На Языке Kotlin можно сделать как это

tv_search.addTextChangedListener(mTextWatcher)

private val mTextWatcher: TextWatcher = object : TextWatcher {
        private var timer = Timer()
        private val DELAY: Long = 1000

        override fun afterTextChanged(s: Editable?) {
            timer.cancel();
            timer = Timer()
            timer.schedule(object : TimerTask() {
                override fun run() {
                         //DO YOUR STUFF HERE
                }
            }, 1000)
        }

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

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

    }

Можно использовать таймер после ввода текста, он будет ожидать 600 мс. Вставьте код afterTextChanged () при помощи задержки 600 мс.

@Override
    public void afterTextChanged(Editable arg0) {
        // user typed: start the timer
        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                // do your actual work here
               editText.setText(et.getText().toString());

            }
        }, 600); // 600ms delay before the timer executes the „run“ method from TimerTask
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // nothing to do here
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // user is typing: reset already started timer (if existing)
        if (timer != null) {
            timer.cancel();
        }
    }
};

С дополнительными функциями Kotlin и сопрограммами:

fun AppCompatEditText.afterTextChangedDebounce(delayMillis: Long, input: (String) -> Unit) {
var lastInput = ""
var debounceJob: Job? = null
val uiScope = CoroutineScope(Dispatchers.Main + SupervisorJob())
this.addTextChangedListener(object : TextWatcher {
    override fun afterTextChanged(editable: Editable?) {
        if (editable != null) {
            val newtInput = editable.toString()
            debounceJob?.cancel()
            if (lastInput != newtInput) {
                lastInput = newtInput
                debounceJob = uiScope.launch {
                    delay(delayMillis)
                    if (lastInput == newtInput) {
                        input(newtInput)
                    }
                }
            }
        }
    }

    override fun beforeTextChanged(cs: CharSequence?, start: Int, count: Int, after: Int) {}
    override fun onTextChanged(cs: CharSequence?, start: Int, before: Int, count: Int) {}
})}