Example of POST request using ViewModel

POSTRequestUsingViewModel.kt

class LoginViewModel @Inject constructor(private val repository: UsersRepository) : ViewModel() {

    var loginInput: MutableLiveData<LoginRequest> = MutableLiveData()
    val login: LiveData<Resource<User>> = Transformations.switchMap(loginInput) { emailPasswordRequest ->
        repository.login(emailPasswordRequest)
    }
}

class LoginActivity : BaseActivity() {
  //...
  
  override fun onCreate(savedInstanceState: Bundle?) {
  //...

  // Initialize loginViewModel
  loginViewModel = ViewModelProviders.of(this, viewModelFactory).get(LoginViewModel::class.java)

  // Login observer
  loginViewModel.login.observe(this, ResourceObserver(this.localClassName,
       hideLoading = { progress_bar.visibility = View.GONE },
       showLoading = { progress_bar.visibility = View.VISIBLE },
       onSuccess = { _ -> loadSomeDataAndFinish() },
       onError = { message -> Toast.makeText(this, message, Toast.LENGTH_LONG).show() }))
  }
}