Code Sample-1.kt

open class AwesomeFragment(var name: String): Fragment(), TextWatcher {

    public var textToPrependOnTVAfterTextChanged = "Hello "

    init {
        // Make sure we don't crash if name is null
        name = name ?: ""
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate our awesome layout
        return View.inflate(activity!!, R.id.awesome_layout, null) 
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        val textView = view.findViewById<TextView>(R.layout.textView1)
        with (textView) {
            // We want to prepend some awesome text after the initial use of setText()
            addTextChangedListener(this@AwesomeFragment)
            TV = this
        }
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        // Set text
        TV.apply { 
            setText("${name}") 
        }
    }

    override fun onPause() {
        super.onResume()

        // Clean up our references to the TextView field
        TV.removeTextChangedListener(this)
        TV = null
    }

    override fun afterTextChanged(s: Editable?) {
        TV?.apply {
            text = textToPrependOnTVAfterTextChanged + s.toString()
        }
    }

    fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { /* Ignored */ }

    fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { /* Ignored */ }

    companion object {
        lateinit var TV: TextView
    }
}