Simple Example of Sealed class using ViewModel

 1.  MyViewModel

MyViewModel

class MyViewModel : ViewModel() {
    private val _state = MutableStateFlow<StateController>(StateController.Empty)
    val state: StateFlow<StateController>
        get() = _state

    fun login(name: String, pass: String) {
        _state.value = StateController.Loading
        viewModelScope.launch {
            delay(2000)

            if (name == "simi" && pass == "123") {
                _state.value = StateController.Success("Authenticated")
            } else {
                _state.value = StateController.Error("Invalid UserID & Password")
            }
        }
    }
}

2. StateController

StateController

package com.example.sealedviewmodelex

sealed class StateController {
    data object Loading : StateController()
    data object Empty : StateController()
    data class Success(val data: String) : StateController()
    data class Error(val msg: String) : StateController()

}
3. MainActivity
MAinActivity
class MainActivity : AppCompatActivity() {
    lateinit var viewModel: MyViewModel
    lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        viewModel = ViewModelProvider(this)[MyViewModel::class.java]
        binding.clickMe.setOnClickListener {
            viewModel.login(binding.username.text
                .toString(), binding.password.text.toString())
        }
        lifecycle.coroutineScope.launchWhenCreated {
            viewModel.state.collect {
                when (it) {
                    is StateController.Error -> {
                        binding.progress.visibility=View.GONE
                        Snackbar.make(binding.root, it.msg, Snackbar.LENGTH_SHORT).show()
                    }

                    is StateController.Loading -> {
                        binding.progress.visibility = View.VISIBLE
                    }

                    is StateController.Success -> {
                        binding.progress.visibility=View.GONE
                        Snackbar.make(binding.root, "Authenticated", Snackbar.LENGTH_SHORT).show()
                    }

                    StateController.Empty -> {

                    }
                }
            }
        }
    }
}

4. Dependencies
libs class:
lifecycle_version = "2.8.4"
androidx-lifecycle-viewmodel-ktx = { group = "androidx.lifecycle", 
name = "lifecycle-viewmodel-ktx", version.ref = "lifecycle_version" }
buildFeatures{
    dataBinding=true
}
implementation(libs.androidx.lifecycle.viewmodel.ktx)