getReturnTransition
Returns the Transition that will be used to move Views out of the scene when the Fragment is preparing to be removed, hidden, or detached because of popping the back stack. The exiting Views will be those that are regular Views or ViewGroups that have isTransitionGroup return true. Typical Transitions will extend android.transition.Visibility as entering is governed by changing visibility from VISIBLE to INVISIBLE. If nothing is set, the default will be to use the same transition as getEnterTransition.
Return
the Transition to use to move Views out of the Scene when the Fragment is preparing to close due to popping the back stack.