I'm using UsageStatsManager API to get usage statistics for a certain time interval. All works fine if I use the predefined intervals i.e. INTERVAL_DAILY, INTERVAL_WEEKLY, INTERVAL_MONTHLY, INTERVAL_YEARLY. But if I want to view the data for the past 2 or 3 hours, I am getting today's data for the whole day. I have tried using Calendars and System.currentTimeMillis() but that didn't give me filtered results.
Calendar approach :
Calendar startCalendar = Calendar.getInstance();
startCalendar.add(Calendar.HOUR_OF_DAY, -2);
Calendar endCalendar = Calendar.getInstance();
And pass this to queryUsageStats method like this:
usageList = usm.queryUsageStats(interval, startCalendar.getTimeInMillis(), endCalendar.getTimeInMillis());
where interval is INTERVAL_BEST.
System.currentTimeMillis() approach :
long startTime = System.currentTimeMillis() - 7200*1000 // 7200 seconds i.e. 2 hrs
long endTime = System.currentTimeMillis();
Pass this to queryUsageStats just like above :
usageList = usm.queryUsageStats(interval, startTime, endTime);
where interval is again INTERVAL_BEST.
I'd like to know whether it's possible to get data for this duration i.e. less than a day, as the INTERVAL_BEST hasn't been documented properly to include this information. Any help would be appreciated as I'm stuck on this problem.
As UsageStatsManager doc says:
A request for data in the middle of a time interval will include that interval.
It seems that usage data is stored in buckets, and minimum bucket is a day, so you can't query usage stats for period less than a day. Even if you query a one-hour interval for a particular day, usage stats for the whole day is returned.