在android的状态栏(statusbar)中增加menu，home和back快捷键的方法

Link: http://blog.csdn.net/freshui/article/details/5738115

使用android 操作路由表

Link: http://www.cnblogs.com/simonshi/archive/2011/05/31/2065011.html

android virtual-key implement

reference page: 1. http://blog.csdn.net/skywalkzf/article/details/7354560
2. http://source.android.com/tech/input/touch-devices.html#virtual-key-map-files
3. http://source.android.com/tech/input/validate-keymaps.html