free.

Your php server would get a message from a phone, do it's processing, then make a HTTPS request to Google's C2DM service, which sends the messages to the destination android device.

http://code.google.com/android/c2dm/#push-process