Kotlin Android debounce

Question

Is there any fancy way to implement debounce logic with Kotlin Android?

I\'m not using Rx in project.

There is a way in Java, but it is too big

Answer 1

Thanks to https://medium.com/@pro100svitlo/edittext-debounce-with-kotlin-coroutines-fd134d54f4e9 and https://stackoverflow.com/a/50007453/2914140 I wrote this code:

private var textChangedJob: Job? = null
private lateinit var textListener: TextWatcher

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {

    textListener = object : TextWatcher {
        private var searchFor = "" // Or view.editText.text.toString()

        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) {
            val searchText = s.toString().trim()
            if (searchText != searchFor) {
                searchFor = searchText

                textChangedJob?.cancel()
                textChangedJob = launch(Dispatchers.Main) {
                    delay(500L)
                    if (searchText == searchFor) {
                        loadList(searchText)
                    }
                }
            }
        }
    }
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    editText.setText("")
    loadList("")
}


override fun onResume() {
    super.onResume()
    editText.addTextChangedListener(textListener)
}

override fun onPause() {
    editText.removeTextChangedListener(textListener)
    super.onPause()
}


override fun onDestroy() {
    textChangedJob?.cancel()
    super.onDestroy()
}

I didn't include coroutineContext here, so it probably won't work, if not set. For information see Migrate to Kotlin coroutines in Android with Kotlin 1.3.