我想在一天的某个时间发送通知。 为此我做了一个广播接收器。 但是我有一个问题，广播接收器没有在我想要的时间执行，而是在随机的时间执行（例如，当我启动应用程序时）。下面是我的主activity中的代码，它设置了挂起的意图和一个AlarmManager:

        Intent notifyIntent = new Intent(this, ReminderBroadcast.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, NOTIFICATION_REMINDER, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
    String notificationTime = SettingsSharedPreferences.getDailyNotificationTime(getApplicationContext());

    //sets the notification time, which is saved in Shared Preferences
    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
    Calendar notificationTimeCalendar = Calendar.getInstance();
    notificationTimeCalendar.setTimeInMillis(System.currentTimeMillis());
    try {
        notificationTimeCalendar.setTime(sdf.parse(notificationTime));
    } catch (ParseException e) {
        e.printStackTrace();
    }

    //sets AlarmManager
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, notificationTimeCalendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
    SettingsSharedPreferences.setNotificationTimeChanged(MainActivityTaskAddListNavigation.this, false);