Navigation Architecture Component - Login screen

Question

I am planning to implement navigation like this:

The problem I face is when us

Answer 1

One of the solutions that i can propose is to override inside your activity onBackPressed method, and finish the activity if your current destination(before on back pressed handled) is login fragment.

override fun onBackPressed() {
    val currentDestination=NavHostFragment.findNavController(nav_host_fragment).currentDestination
    when(currentDestination.id) {
        R.id.loginFragment -> {
            finish()
        }
    }
    super.onBackPressed()
}