<receiver android:name="com.intapp.receivers.ReminderReceiver"
              android:exported="false"
              android:enabled="true">
        <intent-filter>
            <action android:name="com.intapp.receivers.NOTIFICATION_ALARM" />
        </intent-filter>
</receiver>

public static final String ACTION = "com.intapp.receivers.NOTIFICATION_ALARM";

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, ReminderReceiver.class);
intent.setAction(ACTION);
int randomNum = new Random().nextInt(Integer.MAX_VALUE - 1 + 1);
PendingIntent alarmIntent = PendingIntent.getBroadcast(context, randomNum, intent, PendingIntent.FLAG_ONE_SHOT);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
     alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), alarmIntent); // I get time from calendar instance in my function
  } else {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), alarmIntent);
            } else {
                alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), alarmIntent);
            }
}

public class ReminderReceiver extends BroadcastReceiver {
      @Override
      public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "Receiver called ");
        // my implementation
     }
}