如何下载一个Cygwin离线安装包
Unable to execute dex: Java heap space
Permission is only granted to system app
ListActivity has a default layout that consists of a single, full-screen list in the center of the screen. However, if you desire, you can customize the screen layout by setting your own view layout with setContentView() in onCreate().
Handler class should be static
为了使内部类访问外部类的私有成员，编译器生成了形似 “外部类.access$XYZ”的函数。XYZ为数字。X是按照私有成员在内部类出现的顺序递增的。YZ为02的话，标明是基本变量成员；YZ为00的话标明是对象成员或者函数。
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