What is the trick with 0dip layout_height or layouth_width?

Question

I mean why anybody want they view to be 0dip height ? I have seen this many times, there must be some kind of trick, but I do not get it.

Answer 1

This is usually used when having many views inside a linearlayout and have set android:layout_weight="1" in order both views to take equal space. for example:

In that case, the view will take as much height as all other views.