参考：http://source.android.com/source/index.html
参考官方文档，完全可以编译出来，但是官方文档还是没有自己写一遍记得清楚啊。
1. 搭建环境
安装JDK 在 Ubuntu11下android 源码编译 step by step -1 安装ubuntu和jdk 中已经介绍。
2. 安装所需库文件。
64-bit (recommended)
$ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev lib32ncurses5-dev ia32-libs
x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev libgl1-mesa-dev g++-multilib mingw32 tofrodos python-markdown libxml2-utilsxsltproc
On Ubuntu 10.10:
$ sudo ln -s /usr/lib32/mesa/libGL.so.1 /usr/lib32/mesa/libGL.so
On Ubuntu 11.10:
$ sudo ln -s /usr/lib/i386-linux-gnu/libX11.so.6 /usr/lib/i386-linux-gnu/libX11.so
32-bit (experimental)
$ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev libncurses5-dev x11proto-core-dev libx11-dev libreadline6-dev libgl1-mesa-dev tofrodos python-markdown libxml2-utils xsltproc
3。 下载源码
$ mkdir ~/bin
$ PATH=~/bin:$PATH
$ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo
$ chmod a+x ~/bin/repo
$ mkdir WORKING_DIRECTORY
$ cd WORKING_DIRECTORY
$ repo init -u https://android.googlesource.com/platform/manifest
$ repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1
$ repo sync
$ gpg --import
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-----END PGP PUBLIC KEY BLOCK-----
$ git tag -v TAG_NAME