I found some Android RTMP libraries (like this : http://rtmpdump.mplayerhq.hu/).
The problem is that there is no accurate documentation on how we can use it.
Not sure if this helps, but... I was able to do something similar (rtmp - streaming video) using Flash, so you need Android 2.2+ for this.
Anyway, I just wrote an HTML page displaying the flash video then opened the page in a WebView.
YOUR TITLE HERE! Please Install Adobe Flash Player