1. Foreground Activity An application that’s only useful when it’s in the foreground and is
effectively suspended when it’s not visible. Games and map mashups are common examples.
2. Background Service An application with limited interaction that, apart from when being confi
gured, spends most of its lifetime hidden. Examples of this include call screening applications
or SMS auto-responders.
3. Intermittent Activity Expects some interactivity but does most of its work in the background.
Often these applications will be set up and then run silently, notifying users when appropriate.
A common example would be a media player
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