How can I do something, 0.5 second after text changed in my EditText?

Question

I am filtering my list using an EditText. I want to filter the list 0.5 second after user has finished typing in EditText. I used the afterTextChanged

Answer 1

With Kotlin extension functions and coroutines:

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) {}
})}