Activity viewModel

SubViewModel.kt

import android.arch.lifecycle.LiveData
import android.arch.lifecycle.MutableLiveData
import android.arch.lifecycle.ViewModel
import android.text.TextUtils
import com.google.firebase.auth.FirebaseAuth

class SubViewModel : ViewModel(), FirebaseAuth.AuthStateListener{
    private val mAuth : FirebaseAuth = FirebaseAuth.getInstance()
    private val _authLivedata : MutableLiveData<AuthState> = MutableLiveData()
    val authLivedata : LiveData<AuthState>
    get() = _authLivedata

    init {
        mAuth.addAuthStateListener(this)
    }
    override fun onAuthStateChanged(p0: FirebaseAuth) {
        _authLivedata.postValue(AuthState(Progress.DONE, p0))
    }

    override fun onCleared() {
        super.onCleared()
        mAuth.removeAuthStateListener(this)
    }

    fun signInUser(email : String, password : String){
        if (!TextUtils.isEmpty(email) || !TextUtils.isEmpty(password)) {
            _authLivedata.postValue(AuthState(Progress.LOADING, null))
            mAuth.signInWithEmailAndPassword(email, password)
        }
    }

    fun createAccount(email : String, password: String){
        if (!TextUtils.isEmpty(email) || !TextUtils.isEmpty(password)) {
            _authLivedata.postValue(AuthState(Progress.LOADING, null))
            mAuth.createUserWithEmailAndPassword(email, password)
        }
    }
}