[android-developers] Fragment animation

Hi all. I'm having difficulty getting to grips with the
'objectAnimator' element which is used for fragment animation, and
searching around hasn't really offered much clues.

Here's what I'm trying to achieve:

I have a simple layout where two fragments occupy a portion of the
screen each, added vertically to a LinearLayout. So the top half of
the screen could be FragmentA, and the bottom half FragmentB. Upon
some event, I hide the top fragment, so that FragmentB takes up the
whole screen, and then upon another event, FragmentA is shown again.

When FragA is hidden, I want FragB to gracefully slide up to take its
place, and similarly when FragA is shown again, I want it to slide
back into place pushing FragB back down.

Would really appreciate some help with the objectAnimator properties.

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