I thought the system would reverse animations on the backstack when the back button is pressed when using fragments using the following code:
FragmentManager
in my case
fragmentTransaction.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_out_right, R.anim.slide_in_right, R.anim.slide_out_left);
would create perfect animation.
slide_in_right
slide_out_left