Android: Kotlin with Butterknife

Question

I\'m trying to use Kotlin with Butterknife for my Android Application.

Here is my build.gradle

dependencies {
    ...
    compile \'com.jakewharton:b         


        

Answer 1

You can implement some extensions to improve your views behavior. Checkout this example for "onTextChange" in a regular editText:

fun EditText.onTextChange(callback: (text: CharSequence?, start: Int, before: Int, count: Int) -> Unit) {
    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) {
            callback(s, start, before, count)
        }
    })
}

Usage:

m_editText.onTextChange { text, _, _, _ -> 
   m_textView.text = text
}

I vote for kotlin-android-extensions