Issue with cancelling the AlarmManager - PendingIntent

Question

I have an app which reminds people to do their tasks. So there is one PendingIntent, now the user can delete the alarm when he wants to. In this code, there is just one PendingIntent for multiple user alarms so I am confused on cancelling that particular alarm where the intent extras is "pill". The remaining alarms should not be cancelled. I have no clue on this problem. Hope I am clear. Thanks

Intent intent = new Intent(this, AlarmNotifyReceiver.class);
intent.putExtra("Name_pill", "pill");
sender = PendingIntent.getBroadcast(this,
DatabaseConstants.NOTIFICATION_ID + 1, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP,cal.getTimeInMillis(), sender);
updateTheFlag(pillName[(pillName.length-1)]);

Answer 1

According to the Android documentation, in order to stop an alarm, you should create an Intent with the same data, but not necessarily the same extras:

public void cancel (PendingIntent operation)

Remove any alarms with a matching Intent. Any alarm, of any type, whose Intent matches this > one (as defined by filterEquals(Intent)), will be canceled.

filterEquals(Intent)

public boolean filterEquals (Intent other)

Determine if two intents are the same for the purposes of intent resolution (filtering). > That is, if their action, data, type, class, and categories are the same. This does not compare any extra data included in the intents.

Answer 2

As I stated in my comment, it appears that you simply need to recreate the exact same PendingIntent object, and put the same Extras into it. Then, you call

am.cancel(sender);

And your specific alarm should be canceled. I can't find a better way of doing it, personally. I found this information to confirm my expectation elsewhere.

It reads:

Repeating alarms have to be cancelled to stop them. AlarmManager provide a cancel() method that requires the same intent class with which the intent is created. This is how you can cancel the alarm.

alarmManager.cancel(pendingIntent);

Note the pendingIntent object does not need to be same object. The intent fields like action, class, category etc should be same while creating the alarm. The intent is used to identify the alarm to cancel it.

It is in the context of repeating alarms, but one-time alarms should be canceled in the same manner, if I am not mistaken. I am unable to test it more thoroughly on my own because I am at work, but this should work.