Get fragment from NavController

Question

I have one NavController (navOrdersController) with 2 fragments inside. My current fragment is OrderDetailFragment and I want access to first Fragment (OrdersFragment) to update data in MainActivity. How can I do this?

I tried findFragmentByTag and findFragmentByID but always return null.

I got access OrderDetailFragment with:

this.supportFragmentManager.fragments[position].findNavController().currentDestination

But I need previous fragment. Thank you very much

Solution

Can't say the code snippet (I've added below) is the best solution, but it worked for me to get the recent/current fragment added in NavHostFragment used in Android Navigation Component's implementations

OR

You can even override onActivityResult of the you activity with your fragment's, all you need is to get the added Fragment and call it's onActivityResult, using this code snippet:

    NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);
    Fragment fragment = navHostFragment.getChildFragmentManager().getFragments().get(0);
    fragment.onActivityResult(requestCode, resultCode, data);

Comments

[Patrick]

Thanks Rahul. It doesn't work because parent is an NavGraph, and child is OrderDetailFragment. OrdersFragment is in the middle

[Rahul Sharma]

NavGraph should not be a parent. Because the parent can be Activity or Fragment. I am not sure though. Give me a few minutes to check.

[Patrick]

It doesn´t work. "null cannot be cast to non-null type android.navigation.fragment.NavHostFragment" because parent is null. I updated my question. I have to work with navController

[Rahul Sharma]

here zero is the backstack index (which should have been in case you were implementing the graph yourself)

[Patrick]

Thanks Rahul but still not working, parent is null. Fragments are inside NavController