Cannot infer a type for this parameter please specify it explicitly? - kotlin

Question

I have recently developed android app using Kotlin but I am getting the following error
Cannot infer a type for this parameter. Please specify it explicitly
below screenshot of the error
below my class where I am getting error
class AddBookingActivity : AppCompatActivity() {
#BindView(R.id.attendees_recycler_view)
internal var mAttendeeRecyclerView: RecyclerView? = null
#BindView(R.id.start_time_edit_text)
internal var mStartTime: EditText? = null
#BindView(R.id.end_time_edit_text)
internal var mEndTime: EditText? = null
private var mAttendeeName: EditText? = null
private var mAttendeeEmail: EditText? = null
private var mAttendeePhoneNumber: EditText? = null
private var mAttendeeAdapter: AttendeeAdapter? = null
private var mAlertDialog: AlertDialog? = null
private val mAttendeeItemList = ArrayList<AttendeeItem>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_add_booking)
ButterKnife.bind(this)
mAttendeeRecyclerView!!.layoutManager = LinearLayoutManager(this)
mAttendeeAdapter = AttendeeAdapter(this)
mAttendeeAdapter!!.setAttendeeList(mAttendeeItemList)
mAttendeeRecyclerView!!.adapter = mAttendeeAdapter
}
#OnClick(R.id.toolbar_back_button)
internal fun onBackButtonClicked() {
onBackPressed()
}
#OnClick(R.id.start_time_edit_text)
internal fun onStartTimeClicked() {
showTimePickerDialog(mStartTime)
}
#OnClick(R.id.end_time_edit_text)
internal fun onEndTimeClicked() {
showTimePickerDialog(mEndTime)
}
#OnClick(R.id.fab_add_attendee)
internal fun onAddAttendeeClicked() {
val inflater = this.layoutInflater
val dialogView = inflater.inflate(R.layout.add_attendee_view, null)
mAttendeeName = dialogView.findViewById(R.id.attendee_name)
mAttendeeEmail = dialogView.findViewById(R.id.attendee_email)
mAttendeePhoneNumber = dialogView.findViewById(R.id.attendee_phone_number)
mAlertDialog = AlertDialog.Builder(this, R.style.AlertDialog)
.setTitle("Input attendee details")
.setPositiveButton("Add") { dialog, which ->
val item = AttendeeItem()
item.name = mAttendeeName!!.text.toString()
item.email = mAttendeeEmail!!.text.toString()
item.phoneNumber = mAttendeePhoneNumber!!.text.toString()
mAttendeeItemList.add(item)
mAttendeeAdapter!!.setAttendeeList(mAttendeeItemList)
mAttendeeAdapter!!.notifyItemInserted(mAttendeeItemList.size)
}
.setNegativeButton("Cancel", null)
.setView(dialogView).create()
mAlertDialog!!.show()
}
private fun showTimePickerDialog(editText: EditText?) {
val myCalender = Calendar.getInstance()
val hour = myCalender.get(Calendar.HOUR_OF_DAY)
val minute = myCalender.get(Calendar.MINUTE)
#SuppressLint("DefaultLocale")
val myTimeListener = { view, hourOfDay, minute1 ->
if (view.isShown()) {
myCalender.set(Calendar.HOUR_OF_DAY, hourOfDay)
myCalender.set(Calendar.MINUTE, minute1)
editText!!.setText(String.format(String.format("%s:%s", hourOfDay.toString(), minute1.toString())))
}
}
val timePickerDialog = TimePickerDialog(this, android.R.style.Theme_Holo_Light_Dialog_NoActionBar, myTimeListener, hour, minute, true)
timePickerDialog.setTitle("Choose hour:")
timePickerDialog.window!!.setBackgroundDrawableResource(android.R.color.transparent)
timePickerDialog.show()
}
}

Answer 1

You have to specify the interface to help Kotlin compiler:
#SuppressLint("DefaultLocale")
val myTimeListener = TimePickerDialog.OnTimeSetListener { view, hourOfDay, minute1 ->
if (view.isShown()) {
myCalender.set(Calendar.HOUR_OF_DAY, hourOfDay)
myCalender.set(Calendar.MINUTE, minute1)
editText!!.setText(String.format(String.format("%s:%s", hourOfDay.toString(), minute1.toString())))
}
}