How to stretch three images across the screen preserving aspect ratio?

I need to display three same size images (200 X 100) side by side (no gaps) on top of the screen. They should occupy entire width of the screen and preserve aspect ratio. Is it possible to accomplish that using only layout xml file, or I need to use java code?
Solution shoud be resolution independant... Can anybody post a solution or link for this (or similar) problem? Thanks!