allow optionally adding an OK button to the radiogroup dialog

        propMinSdkVersion = 16

        propTargetSdkVersion = propCompileSdkVersion

        propVersionCode = 1

        propVersionName = '3.9.6'

        propVersionName = '3.9.7'

        kotlin_version = '1.2.21'

        support_libs = '27.0.2'

    }

import java.util.*

class RadioGroupDialog(val activity: Activity, val items: ArrayList<RadioItem>, val checkedItemId: Int = -1, val titleId: Int = 0,

                       val cancelCallback: (() -> Unit)? = null, val callback: (newValue: Any) -> Unit) : RadioGroup.OnCheckedChangeListener {

                       showOKButton: Boolean = false, val cancelCallback: (() -> Unit)? = null, val callback: (newValue: Any) -> Unit)

    : RadioGroup.OnCheckedChangeListener {

    val dialog: AlertDialog

    var wasInit = false

    var selectedItemId = -1

            }

        }

        dialog = AlertDialog.Builder(activity)

        val builder = AlertDialog.Builder(activity)

                .setOnCancelListener { cancelCallback?.invoke() }

                .create().apply {

        if (selectedItemId != -1 && showOKButton) {

            builder.setPositiveButton(R.string.ok, { dialog, which -> onCheckedChanged(view.dialog_radio_group, selectedItemId) })

        }

        dialog = builder.create().apply {

            activity.setupDialogStuff(view, this, titleId)

        }