Navigation Component , add or replace fragments or other things like hide show fragments

Question

how can we specify replace or add fragment in Navigation component?

NavHostFragment.findNavController(this).navigate(R.id.action_splashFragment_to_categoriesFragment)

Try this: `NavHostFragment.findNavController(this).navigate(your_fragment_id)` instead of your action ID. — Ümañg ßürmån, Nov 06 '18 at 10:36
It's done automatically, You don't have to add or replace, you just have to navigate using their Ids and instead of FrameLayout, you have NavHostFragment in your activity — Ümañg ßürmån, Nov 06 '18 at 10:42
the new fragment add, and when back button clicked previews fragment load(new instance of first fragment load - reiniialize) — Mohad Hadi, Nov 06 '18 at 11:51
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/183184/discussion-between-mohammad-hadi-and-umang-ssurman). — Mohad Hadi, Nov 06 '18 at 11:51
The navigation component using replace method, you cannot change it. — Alex, Nov 29 '18 at 14:56
@charisharma you can't do that currently navigation component using replace method. — mochadwi, Aug 29 '19 at 07:20

score 2 · Answer 1 · answered Mar 24 '20 at 11:00

If you just use findNavController().navigate(R.id.someDestinationId) this kind of equals to fragmentManager.add but if you want the replace behavior and you don't want the user be able to press back and reload the previous activity you should do like this:

findNavController().navigate(R.id.homeFragment, null, NavOptions.Builder()
                .setPopUpTo(R.id.loginFragment, true)
                .build())

In this case I'm inside LoginFragment and I want to navigate to HomeFragment and I also would like to replace current fragment so the user won't be able to press back and load the LoginFragment again

May I know the source of this answer?? as I want to explore a bit more on it — Rahul, Apr 24 '20 at 12:26

score 2 · Answer 2 · answered Jul 10 '20 at 16:20

Jetpack Navigation Component supports replacing fragments as of now.

There is no support for adding fragments.

Workaround to retain api data in fragment when back button is pressed is to either save the data (Fragment viewstate) in a ViewModel and make a check in onViewCreated() or to use Full Screen DialogFragments. For dialog fragment check this https://gist.github.com/utkukutlu/bd2e37253e7184179d923321e3ea72c1

Navigation Component , add or replace fragments or other things like hide show fragments

2 Answers2