How to databind to onTextChanged for an EditText on Android?

Question

In Yigit Boyar and George Mount\'s talk on Android Databinding they illustrate how easy it is to bind to TextWatcher\'s onTextChanged (at 13:41). O

Answer 1

If you just need text parameter after text has changed, you could use android:afterTextChanged binding adapter. for example:

android:afterTextChanged="@{(text) -> viewModel.onTextChange(text)}"

Then in your ViewModel just implement like this:

fun onTextChange(editable: Editable?) {
    Log.d("TAG","New text: ${editable.toString()}")
}

Furthermore, there is android:beforeTextChanged which used to know old text before text change event, usage is same as android:afterTextChanged.