Android view slide in from top to bottom

Question

I want my view to perform a slide in top - slide out bottom.

What I have so far is

slide_in_top.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
               android:fromYDelta="0%p" android:toYDelta="-100%p"
               android:duration="@android:integer/config_longAnimTime"/>
</set>

slide_out_bottom.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
               android:fromYDelta="0%p" android:toYDelta="100%p"
               android:duration="@android:integer/config_longAnimTime"/>
</set>

My new view should come from top and previous view should hide from to bottom. But this is not working as expected. I cant find a proper documentation even how to work with <translate> tag. I am using ViewAnimator to animate my views. A help would be great. Thanks. And also I need a good explanation how it works like<translate android:fromYDelta android:fromXDelta> how these works with 'in animation' and 'animation out'