I am trying to change the navigation icon when opening the settings fragment using

CodePudding user response：

Try this

navController.addOnDestinationChangedListener { _, destination, _ ->
            Log.d(TAG, "addOnDestinationChangedListener: "   destination.id)

            if (destination.id == R.id.settingsFragment) {
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
                if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
                    drawerLayout.closeDrawer(GravityCompat.START)

                }

               binding.toolbar.setNavigationOnClickListener { //do whatever you want here

                   navController.navigateUp()
               }


            } else {
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)

                binding.toolbar.setNavigationOnClickListener{
                    drawerLayout.openDrawer(GravityCompat.START)
                }

            }


   override fun showBackIcon() {
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        supportActionBar?.setDisplayShowHomeEnabled(true)
        binding.toolbar.setNavigationIcon(R.drawable.ic_arrow_back_24)
    }

and remove showHamburgerIcon & ActionBarDrawerToggle codes