Making a input password dialog programmatically

MakingPasswordDialog.kt

// activity with android:windowSoftInputMode="stateHidden"

private fun showPasswordDialog() {
        val context = this.context ?: return
        val editText = EditText(context)
        editText.inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
        editText.filters = arrayOf(InputFilter.LengthFilter(4))

        val frame = FrameLayout(context)
        frame.addView(editText)
        val param = FrameLayout.LayoutParams(-1, -2)
        param.marginStart = UiUtil.dp2px(16f)
        param.marginEnd = UiUtil.dp2px(16f)
        editText.layoutParams = param

        val dialog = MaterialAlertDialogBuilder(context)
            .setView(frame)
            .setTitle(R.string.open_content)
            .setMessage(R.string.use_password_for_content)
            .setPositiveButton(R.string.confirm) { _, _ ->
                getMainHandler()?.post { handleInputPassword(editText.text.toString()) }
            }
            .setNegativeButton(R.string.cancel) { _, _ ->
            }
            .setNeutralButton(R.string.reset_password) { _, _ ->
                showResetPasswordDialog()
            }
            .create()
        dialog.setOnShowListener {
            editText.requestFocus()
            getMainHandler()?.postDelayed({
                UiUtil.showKeyboard(context, editText)
            }, 100)
        }
        dialog.setOnDismissListener {
            getMainHandler()?.postDelayed({
                hideKeyboard()
                editText.clearFocus()
            }, 100)
        }

        editText.setOnEditorActionListener { _, actionId, _ ->
            if (actionId == EditorInfo.IME_ACTION_DONE) {
                val typed = editText.text.toString()
                getMainHandler()?.post { handleInputPassword(typed) }
                dialog.dismiss()
                return@setOnEditorActionListener true
            }
            return@setOnEditorActionListener false
        }

        dialog.show()
    }