background images cross fading - android

I have an application which have multiple backgrounds. I would like to cross-fade these backgrounds at a fixed time interval having one background fading out while slowly showing another (kind of like a slideshow). I know how to use the cross-fading effect in xml but the problem is it won't show another image until the active image is totally fading out. I want the transitions to overlap. Please help.
Thanks.

Have a look at this tutorial: http://www.pushing-pixels.org/2011/03/07/android-bits-and-pieces-image-cross-fading.html

see the below link,which solved my problem(cross-fade effect when changing backgrounds of a view):
Crossfading using TransitionDrawable not working on android

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