Nested fragments disappear during transition animation

Question

Here\'s the scenario: Activity contains fragment A, which in turn uses getChildFragmentManager() to add fragments A1 and A2

Answer 1

My problem was on parent fragment removal (ft.remove(fragment)), child animations were not happening.

The basic problem is that child fragments are immediately DESTROYED PRIOR to the parents fragment exiting animation.

Child fragments custom animations do not get executed on Parent Fragment removal

As others have eluded to, hiding the PARENT (and not the child) prior to PARENT removal is the way to go.

            val ft = fragmentManager?.beginTransaction()
            ft?.setCustomAnimations(R.anim.enter_from_right,
                    R.anim.exit_to_right)
            if (parentFragment.isHidden()) {
                ft?.show(vehicleModule)
            } else {
                ft?.hide(vehicleModule)
            }
            ft?.commit()

If you actually want to remove the parent you should probably set up a listener on you custom animation to know when the animation is ended, so then you can safely do some finalisation on the Parent Fragment (remove). If you don't do this, in a timely fashion, you could end up killing the animation. N.B animation is done on asynchronous queue of its own.

BTW you don't need custom animations on the child fragment, as they will inherit the parent animations.