Android view slide in from top to bottom

Question

I am able to give bottom to top animation when I go to next activity but now when I pressed back I am using same code for giving animation from top to bottom animation but it always goes to bottom to top so my question is how to give animation from top to bottom when i pressed back button on android device?
Please find my code below.

I use it during transitioning from one Activity to another using an Intent.

overridePendingTransition( R.anim.slide_in_up, R.anim.slide_out_up );

and xml is: slide_in_up.xml

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromYDelta="100%p" android:toYDelta="0%p"
android:duration="@android:integer/config_longAnimTime"/>

and slide_out_up.xml is

 <?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromYDelta="0%p" android:toYDelta="-100%p"
android:duration="@android:integer/config_longAnimTime"/>