restricted to add empty text field

import android.view.LayoutInflater

import android.view.View

import android.widget.Button

import android.widget.Toast

import androidx.appcompat.app.AlertDialog

import androidx.core.content.ContextCompat

import com.jakewharton.rxbinding2.view.clicks

class BlockedNumbersController : QkController<BlockedNumbersView, BlockedNumbersState, BlockedNumbersPresenter>(),

        BlockedNumbersView {

    @Inject override lateinit var presenter: BlockedNumbersPresenter

    @Inject lateinit var colors: Colors

    @Inject lateinit var phoneNumberUtils: PhoneNumberUtils

    @Inject

    override lateinit var presenter: BlockedNumbersPresenter

    @Inject

    lateinit var colors: Colors

    @Inject

    lateinit var phoneNumberUtils: PhoneNumberUtils

    private val adapter = BlockedNumbersAdapter()

    private val saveAddressSubject: Subject<String> = PublishSubject.create()

        val dialog = AlertDialog.Builder(activity!!, R.style.customAlertDialog)

                .setView(layout)

                .setPositiveButton(R.string.blocked_numbers_dialog_block) { _, _ ->

                    if (!layout.input.text.toString().isEmpty()) {

                        saveAddressSubject.onNext(layout.input.text.toString())

                    } else {

                        Toast.makeText(activity, "Not able to add empty text ! please try again", Toast.LENGTH_LONG).show()

                    }

                }

                .setNegativeButton(R.string.button_cancel) { _, _ -> }

                .setOnDismissListener { textWatcher.dispose() }

        dialog.show()

        dialog.show();

//

//

    }

}