A kotlin extension

AfterTextChangedDelayed.kt

fun TextView.afterTextChangedDelayed(afterTextChanged: (String) -> Unit) {
    this.addTextChangedListener(object : TextWatcher {
        var timer: CountDownTimer? = null

        override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
        }

        override fun afterTextChanged(editable: Editable?) {
            timer?.cancel()
            timer = object : CountDownTimer(1000, 1500) {
                override fun onTick(millisUntilFinished: Long) {}
                override fun onFinish() {
                    afterTextChanged.invoke(editable.toString())
                }
            }.start()
        }
    })
}