I don't think it is possible to make the gap between the rows animate though I put slide left/right animation on the view that I show as the child. This only really works because there is only a single child.
Hope it will will helpfull for you just go through this.. mylifewithandroid.blogspot.com/2010/02/e....
It can be done using a simple ListView that contains an initially hidden view and a custom class that extends Animation. The basic idea is to start with View. GONE then gradually re-size the margin from a negative value to the required size while setting visibility to View.VISIBLE.
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