5

目标:如果满足特定条件,通知会在每天下午 2 点出现一次。

示例:为简单起见,假设每天都满足通过 Internet 连接检查的条件。如果今天已经是下午 2 点之后,我们将从明天开始通知。例如,用户在周一下午 4 点启动应用程序,然后在周二下午 2 点、周三下午 2 点、周四下午 2 点等收到通知。

问题:在下午 2 点有第一个通知,但随后我在随机时间一遍又一遍地收到相同的通知。

问题似乎只在 Android >= 4.0 上。它在早期的 Android 上运行良好。

这是我发送通知的方式:

public class NotifyService extends Service
{       
static final int NOTIFICATION_ID = 1;
// ...

@Override
public IBinder onBind(Intent intent)
{
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
    try
    {
        Symbol biggest = getBiggestMover();
        if (biggest != null)
        {
            String title = getString(R.string.app_name);
            String text = getNotificationText(biggest.symbol, biggest.change);
            sendNotification(title, text);
        }
    }
    catch (Exception e)
    {
        // If there is Internet problem we do nothing, don't want to disturb the user.
        e.printStackTrace();
    }

    return super.onStartCommand(intent, flags, startId);
}

/** @return Symbol which is the biggest mover today. If there is no big mover - null is returned.
 * @throws Exception If there is Internet problem. */
private Symbol getBiggestMover() throws Exception
{
    Symbol biggest = null;
    Symbol[] equities = Network.getTraded(SymbolType.EQUITY);
    for (Symbol equity : equities)
    {
        if (Utilities.isToday(equity.lastTraded) && isBigMove(equity.change) && isBigger(equity, biggest))
        {
            biggest = equity;
        }
    }
    return biggest;
}   

private void sendNotification(String title, String text)
{
    Notification notification = new Notification(R.drawable.ic_launcher, text, System.currentTimeMillis());
    notification.flags = Notification.FLAG_AUTO_CANCEL;

    Intent clickIntent = new Intent(this, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, clickIntent, PendingIntent.FLAG_CANCEL_CURRENT);

    notification.setLatestEventInfo(this, title, text, pendingIntent);

    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(NOTIFICATION_ID, notification);
}   
// ...  
}

sendNotification()在下午 2 点被调用,因为AlarmManager

public class ServiceStarter extends BroadcastReceiver
{

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

/** Set repeating notifications every 24 hours. */
public static void setNotificationAlarm(Context context)
{
    Intent intent = new Intent(context, NotifyService.class);
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

    final int oneDay = 24 * 60 * 60 * 1000;
    alarmManager.setRepeating(AlarmManager.RTC, getTriggerTime(), oneDay, pendingIntent);
}

private static long getTriggerTime()
{
    GregorianCalendar calendar = new GregorianCalendar();
    calendar.set(GregorianCalendar.HOUR_OF_DAY, 14);
    calendar.set(GregorianCalendar.MINUTE, 0);
    calendar.set(GregorianCalendar.SECOND, 0);
    calendar.set(GregorianCalendar.MILLISECOND, 0);

    if (calendar.before(new GregorianCalendar()))
    {
        calendar.add(GregorianCalendar.DAY_OF_MONTH, 1);
    }

    return calendar.getTimeInMillis();
}

}

setNotificationAlarm()从 2 个地方调用。首先,在应用程序开始时。其次,从上面的代码中,当手机重新启动时(onReceive()接收BOOT_COMPLETED)。我这样做是因为当用户关闭手机时,它会AlarmManager清除它的警报。

所以一切都应该工作,因为alarmManager.setRepeating()覆盖了以前的警报。

我发现有人有同样的问题,但也没有答案:
https ://groups.google.com/forum/?fromgroups=#!topic/android-developers/t_tDU4PwR3g

同样在这里我发现了类似的问题: http ://comments.gmane.org/gmane.comp.handhelds.android.devel/171471

前段时间我问如何创建这样的通知,所以这是相关的:
每天在特定时间通知

4

2 回答 2

1

在 ICS+ 设备上遇到了同样的问题。我的解决方法非常简单-> 显示通知时将当前时间放在共享首选项中。在此之前,请始终检查间隔是否真的通过,如果不只是中止。

            long lastnotification = sharedPrefs.getLong("lnnd", -1);
            Calendar now = Calendar.getInstance();
            if (!namedayalarmEnabled) {
                    return;
            }
            if (lastnotification > 1) {
                    Calendar last = Calendar.getInstance();
                    last.setTimeInMillis(lastnotification);
                    long distance = (now.getTimeInMillis() - last
                                    .getTimeInMillis());
                    if (distance < YOURINTERVAL) {
                            return;
                    } else {
                            SharedPreferences.Editor editor = sharedPrefs.edit();
                            editor.putLong("lnnd", now.getTimeInMillis());
                            editor.commit();
                    }
            }
于 2012-11-01T13:40:46.480 回答
1

使用 AlarmManager.RTC_WAKEUP 安装的 AlarmManager.RTC

在 AlarmManager.RTC

System.currentTimeMillis() 中的闹钟时间(UTC 挂钟时间)。此警报不会唤醒设备;如果它在设备睡眠时熄灭,则直到设备下次唤醒时才会发送。

在 AlarmManager.RTC_WAKEUP 中

System.currentTimeMillis() 中的闹钟时间(UTC 挂钟时间),它会在设备关闭时唤醒设备。

于 2012-10-30T07:22:59.563 回答