from：http://herbertbt.blog.163.com/blog/static/57266582201218102131173/
在网上搜了以下，都是获取某个分支的。如果哦用
repo init -u git://Android.git.kernel.org/platform/manifest.git
取得分支，获得的是最近的正在研发的代码，而不是你想要的稳定代码。
所以我们获取稳定的代码，先要看看当前有些什么branch.
打开android 官网 http://source.android.com/source/downloading.html
获取repo 脚本 ，
（否则可能会得到 “ 在未预料的“newline”附近出现语法错误”，脚本变了）。
curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo
在你的android 目录下：
sudo git clone https://android.googlesource.com/platform/manifest
cd manifest
git branch -a
master
remotes/origin/HEAD -> origin/master
remotes/origin/android-1.6_r1
remotes/origin/android-1.6_r1.1
remotes/origin/android-1.6_r1.2
remotes/origin/android-1.6_r1.3
remotes/origin/android-1.6_r1.4
remotes/origin/android-1.6_r1.5
remotes/origin/android-1.6_r2
remotes/origin/android-2.0.1_r1
remotes/origin/android-2.0_r1
remotes/origin/android-2.1_r1
remotes/origin/android-2.1_r2
remotes/origin/android-2.1_r2.1p
remotes/origin/android-2.1_r2.1p2
remotes/origin/android-2.1_r2.1s
remotes/origin/android-2.2.1_r1
remotes/origin/android-2.2.1_r2
remotes/origin/android-2.2.2_r1
remotes/origin/android-2.2.3_r1
remotes/origin/android-2.2.3_r2
remotes/origin/android-2.2_r1
remotes/origin/android-2.2_r1.1
remotes/origin/android-2.2_r1.2
remotes/origin/android-2.2_r1.3
remotes/origin/android-2.3.1_r1
remotes/origin/android-2.3.2_r1
remotes/origin/android-2.3.3_r1
remotes/origin/android-2.3.3_r1.1
remotes/origin/android-2.3.4_r0.9
remotes/origin/android-2.3.4_r1
remotes/origin/android-2.3.5_r1
remotes/origin/android-2.3.6_r0.9
remotes/origin/android-2.3.6_r1
remotes/origin/android-2.3.7_r1
remotes/origin/android-2.3_r1
remotes/origin/android-4.0.1_r1
remotes/origin/android-4.0.1_r1.1
remotes/origin/android-4.0.1_r1.2
remotes/origin/android-4.0.2_r1
remotes/origin/android-4.0.3_r1
remotes/origin/android-cts-2.2_r8
remotes/origin/android-cts-2.3_r10
remotes/origin/android-cts-2.3_r11
remotes/origin/android-cts-4.0_r1
remotes/origin/android-cts-verifier-4.0_r1
remotes/origin/android-sdk-4.0.3-tools_r1
remotes/origin/android-sdk-4.0.3_r1
remotes/origin/android-sdk-adt_r16.0.1
remotes/origin/froyo
remotes/origin/gingerbread
remotes/origin/gingerbread-release
remotes/origin/ics-mr0
remotes/origin/ics-mr1
remotes/origin/master
remotes/origin/tradefed
默认取得的是master了。
用repo init -u https://android.googlesource.com/platform/manifest -bandroid-2.3.5_r1
就取到了android-2.3.5_r1版本
