AlarmManager | XML

import android.app.AlarmManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.icu.util.Calendar
import android.os.Bundle
import android.os.SystemClock
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.fragment.findNavController
import com.neco_desarrollo.alarmmanager.databinding.FragmentFirstBinding

class FirstFragment : Fragment() {
    private val calendar = Calendar.getInstance()
    private lateinit var alarmIntent: PendingIntent
    private var alarmManager: AlarmManager? = null
    private var _binding: FragmentFirstBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        _binding = FragmentFirstBinding.inflate(inflater, container, false)
        return binding.root

    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.timePicker.setIs24HourView(true)
        alarmManager = requireActivity().getSystemService(Context.ALARM_SERVICE) as AlarmManager
        alarmIntent = Intent(context, AlarmReceiver::class.java).let { intent ->
            intent.putExtra("key", "Hello!")
            PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_IMMUTABLE)
        }

        binding.button.setOnClickListener {
            calendar.set(Calendar.HOUR_OF_DAY, binding.timePicker.hour)
            calendar.set(Calendar.MINUTE, binding.timePicker.minute)
              alarmManager?.setExact(
                  AlarmManager.RTC_WAKEUP,
                  calendar.timeInMillis,
                  alarmIntent
              )
        }
        binding.button2.setOnClickListener {
            alarmManager?.setInexactRepeating(
               AlarmManager.ELAPSED_REALTIME_WAKEUP,
               SystemClock.elapsedRealtime(),
               60 * 1000,
                alarmIntent
            )
        }
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }
}