Kotlin 2-way binding custom view - data-binding

Question

I have 1 custom view that extends ConstraintLayout and contains 1 EditText and 2 TextViews
On my custom view i define this attr (and others) :
<attr name="Text" format="string" />
and i use it like :
app:Text="#={login.email}"
Inside my custom view i define :
companion object {
#JvmStatic #BindingAdapter("Text")
fun setText(nMe : View, nText: String) {
nMe.nInput.setText(nText)
}
#InverseBindingAdapter(attribute = "Text")
fun getText(nMe : View) : String {
return nMe.nInput.text.toString()
}
witch works fine in one-way binding
app:Text="#{login.email}"
But when i try to use it in 2-way binding i get erros pointing to ActivityLoginBinding.java java.lang.String callbackArg_0 = mBindingComponent.null.getText(mEmail);
What to do to get 2-way binding?
L.E : After some research i end up with this :
#InverseBindingMethods(InverseBindingMethod(type =
CustomInput::class,attribute = "bind:Text",event =
"bind:textAttrChanged",method = "bind:getText"))
class CustomEditTextBinder {
companion object {
#JvmStatic
#BindingAdapter(value = ["textAttrChanged"])
fun setListener(editText: CustomInput, listener: InverseBindingListener?) {
if (listener != null) {
editText.nInput.addTextChangedListener(object : TextWatcher {
override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {
}
override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {
}
override fun afterTextChanged(editable: Editable) {
listener.onChange()
}
})
}
}
#JvmStatic
#InverseBindingAdapter(attribute = "Text")
fun getText(nMe: CustomInput): String {
return nMe.nInput.text.toString()
}
#JvmStatic
#BindingAdapter("Text")
fun setText(editText: CustomInput, text: String?) {
text?.let {
if (it != editText.nInput.text.toString()) {
editText.nInput.setText(it)
}
}
}
}
}
But right now i get :
Could not find event TextAttrChanged

Answer 1

I think all you need is event = "android:textAttrChanged".
This works for me (set text to empty String if it is 0):
object DataBindingUtil {
#BindingAdapter("emptyIfZeroText")
#JvmStatic
fun setText(editText: EditText, text: String?) {
if (text == "0" || text == "0.0") editText.setText("") else editText.setText(text)
}
#InverseBindingAdapter(attribute = "emptyIfZeroText", event = "android:textAttrChanged")
#JvmStatic
fun getText(editText: EditText) = editText.text.toString()
}