Manage Fragement - Backspace

//Below code work in first fragement and if you press backspace in any fragement it detect in first fragement only in viewpager2

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    try {
        // This callback will only be called when MyFragment is at least Started.
        requireActivity().onBackPressedDispatcher.addCallback(this) {
                // Handle the back button event
                if (noteEditMode ) {
                    if(isPopupMenuBarVisible)
                    {
                        showPopupMenu(false) //hide popupMenubar
                    }else {
                        listNoteDocuments()
                        if (etBook.text.trim().isEmpty()) {deleteFile(actualFileName, "")} //If note is empty then delete this note.
                    }
             } else if(mViewPager.currentItem == 0 || mViewPager.currentItem == 4) {
                //} else{
                    mViewPager.currentItem = 5
                }
            }
    } catch (e: Exception) {
        Toast.makeText(activity,e.message.toString(), Toast.LENGTH_SHORT).show()
    }

    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.f_notepadmode_book, container, false)
}

//Below code detect backspace in any fragement it works fine.

private lateinit var etBook: EditText
private lateinit var etControlBackButton: EditText

//Below onResume executed when this fragment is disBooked to the user.
override fun onResume() {
    super.onResume()
    showPopupMenu(false)
    etControlBackButton.showSoftInputOnFocus = false
    etControlBackButton.requestFocus() //To Manage Back button
    hideKeyboard()
}

@SuppressLint("ResourceAsColor")
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
etBook = view.findViewById(R.id.etBook)
etControlBackButton= view.findViewById(R.id.etControlBackButton)
//To Manage Back button
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){etControlBackButton.showSoftInputOnFocus = false} //It will allow cursor to focus but keyboard not open.
etControlBackButton.setOnKeyListener{ _, keyCode, event ->
    if (event.action === KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {
        if(popupMenuBar.visibility == LinearLayout.VISIBLE) {showPopupMenu(false)} else{mViewPager.currentItem = 5}}
    false
}
etBook.setOnKeyListener{ _, keyCode, event ->
    if (event.action === KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {
        if(popupMenuBar.visibility == LinearLayout.VISIBLE) {showPopupMenu(false)} else{mViewPager.currentItem = 5}}
    false
}