Main Activity Kt

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private val binding by viewBinding(ActivityMainBinding::inflate)
    lateinit var navController: NavController
    override fun onCreate(savedInstanceState: Bundle?) {

        setTheme(R.style.Theme_SnapchatClone)
        super.onCreate(savedInstanceState)
        transparentStatusBar()
        setContentView(binding.root)
        initViews()

    }

    private fun initViews(){
        setUpBottomNavigation()
    }

    private fun setUpBottomNavigation(){
      
        val navHost = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        navController = navHost.navController
        binding.bottomNavigation.setupWithNavController(navController)
        binding.bottomNavigation.setOnItemReselectedListener {
            //do something when selected twice
        }
        binding.bottomNavigation.setOnItemSelectedListener { item ->
            NavigationUI.onNavDestinationSelected(
                item,
                Navigation.findNavController(this, R.id.nav_host_fragment)
            )
        }

        binding.bottomNavigation.itemIconTintList = null

        //if we are viewing stories, hide the bottom navigation
        navController.addOnDestinationChangedListener { _, destination, _ ->
            if(destination.id == R.id.viewStoriesFragment) {

                binding.bottomNavigation.visibility = View.GONE
            } else {
                binding.bottomNavigation.visibility = View.VISIBLE
            }
        }
    }
}