Navigation component: shared transitions backward not works

Component used: Navigation Version used: 1.0.0-alpha06 Devices/Android versions reproduced on: All

Fragment one: RecyclerView (GridLayoutManager). Transition name to ImageView is assigned in Adapter from model’s name (unique) Fragment two: Detail Fragment with ImageView and some text data. Transition name retrieved from argument’s bundle.

Forward shared transition works excellent, but when I press “back” button there is no transition at all. In NavHostActivity: override fun onSupportNavigateUp() = findNavController(R.id.nav_host_fragment).navigateUp()

In old paradigm

fragmentManager
            .beginTransaction()
            .addSharedElement(sharedImageView, transitionName)

all worked fine.

[wrabot]

I think I found the reason with debugging. navigate will create a transaction with

setReorderingAllowed(true)

This seems to cause the issue

I found a workaround In calling fragment, add the following in onViewCreated (or at the end of onCreateView)

postponeEnterTransition()
view.doOnPreDraw { startPostponedEnterTransition() }

[caitlynoleykowski]

The GithubBrowserSample contains a shared element transition between an ImageView and another ImageView. When trying to do this between two different element types (such as a list element and the entire detail view, like in gmail when selecting on an email), the return transition does not seem to work. Are there any examples that use shared element transition with navigation component between a list and the list detail view?