How to count app usage time while app is on foreground?

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I’ve solved the issue.

Adding difference of current time and timestamp of current running app going foreground does the trick.

I just added the following code before the return statement:

UsageEvents.Event lastEvent = allEvents.get(allEvents.size() - 1);
if(lastEvent.getEventType() == UsageEvents.Event.ACTIVITY_RESUMED) {
    int diff = (int)System.currentTimeMillis() - (int)lastEvent.getTimeStamp();
    diff /= 1000;
    Integer prev = appUsageMap.get(lastEvent.getPackageName());
    if(prev == null) prev = 0;
    appUsageMap.put(lastEvent.getPackageName(), prev + diff);
}

It is pretty straightforward, I should have thought about it before posting the question.

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