Unable to cancel the alarm from AlarmManager

Question

I have an AlarmManager that notifies me every 10 seconds. Everything works just fine but for some reason I can't cancel the alarm. Here's my code.

public class AlarmNotifReceiver extends BroadcastReceiver {

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

public void SetAlarm(Context context)
{
    AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    Intent i = new Intent(context, AlarmNotifReceiver.class);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
    am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 10*1000, pi); // Millisec * Second
}

public void CancelAlarm(Context context)
{
    Intent i = new Intent(context, AlarmNotifReceiver.class);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
    AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    am.cancel(pi);
}


}

as expected I call this CancelAlarm() method from my other classes but for some reason it does not cancel and keep notifying me like nothing happened. Note: SetAlarm() also works just fine.

Thanks in advance.

You may be interested in http://stackoverflow.com/questions/7295604/how-to-set-an-alarm-in-android-java — ErstwhileIII, Feb 25 '14 at 13:14
oh sadly, that is not my problem, I am on my live brand mobile — Suhrahj Rothgar, Feb 25 '14 at 13:34

score 1 · Answer 1 · answered Feb 25 '14 at 13:15

1

Try to cancel Pendingintent--

PendingIntent.getBroadcast(context, 0, intent, 
                           PendingIntent.FLAG_UPDATE_CURRENT).cancel();

Hope this helps

answered Feb 25 '14 at 13:15

Pramod

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score 1 · Accepted Answer · answered Feb 25 '14 at 13:16

Alarm should be created and cancelled on Same Pending intent.In your case you are creating Pending Intent Twice.

Your code should look like below.

public class AlarmNotifReceiver extends BroadcastReceiver {

    PendingIntent pi;
    AlarmManager am;
    Intent i;

    @Override
    public void onReceive(Context context, Intent intent) {
        pi = PendingIntent.getBroadcast(context, 0, i, 0);
        am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        i = new Intent(context, AlarmNotifReceiver.class);
        //things
    }

    public void SetAlarm(Context context) {

        am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 10 * 1000, pi);
    }

    public void CancelAlarm(Context context) {
        am.cancel(pi);
    }


}

This makes the receiver unable to start with a NullPointerException — Suhrahj Rothgar, Feb 25 '14 at 13:31
okay, after struggling a little found out that initializing the PendingIntent twice was the problem, thank you a lot — Suhrahj Rothgar, Feb 25 '14 at 13:47

score 1 · Answer 3 · edited Aug 31 '22 at 14:25

1

Try this.

Android: Get all PendingIntents set with AlarmManager

To cancel all alarm, first you have to find all the pending intent for that and cancel alarm using that.

edited Aug 31 '22 at 14:25

General Grievance

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answered Feb 25 '14 at 13:18

Solution

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score 0 · Answer 4 · answered Feb 25 '14 at 13:16

Try like this

public class AlarmNotifReceiver extends BroadcastReceiver {

AlarmManager am = null;

 @Override
 public void onReceive(Context context, Intent intent)
{
 Intent i = new Intent(context, AlarmNotifReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
//things
}

public void SetAlarm(Context context)
{
am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);

am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 10*1000, pi); // Millisec * Second
}

public void CancelAlarm(Context context)
 {

am.cancel(pi);
}


}

score 0 · Answer 5 · answered Feb 25 '14 at 13:26

0

Your problem is that you're creating a NEW intent instead of cancelling the existing one. Function SetAlarm should place the intent into a "global" variable and the CancelAlarm function should just call am.cancel(global_pi);

The above worked for me in a service, but:

If this is impossible (since that's a Receiver), try setting a new alarm with the (new) intent first.

answered Feb 25 '14 at 13:26

velis

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As long as you're putting `FLAG_CANCEL_CURRENT` flag, then it knows to match and cancel / update. – gunar Feb 25 '14 at 13:29

Unable to cancel the alarm from AlarmManager

5 Answers5