can't get data from edit text, Android Kotlin

I got null data when try to get data from edittext there is my code

class LoginActivity : AppCompatActivity() {
lateinit var etUsername : EditText
lateinit var etPassword : EditText
var username = ""
var password = ""
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_login)
    etPassword = findViewById(R.id.tanggalLahir) as EditText
    etUsername = findViewById(R.id.nomerInduk) as EditText
    username = etUsername.text.toString()
    password = etPassword.text.toString()

    buttonLogin.setOnClickListener() {
        if (username.isEmpty()){
            Log.d("User", "Username = $username")
            nomerInduk.error = "Nomor Induk Kosong!"
            return@setOnClickListener
        }

        if (password.isEmpty()){
            Log.d("User", "Password = $password")
            tanggalLahir.error = "Tanggal Lahir Kosong!"
            return@setOnClickListener
        }

        login(username,password)
    }


}

and there is when i check in log image check log

i already change edittext to textinputedittext but still same

class LoginActivity : AppCompatActivity() {
lateinit var etUsername : EditText
lateinit var etPassword : EditText
var username = ""
var password = ""
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_login)
    etPassword = findViewById(R.id.tanggalLahir) as EditText
    etUsername = findViewById(R.id.nomerInduk) as EditText


    buttonLogin.setOnClickListener() {
username = etUsername.text.toString()
    password = etPassword.text.toString()
        if (username.isEmpty()){
            Log.d("User", "Username = $username")
            nomerInduk.error = "Nomor Induk Kosong!"
            return@setOnClickListener
        }

        if (password.isEmpty()){
            Log.d("User", "Password = $password")
            tanggalLahir.error = "Tanggal Lahir Kosong!"
            return@setOnClickListener
        }

        login(username,password)
    }


}