I have a problem using GridLayout using library compatibility (not tried without). I am using app:layout_gravity=\"fill_horizontal\" instead of android:la
You have to set layout_width="0dp" and layout_gravity="fill_horizontal" for the TextView.
Please, see full example here: https://groups.google.com/d/msg/android-developers/OmH3VBwesOQ/ZOGR0SGvC3cJ or here: http://daniel-codes.blogspot.com/2012/01/gridlayout-view-clipping-issues.html