AlarmManager不会在每天凌晨2点设置闹钟

Question

我希望AlarmManager每天凌晨2点设置闹钟......所以只有在第一次有人打开应用时才会调用setAlarm以下。我添加了alarmManager.setRepeating，以便每天都会发生。

public class AlarmUtil {

    public static void setAlarm(Context context) {
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        if (alarmManager != null) {
            long start = System.currentTimeMillis();
            Intent in = new Intent("ALARM_RECEIVER");
            PendingIntent pi = PendingIntent.getBroadcast(context, 0, in, PendingIntent.FLAG_CANCEL_CURRENT);
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.SECOND, 0);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.HOUR, 2);
            calendar.set(Calendar.AM_PM, Calendar.AM);
            DateFormat format = new SimpleDateFormat("MMMM dd , yyyy  HH:mm:ss", Locale.ENGLISH);

            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pi);
        }
    }
 }

以下课程是应该在每天凌晨2点调用的课程，无论应用程序是处于活动状态还是非活动状态。

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        context.startService(new Intent(context, AlarmService.class));
    }

但是我的问题是上面的AlarmReceiver每30秒被调用一次或者有些随机发生，但是多次出现，而我希望它每天只能被调用一次。我不明白我哪里出错了？