activity-viewstate-actionstate.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    setUpObservation()
}

private fun setUpObservation() {
    viewModel.viewState.observe(this, Observer { state ->
        when (state) {
            is ProfileViewModel.ViewState.ProfileLoaded -> {
                // render avatar, user name, photos etc.
            }
            is ProfileViewModel.ViewState.ProfileLoadFailure -> TODO()
            ProfileViewModel.ViewState.Loading -> {
                // render loading animation
            }
        }
    })

    viewModel.actionState.observe(this, Observer { state ->
        when (state) {
            ProfileViewModel.ActionState.NeedsVerification -> {
                // navigation to Verification screen
            }
            ProfileViewModel.ActionState.NeedsLogOut -> {
                // Clear data, finish this activity and navigate to LogIn screen?
            }
        }
    })
}