android 布局

非常好：

http://www.2cto.com/kf/201201/117910.html

http://www.2cto.com/kf/201201/117911.html

http://www.cnblogs.com/skynet/archive/2010/06/06/1752616.html

http://www.cnblogs.com/skynet/archive/2010/05/20/1740277.html