Question

I am making a small app where I have to set alarm from array but only one alarm is set and working at a time which is at last position of array why it is behaving like this following is my code

AlarmManager[] alarmManager=new AlarmManager[24];
                for(f=0;f<arr2.length;f++)
                {
                    Intent intent = new Intent(AlarmR.this, Riciving.class);
                    pi=PendingIntent.getBroadcast(AlarmR.this, 0,intent, 0);

                    alarmManager[f] = (AlarmManager) getSystemService(ALARM_SERVICE);
                    alarmManager[f].set(AlarmManager.RTC_WAKEUP,arr2[f] ,pi);

                    } 

Thanks in Advance

Answer 1

On your pendingIntent you need to set the second requestCode to a unique number. I usually run the array through a for loop and set the request code dynamically for each item in the array. Without the requestCode the alarms are overwriting each other.

AlarmManager[] alarmManager=new AlarmManager[24];
intentArray = new ArrayList<PendingIntent>();
for(f=0;f<arr2.length;f++){
   Intent intent = new Intent(AlarmR.this, Riciving.class);
   pi=PendingIntent.getBroadcast(AlarmR.this, f,intent, 0);

   alarmManager[f] = (AlarmManager) getSystemService(ALARM_SERVICE);
   alarmManager[f].set(AlarmManager.RTC_WAKEUP,arr2[f] ,pi);

   intentArray.add(pi);

}

Basically, you just want to change requestCode to a dynamic number. By setting it to f you are giving it a new unique id for every item in the array. Keep in mind, if you want to cancel the alarms you will need to use another for loop and cancel each one individually. I personally add all my alarms to their own array so I can handle them separately.

Then if you need to cancel them:

    private void cancelAlarms(){
    if(intentArray.size()>0){
        for(int i=0; i<intentArray.size(); i++){
            alarmmanager.cancel(intentArray.get(i));
        }
        intentArray.clear();
    }
}