android bottom navigation hiding views

1private fun setupNav() {
2    val navController = findNavController(R.id.nav_host_fragment)
3    findViewById<BottomNavigationView>(R.id.bottomNav)
4        .setupWithNavController(navController)
5
6    navController.addOnDestinationChangedListener { _, destination, _ ->
7        when (destination.id) {
8            R.id.mainFragment -> showBottomNav()
9            R.id.mineFragment -> showBottomNav()
10            else -> hideBottomNav()
11        }
12    }
13}
14
15private fun showBottomNav() {
16    bottomNav.visibility = View.VISIBLE
17
18}
19
20private fun hideBottomNav() {
21    bottomNav.visibility = View.GONE
22
23}