Android application has the following three types : ,
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l front Activity (Foreground Activities).
l daemon (Background Services).
l intervals Activity (Intermittent Activities).
Activity on this front as
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Doctors hiding something for you , as front-end process running on the phone ; background services system services may be invisible (System Service), System Broadcast ( broadcast ) and Receiver ( broadcast ) receiver ); interval If the process is similar to the implementation of Activity (Threading),
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Each item has a
Android Study Notes
Threaded Mode