Before building the android source

What I forgot to mention in the previous is that the environment setting.
Before we start downloading and compiling the android source code, there are
some important stuff we need to do first.
1.according to the website, we need to download the jdk6 for Gingerbread and newer. And jdk5 for froyo or older.

  The following is how to do this.
   add deb http://us.archive.ubuntu.com/ubuntu/ jaunty multiverse
          deb http://us.archive.ubuntu.com/ubuntu/ jaunty-updates multiverse
   in your /etc/apt/source.list
  
   and sudo apt-get update
          sudo apt-get install sun-java5-jdk(for jdk5)
  
after that the sun java jdk5 is installed.
you can use : update-alternatives --config java 
to change which version you want.


2. the rest of the package is just like the website says. follow those steps and you can start download and compile your android.