PSA: Another (Small) AlarmManager Regression

This is not nearly as big of an issue as
yesterday���s WebView regresssion
or even
the original Android 5.1 AlarmManager regression.

However, the
filed issue for that earlier AlarmManager regression
has turned up another regression: on Android 5.1+, you cannot set an alarm to occur
less than 5 seconds in the future from now.

Honestly, I am surprised they allow them to be that low, as that means
a setExact() ���loop��� can achieve every-five-second alarms. And, as
a Googler points out,
this would not be a good idea in the first place:

Note that if you are doing work every 5 seconds it���s quite possible your device is not managing to go to sleep at all, and the most likely behavior is that it will enter power collapse at ~ 3.5 seconds after your work is done, then wake up at the 5-second boundary again. This will probably burn more battery than simply holding a wakelock across the entire scanning period, because coming out of power collapse is very expensive compared to staying awake for a short time.

If you attempt to set an alarm to occur sooner than 5 seconds from
now, your initial alarm time is moved to the 5-seconds mark, just
as setting a repeat period of less than one minute silently extends
that period to one minute.