Kotlin addTextChangeListener lambda?

Add this core ktx dependence

implementation 'androidx.core:core-ktx:1.0.0'

You simply have to do

passwordEditText.doAfterTextChanged{ }

A bit old, but using Kotlin Android extensions you can do something like that:

editTextRequest.textChangedListener {
            afterTextChanged {
                // Do something here...
            }
}

No extra code needed, just add:

implementation 'androidx.core:core-ktx:1.0.0'

addTextChangedListener() takes a TextWatcher which is an interface with 3 methods. What you wrote would only work if TextWatcher had only 1 method. I'm going to guess the error you're getting relates to your lambda not implementing the other 2 methods. You have 2 options going forward.

1. Ditch the lambda and just use an anonymous inner class

    editText.addTextChangedListener(object : TextWatcher {
      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) {
      }
    })

2. Create an extension method so you can use a lambda expression:

    fun EditText.afterTextChanged(afterTextChanged: (String) -> Unit) {
        this.addTextChangedListener(object : TextWatcher {
          override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
          }
    
          override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
          }
    
          override fun afterTextChanged(editable: Editable?) {
            afterTextChanged.invoke(editable.toString())
          }
        })
    }

And then use the extension like so:

editText.afterTextChanged { doSomethingWithText(it) }