How to Set Multiple Alarms Using Alarm Manager in Android

How to set multiple alarms using alarm manager in android

You need to use different Broadcast id's for the pending intents. Something like
this:

Intent intent = new Intent(load.this, AlarmReceiver.class);
final int id = (int) System.currentTimeMillis();
PendingIntent appIntent = PendingIntent.getBroadcast(this, id, intent, PendingIntent.FLAG_ONE_SHOT);

Using the system time should be a unique identifier for every pending
intent you fire.

android alarmmanager multiple alarms, one overwrites the other?

PendingIntent pendingIntent1 = PendingIntent.getActivity(getApplicationContext(), 0, intent1, PendingIntent.FLAG_ONE_SHOT);

change the 0 attribute to an id for your alarm, for example you have three alarms,

repeat the above code with 0,1,2.

this way they won't override each other.

Multiple Alarms using BroadcastReceiver and AlarmManager

You can put an "extra" in the Intent that identifies which alarm it is. For example:

_myIntent.putExtra("alarm", "A");

Do this before calling PendingIntent.getBroadcast() for each different alarm.

Then, in your BroadcastReceiver.onReceive() you can check the "extra" in the Intent to determine which alarm got triggered.

Android Set Multiple Alarms

If you want to set multiple alarms (repeating or single), then you just need to create their PendingIntents with different requestCode. If requestCode is the same, then the new alarm will overwrite the old one.

Here is the code to create multiple single alarms and keep them in ArrayList. I keep PendingIntent's in the array because that's what you need to cancel your alarm.

// context variable contains your `Context`
AlarmManager mgrAlarm = (AlarmManager) context.getSystemService(ALARM_SERVICE);
ArrayList<PendingIntent> intentArray = new ArrayList<PendingIntent>();

for(i = 0; i < 10; ++i)
{
   Intent intent = new Intent(context, OnAlarmReceiver.class);
   // Loop counter `i` is used as a `requestCode`
   PendingIntent pendingIntent = PendingIntent.getBroadcast(context, i, intent, 0);
   // Single alarms in 1, 2, ..., 10 minutes (in `i` minutes)
   mgrAlarm.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, 
                SystemClock.elapsedRealtime() + 60000 * i, 
                pendingIntent); 

   intentArray.add(pendingIntent);
}

Also, see this question: How to set more than one alarms at a time in android?.

How to set multiple alarms in android,last alarm overwrites preveious alarms in this case

You need to use unique id´s for your PendingIntent:

pint=PendingIntent.getBroadcast(this,id,alarmintent,0);

So be sure that the second paramter of PendingIntent, the requestCode, is used only once. Also, you should implement a logic, that you can cancel the alarm every time. For canceling, you have to use the same id.

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