java - 设置多个警报/通知错误/错误？

Question

我正在尝试制作一个应用程序，允许用户为每个任务设置任务和警报或通知。我在下面创建了一个“setAlarm”方法。但是，我有一个错误，每当我设置带有警报的多个任务时，不知何故，所有先前的任务都会被取消，并且只有最近设置的警报才会响起。你知道问题出在哪里吗？我的猜测是，每次我调用“setAlarm”时，“日历”实例都会重置。我该如何解决这个问题？

  public void setAlarm() {
      Intent intent1 = new Intent(NewGoal.this, SingleAlarm.class);
      PendingIntent sender = PendingIntent.getBroadcast(NewGoal.this,
              0, intent1, 0);

      Calendar calendar = Calendar.getInstance();
      calendar.setTimeInMillis(System.currentTimeMillis());

      if (alarm_time == 10) {
          calendar.add(Calendar.SECOND, alarm_time);
      } else if (alarm_time == 30 {
          calendar.add(Calendar.SECOND, alarm_time)
      }

      AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
      am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
      Log.i(TEST, "In setAlarm method");
      Log.i(TEST, "calendar=" + calendar.MILLISECOND);
}

Answer 1

来自documentation :

If there is already an alarm scheduled for the same IntentSender, it will first be cancelled.