onAttachedToWindow()

CodeEditText.kt

    var text: Editable = "".toEditable()
        set(value) {
            field = value
            renderCode() // let's keep this for later
        }
    ...
    
    override fun onAttachedToWindow() {
        super.onAttachedToWindow()
        ...
        if (!isInEditMode) {
            llCodeWrapper.removeAllViews()
            for (i in 0 until maxLength) {
                View.inflate(
                    context,
                    R.layout.item_code_edit_text,
                    findViewById(R.id.llCodeWrapper)
                )
            }

            if (text.isNotEmpty()) editCodeReal.text = text
            editCodeReal.filters = arrayOf<InputFilter>(InputFilter.LengthFilter(maxLength))
            editCodeReal.removeTextChangedListener(textChangedListener)
            editCodeReal.addTextChangedListener(textChangedListener)

            llCodeWrapper.setOnClickListener {
                editCodeReal.apply {
                    showKeyboard()
                    focusOnLastLetter()
                }
            }
        }
        ...
    }

    private val textChangedListener = 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(s: Editable) {
            text = s
        }
    }