LoginArchActivity.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    initView()
    initViewModel()
    initPresenter()
    initEvent()
}
    .
    .
    .

private fun initEvent() {
    val emailWatcher = object: TextWatcher {
        override fun afterTextChanged(s: Editable?) {
        }

        override fun beforeTextChanged(s: CharSequence?,
                                       start: Int,
                                       count: Int,
                                       after: Int) {
        }

        override fun onTextChanged(s: CharSequence?,
                                   start: Int,
                                   before: Int,
                                   count: Int) {
            presenter?.onEmailUpdate(s.toString())
        }
    }

    val passwordWatcher = object: TextWatcher {
        override fun afterTextChanged(s: Editable?) {
        }

        override fun beforeTextChanged(s: CharSequence?,
                                       start: Int,
                                       count: Int,
                                       after: Int) {
        }

        override fun onTextChanged(s: CharSequence?,
                                   start: Int,
                                   before: Int,
                                   count: Int) {
            presenter?.onPasswordUpdate(s.toString())
        }
    }

    binding?.email?.addTextChangedListener(emailWatcher)
    binding?.password?.addTextChangedListener(passwordWatcher)
}