告警解释AlarmManager在错误的时间启动

Question

我尝试每天使用AlarmManager做一些任务，如下面的代码所示。

 public void start_alarm(){
    SharedPreferences.Editor editor=alarm_prefs.edit();
    editor.putString("alarm", "alarm");
    editor.apply();
    editor.clear();
    Intent start_alarm=new Intent(MainPage.this,MailService.class);
    PendingIntent pi=PendingIntent.getService(MainPage.this, 100, start_alarm, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.DATE,1);
    calendar.set(Calendar.HOUR_OF_DAY, 12);
    calendar.set(Calendar.MINUTE, 30);
    calendar.set(Calendar.SECOND, 0);
    calendar.set(Calendar.AM_PM, Calendar.AM);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),1000*60*60*24,pi);
}

Alarm在这方面没有问题。但在代码中，我设置了警报在12:30 AM。但上述代码在06:30 AM触发报警。如果我做错了什么，请通知我。我在12:15 AM的其他应用程序中设置了闹钟。但它也在错误的时间，即06:15 AM。

Answer 1

要在12.30 AM设置警报，您可以尝试此代码。

// Set the alarm's trigger time to 12.30 A.M
calendar.add(Calendar.DATE,1);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 30);
calendar.set(Calendar.SECOND, 0);

不是

calendar.add(Calendar.DATE,1);
calendar.set(Calendar.HOUR_OF_DAY, 12);
calendar.set(Calendar.MINUTE, 30);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.AM_PM, Calendar.AM);