egorshustov

import android.content.SharedPreferences
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KProperty

class DelegatedPreference<T>(
    private val sharedPrefs: SharedPreferences,
    private val key: String,
    private val defValue: T
) : ReadWriteProperty<Any?, T> {

egorshustov

import android.content.SharedPreferences
import androidx.lifecycle.LiveData

class LivePreference<T>(
    private val sharedPrefs: SharedPreferences,
    private val key: String,
    private val defValue: T
) : LiveData<T?>() {

    private val preferenceChangeListener =

egorshustov

sealed class ResponseMessage {
    class Success(val message: String?) : ResponseMessage()
    class Error(val message: String?, val throwable: Throwable?) : ResponseMessage()

    fun getErrorMessage(): String? {
        return when (this) {
            is Success -> {
                null
            }
            is Error -> {

egorshustov

class LoginViewModel(context: Application) : AndroidViewModel(context) {

...

  fun isUserExists(id: Int) = viewModelScope.async {
    usersRepository.isUserExists(id)
  }

  // But you can also write this way:
  suspend fun isUserExists(id: String): Int  {

egorshustov

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

    progress_auth.visibility = View.VISIBLE

    button_auth.setOnClickListener {
        val actionBar = supportActionBar
      
        GlobalScope.launch(Dispatchers.Main) {