Delete alarm from AlarmManager using cancel() - Android

问题

I\'m trying to create and delete an alarm in two different methods which are both called at different moments in the application logic.

However when I call AlarmManager\'s cancel() method, the alarm isn\'t deleted.

Here\'s my addAlarm() Method :

AlarmManager alarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);

Intent intent = new Intent(PROX_ALERT_INTENT);
intent.putExtra(\"ALERT_TIME\", alert.date);
intent.putExtra(\"ID_ALERT\", alert.idAlert);
intent.putExtra(\"TITLE\", alert.title);
intent.putExtra(\"GEO_LOC\", alert.isGeoLoc);
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext,
        alert.idAlert, intent, PendingIntent.FLAG_CANCEL_CURRENT);

Calendar calendar = Calendar.getInstance();
calendar.setTime(alert.date);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
Log.e(\"ADD ALERT - WithoutGeoLoc - \",alert.toString());

Here\'s my deleteAlarm() Method :

AlarmManager alarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);

Intent intent = new Intent(PROX_ALERT_INTENT);
intent.putExtra(\"ALERT_TIME\", alert.date);
intent.putExtra(\"ID_ALERT\", alert.idAlert);
intent.putExtra(\"TITLE\", alert.title);
intent.putExtra(\"GEO_LOC\", alert.isGeoLoc);
PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext,
        alert.idAlert, intent, PendingIntent.FLAG_CANCEL_CURRENT);

alarmManager.cancel(pendingIntent);
Log.e(TAG,\"REMOVE ALERT - without GeoLoc\"+alert.toString());

Here\'s my Logcat :

01-23 17:44:07.411: E/ADD ALERT - WithoutGeoLoc -(18789): Alert [latitude=0.0, longitude=0.0, title=bfwu, comments=null, address=null, currency=hrk, idAlert=1, date=Sat Feb 23 17:44:04 CET 2013, isGeoLoc=null]
01-23 17:44:13.032: E/REMOVE ALERT without GeoLoc - (18789): Alert [latitude=0.0, longitude=0.0, title=bfwu, comments=null, address=null, currency=hrk, idAlert=1, date=Sat Feb 23 17:44:04 CET 2013, isGeoLoc=null]

Here\'s a list of pendingIntents in the AlarmManager

Current Alarm Manager state:
Realtime wakeup (now=2013-01-23 17:44:37):
RTC_WAKEUP #48: Alarm{2c1d0588 type 0 com.my.app}
type=0 when=+364d23h59m33s288ms repeatInterval=0 count=0
operation=PendingIntent{2c0a6cb0: PendingIntentRecord{2c1d04e8 com.my.app  broadcastIntent}}
RTC_WAKEUP #47: Alarm{2c2298a0 type 0 com.my.app}
type=0 when=+30d23h59m27s360ms repeatInterval=0 count=0
operation=PendingIntent{2c292af8: PendingIntentRecord{2c22a628 com.my.app broadcastIntent}}

A couple notes:

• RTC_WAKEUP #47 is My Original Alarm
• RTC_WAKEUP #48 is a New Alarm that should have overwritten #47 rather than create a new one.

I have compared the two intents (not pendingIntents) from my add and delete methods using Intent\'s filterEquals() method which returns true ... Yet the alarm is not deleted. What am I doing wrong?

---

UPDATE

Here\'s my saveAlert() method that calls addAlarm() and deleteAlarm()

private void saveAlert() {
    // *** If Modifying Alert => REMOVE OLD ALERT (then add new one)
    Intent intent1 = null, intent2 = null;

    if (alert.idAlert != null) {
        if (alert.isGeoLoc == null || alert.isGeoLoc == false) {
            intent2 = ProximityService.removeProximityAlertWithoutGeoLoc(getApplicationContext(), devisesApp.alertsGlobal.getAlertById(alert));
        } else {
            ProximityService.removeProximityAlert(getApplicationContext(), alert);
        }
    }
    // *** Add Alert
    if (alert.isGeoLoc == null || alert.isGeoLoc == false) {
        intent1 = ProximityService.addProximityAlertWithoutGeoLoc(getApplicationContext(), alert, devisesApp.alertsGlobal);
    } else {
        ProximityService.addProximityAlert(getApplicationContext(), alert, devisesApp.alertsGlobal);
    }

    Log.i(TAG, \"[saveAlert] Alert ID : \" + alert.idAlert);
    devisesApp.alertsGlobal.addById(alert);
    Log.i(\"INTENT EQUALS\", intent1.filterEquals(intent2) + \"\"); // This returns true
}

回答1:

Try this flag:

PendingIntent.FLAG_UPDATE_CURRENT

Instead of:

PendingIntent.FLAG_CANCEL_CURRENT 

So the PendingIntent will look like this:

PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, 
        alert.idAlert, intent, PendingIntent.FLAG_UPDATE_CURRENT)  

(Make sure that you use same alert object and mContext!)

A side note: If you want one global AlarmManager, put the AlarmManager in a static variable (and initialize it only if it's null).

回答2:

Cancelling an alarm is a bit confusing. You have to pass the same ID and IntentPending. Here is an example:

private void resetIntentWithAlarm(int time){


        Intent intentAlarm = new Intent(getApplicationContext(), DownloadService.class);
        intentAlarm.putExtra(Your Key, Your stuff to pass here);

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        PendingIntent pendingIntent = PendingIntent.getService(
                getApplicationContext(),
                YOUR_ID,
                intentAlarm,
                PendingIntent.FLAG_UPDATE_CURRENT
        );

    if (time != 0) {

        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (60L * 1000L * time), (60L * 1000L * time), pendingIntent);
        Log.i(TAG, "Alarm setted on for " + time + " mins.");
    }
    // if TIME == Zero, cancel alaram
    else {

        alarmManager.cancel(pendingIntent);
        Log.i(TAG, "Alarm CANCELED. Time = " + time);
    }

回答3:

Cancel the alarm from alarm manager on any specific time which you set:

Intent intent = new Intent(context, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager am = (AlarmManager) context.getSystemService(ALARM_SERVICE);
am.cancel(pendingIntent);

回答4:

If you want to cancel the alarm manager just put the wright id in pending intent and just call cancel() in alarm manager for that pending intent.

来源：https://stackoverflow.com/questions/14485368/delete-alarm-from-alarmmanager-using-cancel-android