getReenterTransition
Returns the Transition that will be used to move Views in to the scene when returning due to popping a back stack. The entering Views will be those that are regular Views or ViewGroups that have isTransitionGroup return true. Typical Transitions will extend android.transition.Visibility as exiting is governed by changing visibility from VISIBLE to INVISIBLE. If nothing is set, the default will be to use the same transition as getExitTransition.
Return
the Transition to use to move Views into the scene when reentering from a previously-started Activity due to popping the back stack.