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

1. create a class (I named him BindingAdapters). Then define your bindingAdapter methods.

   @BindingAdapter("app:textChangedListener")
   fun onTextChanged(et: EditText, number: Int) {
   et.addTextChangedListener(object : TextWatcher {
       override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
           if (et.text.toString().trim().length >= number) {
               et.setBackgroundColor(Color.GREEN)
           }
       }
   
       override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
       override fun afterTextChanged(s: Editable) {}
   })
   

   }

2. set this attr for editText in xml layout