Not allowing horizontal spacing between grid view items,

I am using following for grid view , I don't want horizontal space between grid view item.
android:horizontalSpacing="0px"
android:verticalSpacing="0px"

by using this there no vertical space between item. But the horizontal space remain there, how to
eliminate this horizontal space between grid items.

will anybody suggest.

have the buttons set fill_parent or give them all gravity 1

thank you for reply,
actually all these are images, I am referring GridView API demo,
I tried for both fill_parent and wrap_content, then too it is not working., and also android:layout_weight="1"
is there any solution to this problem. if so plz reply me.