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How can i get name of Fragment android kotlin?

Instead of the headache of tracking the former fragment with passed-in arguments, you'd apply previousBackStackEntry which returns a NavBackStackEntry that is:

the previous visible entry on the back stack or null if the back stack has less than two visible entries

So, to get the id of the previous destination use: previousBackStackEntry?.destination?.id

For case, assume you've 3 fragments: fragment_a, fragment_b, and fragment_c. And at the fragment_c you need to know from which it's passed

To know the former scrap in fragment_c:

val previousFragment = findNavController().previousBackStackEntry?.destination?.id

previousFragment?.let {

    when (previousFragment) {

        R.id.fragment_a_id ->

            // The previous fragment is Fragment a

        R.id.fragment_b_id ->

            // The previous fragment is Fragment b

        else ->

            // The previous fragment is neither Fragment a nor b

    }

}