第一件事:

AndroidManifest.xml

AndroidManifest.xml

<receiver
  android:name="com.example.name.Receiver"
  android:enabled="true"
  android:exported="true">
   <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
    <action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />
   </intent-filter>
</receiver>

然后，在这种情况下，在您的 Fragment 中，我建议在其他地方执行此操作:

Then, in this case in your Fragment, however, I suggest doing this somewhere else:

val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
val intent = Intent(context, Receiver::class.java)

// Used for filtering inside Broadcast receiver
intent.action = "MyBroadcastReceiverAction"
val pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0)

// In this particular example we are going to set it to trigger after 30 seconds.
// You can work with time later when you know this works for sure.
val msUntilTriggerHour: Long = 30000
val alarmTimeAtUTC: Long = System.currentTimeMillis() + msUntilTriggerHour

// Depending on the version of Android use different function for setting an 
// Alarm.
// setAlarmClock() - used for everything lower than Android M
// setExactAndAllowWhileIdle() - used for everything on Android M and higher
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M) {
  alarmManager.setAlarmClock(
  AlarmManager.AlarmClockInfo(alarmTimeAtUTC, pendingIntent),
  pendingIntent
  )
} else {
  alarmManager.setExactAndAllowWhileIdle(
  AlarmManager.RTC_WAKEUP,
  alarmTimeAtUTC,
  pendingIntent
  )
}

在您的广播接收器中，我们执行以下操作:

In your Broadcast Receiver, we then do the following:

class Receiver : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        // We use this to make sure that we execute code, only when this exact 
        // Alarm triggered our Broadcast receiver
        if (intent?.action == "MyBroadcastReceiverAction") {
           Log.d("ALARM", "RECEIVED")
        }
    }
}