How can I write a single function that can be re-used by multiple fragments to navigate to a singular destination?

Question

Let's say I have 4 fragments and navigate through them in the order A -> B -> C -> D using a NavController object.

A is my home screen.

I'd like to write a single function called goToA() that can be inherited and called from either B, C or D which navigates to A and clears up the back stack

How do I go about that?

You could create a Global Action (https://developer.android.com/guide/navigation/navigation-global-action) that uses `popUpTo` to navigate to `A` and pop everything but that off the back stack (https://developer.android.com/guide/navigation/navigation-navigate#pop) — cactustictacs, Jun 14 '22 at 17:00

score 0 · Answer 1 · answered Jun 14 '22 at 13:06

0

In your BaseFragment just create the function:

protected fun goToA() {
    findNavController().popBackStack(R.id.<id of fragment A in the nav graph here>, false)
}

Now you can call this function from either B, C or D

answered Jun 14 '22 at 13:06

Nongthonbam Tonthoi

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FWIW, just an opinion. https://levelup.gitconnected.com/android-nightmares-base-classes-ccf55dbd0604 https://proandroiddev.com/say-no-to-baseactivity-and-basefragment-83b156ed8998 – Tenfour04 Jun 14 '22 at 13:13

score 0 · Answer 2 · answered Jun 14 '22 at 13:11

0

You can write an extension function for it, defined at the top level outside any classes, that you can call from any of your Fragments:

fun Fragment.goToA() {
    //...
}

answered Jun 14 '22 at 13:11

Tenfour04

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How can I write a single function that can be re-used by multiple fragments to navigate to a singular destination?

2 Answers2