CODEWITHSUNDEEP
androidkotlinandroid-architecture-componentsandroid-jetpackandroid-architecture-navigation
Agung
Agung

Reputation: 13803

how to make custom back button to go back to certain destination using navigation controller in Android?

I need to make a custom behaviour, when the user press the back button then the user will go to certain destination programatically. I actually have read this Handling back button in Android Navigation Component

but I don't understand how to use that custom back button code.it seems weird to me.

I have tried using this code below

override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        fragmentView = inflater.inflate(R.layout.fragment_search_setting, container, false)

        // set custom back button
        val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {

            // navigate to certain destination
            Navigation.findNavController(fragmentView).popBackStack(R.id.destination_create_event, false)


        }


        return fragmentView
    }

but I get type mismatch error like this enter image description here

Upvotes: 4

Views: 2446

Answers (1)

ahooee
ahooee

Reputation: 275

You must create new Instance of the OnBackPressedCallback abstract class and implement its abstract method .

I hope this helps you:

        val callback = requireActivity().onBackPressedDispatcher.addCallback(object : OnBackPressedCallback(true){
        override fun handleOnBackPressed() {
                        Navigation.findNavController(fragmentView).popBackStack(R.id.destination_create_event, false)
        }


    })

    // The callback can be enabled or disabled here or in the lambda

}

Upvotes: 3

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