Android Dialog for EditText (Kotlin)

class EditTextDialog : DialogFragment() {    companion object {        private const val TAG = "EditTextDialog"        private const val EXTRA_TITLE = "title"        private const val EXTRA_HINT = "hint"        private const val EXTRA_MULTILINE = "multiline"        private const val EXTRA_TEXT = "text"        fun newInstance(title: String? = null, hint: String? = null, text: String? = null, isMultiline: Boolean = false): EditTextDialog {            val dialog = EditTextDialog()            val args = Bundle().apply {                putString(EXTRA_TITLE, title)                putString(EXTRA_HINT, hint)                putString(EXTRA_TEXT, text)                putBoolean(EXTRA_MULTILINE, isMultiline)            }            dialog.arguments = args            return dialog        }    }    lateinit var editText: EditText    var onOk: (() -> Unit)? = null    var onCancel: (() -> Unit)? = null    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {        val title = arguments?.getString(EXTRA_TITLE)        val hint = arguments?.getString(EXTRA_HINT)        val text: String? = arguments?.getString(EXTRA_TEXT)        val isMiltiline = arguments?.getBoolean(EXTRA_MULTILINE) ?: false        // StackOverflowError        // val view = layoutInflater.inflate(R.layout.dialog_edit_text, null)        val view = activity!!.layoutInflater.inflate(R.layout.dialog_edit_text, null)        editText = view.findViewById(R.id.editText)        editText.hint = hint        if (isMiltiline) {            editText.minLines = 3            editText.inputType = InputType.TYPE_TEXT_FLAG_MULTI_LINE or InputType.TYPE_TEXT_FLAG_CAP_SENTENCES or InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS        }        if (text != null) {            // editText.setText(text)            // editText.setSelection(text.length)            editText.append(text)        }        val builder = AlertDialog.Builder(context!!)                .setTitle(title)                .setView(view)                .setPositiveButton(android.R.string.ok) { _, _ ->                    onOk?.invoke()                }                .setNegativeButton(android.R.string.cancel) { _, _ ->                    onCancel?.invoke()                }        val dialog = builder.create()        dialog.window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)        return dialog    }}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="-5dp"
    android:layout_marginRight="-5dp"
    android:paddingLeft="?dialogPreferredPadding"
    android:paddingRight="?dialogPreferredPadding"
    >

    <android.support.design.widget.TextInputLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="8dp"
        android:paddingTop="8dp"
        >

        <android.support.design.widget.TextInputEditText
            android:id="@+id/editText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="top"
            android:inputType="textCapSentences|textNoSuggestions"
            />

    </android.support.design.widget.TextInputLayout>
</FrameLayout>

val dialog = EditTextDialog.newInstance(text = item.name, hint = "Description", isMultiline = true)dialog.onOk = {    val text = dialog.editText.text    // do something}dialog.show(supportFragmentManager, "editDescription")