How can I pass data to the previous fragment using Android Navigation?

Question

My app starts with NewAdFragment and inside this fragment, There is a button that allows user to choose the category, When the user clicks on the button I'll navigate him to ChooserFragment with passing categories list as an argument, There is RecyclerView inside this fragment and it shows categories.

What do I want? I want when the user chooses an item from RecyclerView, Then it must back to NewAdFragment with specific data.

I can solve this problem in a lot of ways but maybe there is a method that exists in the navigation component library already.

What is the best way to do that?

use argument in navigation i hope this will help – Hamza Javed Mar 21 '22 at 08:47 — Hamza Javed, Mar 21 '22 at 08:47

score 6 · Accepted Answer · answered Mar 21 '22 at 08:48

6

try to implement below code blocks as mentioned here:

FRAGMENT A

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val navController = findNavController();
// We use a String here, but any type that can be put in a Bundle is supported
navController.currentBackStackEntry?.savedStateHandle?.getLiveData<String>("key")?.observe(
    viewLifecycleOwner) { result ->
    // Do something with the result.
  }
}

FRAGMENT B

navController.previousBackStackEntry?.savedStateHandle?.set("key", result)
navController.popBackStack()

you can also check this

answered Mar 21 '22 at 08:48

aligur

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Is it required to use LiveData with it? – Taha Sami Mar 21 '22 at 08:54
@SC291 yes. you must use live data. – aligur Mar 21 '22 at 13:47

How can I pass data to the previous fragment using Android Navigation?

1 Answers1