Will Eclipse and android SDK run on windows tablet?or is there any other device as portable as a tablet that it can run on(like sony vaio p and sony vaio ux)?
AIDE lets you develop for Android, on Android. It runs well on most Android Tablets.
Eclipse wont run on Windows RT till it is ported, but Windows 8 on Tablets can run eclipse (and anything that runs on Windows 7) easily. So you could either go the Android way, or wait for the Surface running Windows 8.