Hi! I wrote this extension to be able to handle ba...

# android

[iex]

Hi! I wrote this extension to be able to handle back button event in fragments:

fun Fragment.onBack(consume: Boolean = false, callback: () -> Unit) {
    activity?.onBackPressedDispatcher?.addCallback {
        callback()
        if (!consume) {
            findNavController().navigateUp()
        }
    }
}

Works perfectly when I don't want to consume the event. It also works when I consume it, except that after it the back button is dead. How do I consume only the current back press?

[Adam Powell]

what's a, "current" back press? 🙂 You've added a callback, it will continue to listen for events until you remove it

[Adam Powell]

You can use the overload of addCallback that accepts a LifecycleOwner to manage the callback automatically for you

[iex]

okay, yeah I looked for methods to remove the callback but there aren't any

[iex]

will try with the lifecycleowner version

[Adam Powell]

the callback object itself has a .remove() method

[Adam Powell]

you're losing the reference to it by calling the SAM-converted version of addCallback

[iex]

ah okay, will try that out when I'm back to this task 👍

[iex]

thanks!

[iex]

confirm that by using the LifecycleOwner the issues are fixed. It's weird, since I remember having tried this out but probably I was doing something else wrong then.