android


How to find out that RSS feed is updated?


I have to write an Android RSS reader. Before start, I have some questions and I'll be glad if you help me to find the answers:
Assume that RSS XML file contains 10 last items. If I could go
deeper and load more items, what should I do?
How to know that
RSS feed is updated? Is checking feed periodically the only way?
Assume that RSS XML file contains 10 last items and I get all of
them. The next time I check the RSS feed, two new items is added to
RSS feed. Now RSS XML contains items 2-12. This means that I have
downloaded 8 items twice. Is there a way to prevent this and query
for only new items?

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