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下载编译Android源码
Installing some soft
1 Install curl： sudo apt-get install curl
2 Install git-core： sudo apt-get install git-core
Installing Repo
1 在用户目录下创建一个~/bin目录，并添加到环境变量中（要将git软件下载安装在此目录，在别的目录运行可能会找不到此软件，所以要添加到环境变量中）
$ mkdir /bin
$ PATH=/bin:$PATH
2 下载repo脚本并修改权限为可执行
$ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo
$ chmod a+x ~/bin/repo
Initializing a Repo client
1 创建一个保存android源码的目录，修改为最大权限，并进入到该目录下
$ mkdir /opt/android4.2
$ sudo chmod ?R 777 /opt/android4.2
$ cd /opt/android4.2
2 初始化repo，并选择要下载的分支（版本）
$ repo init -u https://android.googlesource.com/platform/manifest
$ repo init -u https://android.googlesource.com/platform/manifest -b android-4.2_r1
备注1：在这过程中需要输入你的姓名、邮箱等信息
备注2：查询android版本信息，参考 https://android.googlesource.com/platform/manifest/+refs
Getting the files
$ repo sync
$ vim /etc/hosts
增加下面内容，保存（提前保存好）：
74.125.31.82 http://www.googlesource.com
74.125.31.82 android.googlesource.com
203.208.46.172 cache.pack.google.com
59.24.3.173cache.pack.google.com
74.125.237.1 dl-ssl.google.com
gpg: Signature made Fri 10 Jun 2011 07:52:20 AM CST using DSA key ID 920F5C65
gpg: Can’t check signature: public key not found
error: could not verify the tag ‘v1.7.5’
出错原因是曾使用repo sync从其它库sync过代码，删掉~/.repoconfig即可：
https://android.googlesource.com/new-password
vim ~/.netrc
=== Other Way
1 codeaurora
curl “http://php.webtutor.pl/en/wp-content/uploads/2011/09/repo” > ~/bin/repo-new
chmod a+x ~/bin/repo-new
cd WORKING_DIRECTORY
repo-new init u git://codeaurora.org/platform/manifest.git -b gingerbread , and add “-repo-url=git://codeaurora.org/tools/repo.git” ?
repo-new sync
other branch see: https://www.codeaurora.org/cgit/quic/la/platform/manifest/refs/
2 github
https://github.com/android/platform_manifest
3 grepcode
http://repository.grepcode.com/java/ext/com/google/android/android/
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