4

你好！

我在复制 PendingIntents 时遇到了麻烦。我的应用程序具有从应用程序的 onCreate 开始的服务，执行一些异步任务并自行停止。问题是，在每次应用程序启动时，我在 AlarmManager 中都有一组来自 DB 的新 PendingIntents（完全相同），但它们不会取消以前的，即使使用 FLAG_CANCEL_CURRENT。我通过“adb shell dumpsys alarm”确定这一点，
这是异步任务的 onPostExecute：protected void onPostExecute (Cursor c) {

        while (c.moveToNext())
        {
            int _id = c.getInt(c.getColumnIndex(Maindb._ID));
            long remind_timestamp = c.getLong(c
                    .getColumnIndex(Maindb.REMIND_TIMESTAMP));
            String remind_name = c.getString(c.getColumnIndex(Maindb.NAME));
            String remind_description = c.getString(c
                    .getColumnIndex(Maindb.DESCRIPTION));

            Log.i("Service reminders : id = " + _id + "; REMIND_TIMESTAMP="
                    + remind_timestamp + "; NAME = " + remind_name
                    + "; DESCRIPTION=" + remind_description);

            Intent myIntent = new Intent(ReminderService.this,
                    AlarmReceiver.class);

            myIntent.putExtra(RemindDialog.REMIND_DIALOG_ID, _id);
            myIntent.putExtra(RemindDialog.REMIND_DIALOG_NAME, remind_name);
            myIntent.putExtra(RemindDialog.REMIND_DIALOG_DESCRIPTION,
                    remind_description);
            myIntent.putExtra(RemindDialog.REMIND_DIALOG_TIMESTAMP,
                    remind_timestamp);

            pendingIntent = PendingIntent.getService(ReminderService.this,
                    _id, myIntent, PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_ONE_SHOT);

            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

            alarmManager.set(AlarmManager.RTC_WAKEUP, remind_timestamp,
                    pendingIntent);
            Log.i("Successfully setted alarm for ID:TIMESTAMP = " + _id
                    + ":" + remind_timestamp);


        }

        Log.d("Closing cursor");
        c.close();

        Log.d("Nothing else to do, Stoping the services by himself");
        stopSelf();

    }

第二次应用程序启动后“adb shell dumpsys alarm”的输出如下所示：

RTC_WAKEUP #26: Alarm{42096e70 type 0 com.} type=0 when=+93d9h0m54s107ms repeatInterval=0 count=0 operation=PendingIntent{4283e8b8: PendingIntentRecord{426ab530 com.startService}}

RTC_WAKEUP #25: Alarm{41dff7f8 type 0 com.} type=0 when=+93d9h0m54s107ms repeatInterval=0 count=0 operation=PendingIntent{41f1e730: PendingIntentRecord{41e7e1b0 com.startService}}

RTC_WAKEUP #24: Alarm{42161b60 type 0 com.} type=0 when=+76d19h50m54s107ms repeatInterval=0 count=0 operation=PendingIntent{428494d8: PendingIntentRecord{42705b90 com.startService}}

RTC_WAKEUP #23: Alarm{41ef50a8 type 0 com.} type=0 when=+76d19h50m54s107ms repeatInterval=0 count=0 operation=PendingIntent{41f1de18: PendingIntentRecord{41efdcd0 com.startService}}

RTC_WAKEUP #22: Alarm{42549b40 type 0 com.} type=0 when=+51d5h30m54s107ms repeatInterval=0 count=0 operation=PendingIntent{428697e8: PendingIntentRecord{427c9890 com.startService}}

RTC_WAKEUP #21: Alarm{41f2fe20 type 0 com.} type=0 when=+51d5h30m54s107ms repeatInterval=0 count=0 operation=PendingIntent{41fb31a0: PendingIntentRecord{41f3d018 com.startService}}

RTC_WAKEUP #20: Alarm{4269f008 type 0 com.} type=0 when=+21d10h30m54s107ms repeatInterval=0 count=0 operation=PendingIntent{428706f0: PendingIntentRecord{427fd1f0 com.startService}}

RTC_WAKEUP #19: Alarm{41fb1428 type 0 com.} type=0 when=+21d10h30m54s107ms repeatInterval=0 count=0 operation=PendingIntent{41f3c958: PendingIntentRecord{4212d098 com.startService}}

RTC_WAKEUP #18: Alarm{426aa948 type 0 com.} type=0 when=+16d14h16m54s107ms repeatInterval=0 count=0 operation=PendingIntent{42875fb8: PendingIntentRecord{4282bf98 com.startService}}

RTC_WAKEUP #17: Alarm{42554a70 type 0 com.} type=0 when=+16d14h16m54s107ms repeatInterval=0 count=0 operation=PendingIntent{41ec39e8: PendingIntentRecord{426a0620 com.startService}}

所以，主要问题是为什么我的 PendingIntents 重复，因为在第一次看时，第一次和第二次启动应该完全一样（输入 Cursor 肯定是一样的）。

谢谢！对不起我的英语不好。

4

1 回答 1

6

您可能已经更换了，PendingIntent因此您没有重复。但是，您尚未取消之前使用AlarmManager. 为此，您需要致电：

alarmManager.cancel(pendingIntent);

在做之前：

alarmManager.set(AlarmManager.RTC_WAKEUP, remind_timestamp, pendingIntent);

这将取消任何与传递的 匹配的警报PendingIntent。

编辑：以上答案对 OP 没有帮助，可能是错误的（参见 A--C 的评论）

更换时需要使用PendingIntent.FLAG_UPDATE_CURRENT而不是。这应该只产生 1 个预定的警报。PendingIntent.FLAG_CANCEL_CURRENTPendingIntent

问题是，通过PendingIntent在创建新警报时取消现有警报，您无法AlarmManager确定您正在安排的警报正在替换另一个警报（因为它无法比较，PendingIntent因为旧警报不再存在）。

于 2013-01-27T16:42:02.473 回答