线程进程线程池
android线程和进程 http://erbo2008.iteye.com/blog/756637
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java线程池 http://www.blogjava.net/standlww/archive/2008/10/19/235301.html
java map同步方法 http://www.iteye.com/topic/164644
android保存图片 http://sanfeng-chow.iteye.com/blog/599350
