android - Restoring fragment containing dynamically created views from backstack causes IllegalArgumentException because those views are not found

Question

Within the HomeFragment I'm creating FragmentContainerViews and adding them dynamically, based on an async call, in a container then replacing them with fragment instances. Issue is when I click the GoBack arrow from another destination and return to the HomeFragment, this fragment gets restored from the backstack and causes an error because it can't find the FragmentContainerViews that I created.

I can find a workaround/hack for this but want to know what the proper way of handling this should be.

Some other observations: The HomeFrag itself is being created just once, but the fragments I add dynamically within Home are being created twice when coming back from a screen, once from the backstack (which results in error) and once from the onViewCreated of the Home fragment which creates them the same way as the first time the app was launched. "onSaveInstanceState" doesn't get called either within HomeFrag when it is pushed in the backstack.

Sample Code of HomeFragment:

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        ...
        mViewModel.getContentService().fetchHomeConfiguration(new ResponseCallback<Boolean>() {
            @Override
            public void onSuccess(Boolean showTray) {
                if (showTray) addRankedTray();
        ...
            }
            @Override
            public void onError(Throwable error) {...}
        });

    }

    private void addRankedTray() {
        FragmentContainerView fragmentContainerView = new FragmentContainerView(getContext());
        fragmentContainerView.setId("tkRankedTray".hashCode());
        binding.tkHomeContainer.addView(fragmentContainerView);

        getChildFragmentManager().beginTransaction()
                .setReorderingAllowed(true)
                .replace(fragmentContainerView.getId(), new RankedTrayFragment())
                .commit();

    }

question from:https://stackoverflow.com/questions/65852205/restoring-fragment-containing-dynamically-created-views-from-backstack-causes-il

Answer 1

Waitting for answers