Delete alarm from AlarmManager using cancel() - Android

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).

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);    }

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);