Android: Where to put functions that multiple fragments share

Question

I have three fragments and all of them have two functions which are EXACTLY THE SAME. My problem is that I (obviously) don't want to copy the same two functions over and over again and put it in the fragments.

Ain't there a way to put these functions in one place and call them from my fragments? These functions have to do with navController and Toolbar Navigation so I cant put it in my viewmodel. Another solution could be to create a Baseclass fragment, put these functions in there and inherit from it?

Functions

private fun initProgressbar(currentStateNumber: StateProgressBar.StateNumber, progressBarDescription: ArrayList<String>) =
    state_progress_bar.apply {
        setStateDescriptionData(progressBarDescription)
        setCurrentStateNumber(currentStateNumber)
    }

private fun initToolbar(navController: NavController, appBarConf: AppBarConfiguration, textToolbar: String?) =
    toolbar.apply {
        setupWithNavController(navController, appBarConf)
        toolbar_title.text = textToolbar
    }

I didn't found any solution without violating the mvvm architecture or the lifecyle of the fragments. I am using jetpack navigation, mvvm and dagger hilt.

I appreciate every help.

EDIT: Possible Solution

abstract class BaseFragment(
    layout: Int,
    private val progressBarDescription: ArrayList<String>,
    private val stateNumber: StateProgressBar.StateNumber
) : Fragment(layout) {

    private val _navController: NavController by lazy { findNavController() }
    private val appBarConf by lazy { AppBarConfiguration(_navController.graph) }
    private val calibrateRepairToolbarText by lazy { arguments?.getString("calibrate_repair_toolbar_text") }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        initProgressbar()
        initToolbar()
    }

    val navController: NavController
        get() = _navController

    fun initProgressbar(): StateProgressBar = state_progress_bar.apply {
            setStateDescriptionData(progressBarDescription)
            setCurrentStateNumber(stateNumber)
        }

    fun initToolbar(): MaterialToolbar = toolbar.apply {
            setupWithNavController(_navController, appBarConf)
            toolbar_title.text = calibrateRepairToolbarText
        }
}

And then in the other Fragment:

class Fragment(
    private val progressBarDescription: ArrayList<String>,
    @StateNumberOne private val stateNumber: StateProgressBar.StateNumber
) : BaseFragment(
    R.layout.fragment_calibrate_repair_message,
    progressBarDescription,
    stateNumber
) {
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
    }

}

Answer 1

You can create a baseFragment, with these methods, and then have your three Fragments extend baseFragment