debounce_timer.kt

class MainActivity : AppCompatActivity() {

    private var timer = Timer()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val bindings = ActivityMainBinding.inflate(layoutInflater)
        setContentView(bindings.root)

        with(bindings) {
            userInput.doAfterTextChanged { text ->
                timer.cancel() // cancel any previous delay
                
                timer = Timer() // schedule a new one
                timer.schedule(500L) {
                    // we are in a background thread here
                    userInput.handler.post { userResult.text = text }
                }
            }
        }
    }
}