为什么警报没有按时响起？

Question

我正在我的应用程序中设置闹钟。我为此使用了警报管理器和广播接收器。问题是警报没有按时响起。

有时会按时加注，有时不会。如果设置了多个闹钟，所有闹钟同时响起。

我尝试使用 setInexactRepeating，setRepeating，这两种情况都是这样发生的。我希望闹钟每周重复一次。

请帮忙不知道是什么问题

通知功能

public void setNotificationTime(Calendar c)
{

    Date dateFrom = new Date();
    df = new SimpleDateFormat("E MMM dd hh:mm:ss zzzz yyyy");
    try {
        dateFrom = df.parse(startTime);
    }
    catch (ParseException ex) {

    }

    dateFrom.getTime();
    c.setTime(dateFrom);

    hour = c.get(Calendar.HOUR_OF_DAY);
    minute = c.get(Calendar.MINUTE);


    if(notificationTime.equals("10 Minutes Before"))
    {


        c.set(Calendar.HOUR_OF_DAY, hour);
        c.set(Calendar.MINUTE, minute - 10);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        c.set(Calendar.DATE, day);
        // c.set(Calendar.DAY_OF_WEEK,);

        SetDay(c);

        notification = c.getTime();
        notificationTime = df.format(notification);

        Toast.makeText(getApplicationContext(),notificationTime,Toast.LENGTH_SHORT).show();

        intent = new Intent(getBaseContext(),NotificationReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(getBaseContext(),RQS_1, intent, 0);
        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY * 7, pendingIntent);

    }



    else if(notificationTime.equals("30 Minutes Before"))
    {

        c.set(Calendar.HOUR_OF_DAY, hour);
        c.set(Calendar.MINUTE, minute - 30);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        c.set(Calendar.DATE, day);
        // c.set(Calendar.DAY_OF_WEEK,);

        SetDay(c);

        notification = c.getTime();
        notificationTime = df.format(notification);

        Toast.makeText(getApplicationContext(),notificationTime,Toast.LENGTH_SHORT).show();

        intent = new Intent(getBaseContext(),NotificationReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(getBaseContext(),RQS_1, intent, 0);
        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY * 7, pendingIntent);

    }



    else if(notificationTime.equals("1 Hour Before"))
    {

        c.set(Calendar.HOUR_OF_DAY, hour - 1);
        c.set(Calendar.MINUTE, minute);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        c.set(Calendar.DATE, day);
        // c.set(Calendar.DAY_OF_WEEK,);

        SetDay(c);

        notification = c.getTime();
        notificationTime = df.format(notification);

        Toast.makeText(getApplicationContext(),notificationTime,Toast.LENGTH_SHORT).show();

        intent = new Intent(getBaseContext(),NotificationReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(getBaseContext(),RQS_1, intent, 0);
        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY * 7, pendingIntent);

    }



    else if(notificationTime.equals("2 Hours Before"))
    {

        c.set(Calendar.HOUR_OF_DAY, hour - 2);
        c.set(Calendar.MINUTE, minute);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        c.set(Calendar.DATE, day);
        // c.set(Calendar.DAY_OF_WEEK,);

        SetDay(c);

        notification = c.getTime();
        notificationTime = df.format(notification);

        Toast.makeText(getApplicationContext(),notificationTime,Toast.LENGTH_SHORT).show();

        intent = new Intent(getBaseContext(),NotificationReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(getBaseContext(),RQS_1, intent, 0);
        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY * 7, pendingIntent);

    }
}

通知接收者

 public class NotificationReceiver  extends BroadcastReceiver {


    public static int MY_NOTIFICATION_ID = 0;
    NotificationManager notificationManager;
    Notification myNotification;

    EventTableHelper db;

    @Override
    public void onReceive(Context context, Intent intent) {


        Toast.makeText(context, "Time is set", Toast.LENGTH_LONG).show();

        db = new EventTableHelper(context);

        List<EventData> testSavings = db.getAllEvents();

        for (EventData ts : testSavings) {
            String log = "from date:" + ts.getFromDate()
                    + " ,to date: " + ts.getToDate()
                    + " ,location: " + ts.getLocation()
                    + " ,title " + ts.getTitle();

            Calendar c = Calendar.getInstance();
            Date date = new Date();
            Date date1 = new Date();
            Log.d("Result: ", log);

            SimpleDateFormat df = new SimpleDateFormat("E MMM dd hh:mm:ss zzzz yyyy");
            SimpleDateFormat df2 = new SimpleDateFormat("hh:mm a");

            try {
                date = df.parse(ts.getFromDate());
                date1 = df.parse(ts.getToDate());
            } catch (ParseException ex) {

            }
            String timeFrom = df2.format(date);
         //   String startTime = String.valueOf(timeFrom);

            String timeTo = df2.format(date1);
           // String endTime = String.valueOf(timeTo);


            String location = ts.getLocation();
            String title = ts.getTitle();


            Intent myIntent = new Intent(context, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(
                    context,
                    0,
                    myIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT);

            if(location.equals(""))
            {
                String msg = "From : " + timeFrom + "\nTo : " + timeTo;

                myNotification = new NotificationCompat.Builder(context)
                        .setContentTitle("Event : " + title)
                        .setContentText(msg)
                        .setWhen(System.currentTimeMillis())
                        .setContentIntent(pendingIntent)
                        .setAutoCancel(true)
                        .setSmallIcon(R.drawable.eventicon)
                        .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                        .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
                        .setDefaults(Notification.DEFAULT_SOUND)
                        .build();

            }

            else
            {
                String msg = "From : " + timeFrom + "\nTo : " + timeTo + "\nAt : " + location;
                myNotification = new NotificationCompat.Builder(context)
                        .setContentTitle("Event : " + title)
                        .setContentText(msg)
                        .setWhen(System.currentTimeMillis())
                        .setContentIntent(pendingIntent)
                        .setAutoCancel(true)
                        .setSmallIcon(R.drawable.eventicon)
                        .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                        .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
                        .setDefaults(Notification.DEFAULT_SOUND)
                        .build();

            }

            Log.i("Notify", "Notification");
            notificationManager =
                    (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(MY_NOTIFICATION_ID, myNotification);

            myNotification.flags=Notification.FLAG_AUTO_CANCEL;

            Intent i = new Intent();
            i.putExtra("notificationId",MY_NOTIFICATION_ID);

            MY_NOTIFICATION_ID ++;

        }
    }
}

谁能帮忙..

Answer 1

您的目标是 API 4.4+ 设备上的 19+ 级吗？如果是这样，则没有方法来安排精确的重复事件。见 AlarmManager.setRepeating() :

Note: as of API 19, all repeating alarms are inexact. If your application needs precise delivery times then it must use one-time exact alarms, rescheduling each time as described above. Legacy applications whose targetSdkVersion is earlier than API 19 will continue to have all of their alarms, including repeating alarms, treated as exact.

我认为这是设计使然，以劝阻开发人员：唤醒设备会更快耗尽电池电量。

为什么警报没有按时响起？

Why alarms does not raise on time?

android

raise

broadcastreceiver

alarm

android-notifications