Generate int unique id as android notification id

Question

When I send multiple push notifications, I need them to be all shown in the notification bar ordered by the time sent desc. I know I should use unique notification - I tried

Answer 1

Maybe not the best, but definitely the simplest is to use current time.

int oneTimeID = (int) SystemClock.uptimeMillis();
mNotificationManager.notify(oneTimeID, mBuilder.build());

The good: this is the easiest way to get increasing ids.

The bad: time is a long and we're truncating it to half of that. This means that the counter will wrap around every 2'147'483'647 /1000(ms->s)/60(s->m)/60(m->h)/24(h->d) =~25 days.

SystemClock.uptimeMillis() has 2 advantages over currentTimeMillis:

1. discounts all the milliseconds spent at deep sleep, what decreases amount of wraparounds.
2. starts at 0 when the phone is restarted.