Android 5.1源码开放有一个多月啦，但由于城墙的关系，每次想着更新最新源码学习都万般纠结，现在发现国内有开源镜像啦，这就好多啦，感谢清华开源工作团队的无私工作啊。
地址：http://mirrors.tuna.tsinghua.edu.cn/
根据页面上的介绍，该镜像只支持源码sync，不支持sdk更新。
可以看一下他给出的使用帮助：http://mirrors.tuna.tsinghua.edu.cn/help/#AOSP
因为我本地已经安装好了repo工具，所以直接根据使用帮助里面介绍的repo init，然后repo sync就可以了。
下面介绍一下具体的步骤：
repo需要安装最新版本的，如果已经像我一样之前有安装的，可以略过此步。
官方给出的repo下载如下：
mkdir ~/binPATH=~/bin:$PATHcurl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repochmod a+x ~/bin/repo
新建存放源码的目录，我这里为 aosp目录，然后cd进入aosp目录，使用repo init目录来初始化仓库。
google官方给出的sync最新源码的命令为：
repo init -u https://android.googlesource.com/platform/manifest
如果不想获取到最新，只想得到某个指定版本，就需要多加一个-b参数，然后跟具体release版本名
repo init -u https://android.googlesource.com/platform/manifest -b android-4.0.1_r1
可惜国内同样不能用啦，我们要做的就是把-u参数修改为TUNA（清华镜像）的，如下：
repo init -u https://aosp.tuna.tsinghua.edu.cn/aosp/platform/manifest## 如果提示无法连接到 gerrit.googlesource.com，可以编辑 ~/bin/repo，把 REPO_URL 一行替换成下面的：## REPO_URL = 'https://gerrit-google.tuna.tsinghua.edu.cn/git-repo'repo init -u https://aosp.tuna.tsinghua.edu.cn/platform/manifest -b android-5.1.0_r3这里再扩展介绍一下 -b参数的获取，android版本号实在是太多啦，不仅andriod 4.0 5.0的，还有小版本r1 r2，怎么才能搞到正确的分支名呢，而且指定的分支名还需要你的更新源上得有的，通过下面的方式：
cd ~git clone git://aosp.tuna.tsinghua.edu.cn/aosp/platform/manifestcd manifestgit branch -a
这样就会列出清华镜像上aosp所有的分支名啦，从中找到你想要的即可
* master remotes/origin/HEAD -> origin/master remotes/origin/adt_23.0.3 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-2.2.3_r2.1 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-4.0.3_r1.1 remotes/origin/android-4.0.4_r1 remotes/origin/android-4.0.4_r1.1 remotes/origin/android-4.0.4_r1.2 remotes/origin/android-4.0.4_r2 remotes/origin/android-4.0.4_r2.1 remotes/origin/android-4.1.1_r1 remotes/origin/android-4.1.1_r1.1 remotes/origin/android-4.1.1_r2 remotes/origin/android-4.1.1_r3 remotes/origin/android-4.1.1_r4 remotes/origin/android-4.1.1_r5 remotes/origin/android-4.1.1_r6 remotes/origin/android-4.1.1_r6.1 remotes/origin/android-4.1.2_r1 remotes/origin/android-4.1.2_r2 remotes/origin/android-4.1.2_r2.1 remotes/origin/android-4.2.1_r1 remotes/origin/android-4.2.1_r1.1 remotes/origin/android-4.2.1_r1.2 remotes/origin/android-4.2.2_r1 remotes/origin/android-4.2.2_r1.1 remotes/origin/android-4.2.2_r1.2 remotes/origin/android-4.2.2_r1.2b remotes/origin/android-4.2_r1 remotes/origin/android-4.3.1_r1 remotes/origin/android-4.3_r0.9 remotes/origin/android-4.3_r0.9.1 remotes/origin/android-4.3_r1 remotes/origin/android-4.3_r1.1 remotes/origin/android-4.3_r2 remotes/origin/android-4.3_r2.1 remotes/origin/android-4.3_r2.2 remotes/origin/android-4.3_r2.2-cts remotes/origin/android-4.3_r2.3 remotes/origin/android-4.3_r3 remotes/origin/android-4.3_r3.1 remotes/origin/android-4.4.1_r1 remotes/origin/android-4.4.1_r1.0.1 remotes/origin/android-4.4.2_r1 remotes/origin/android-4.4.2_r1.0.1 remotes/origin/android-4.4.2_r2 remotes/origin/android-4.4.2_r2.0.1 remotes/origin/android-4.4.3_r1 remotes/origin/android-4.4.3_r1.0.1 remotes/origin/android-4.4.3_r1.1 remotes/origin/android-4.4.3_r1.1.0.1 remotes/origin/android-4.4.4_r1 remotes/origin/android-4.4.4_r1.0.1 remotes/origin/android-4.4.4_r2 remotes/origin/android-4.4.4_r2.0.1 remotes/origin/android-4.4_r1 remotes/origin/android-4.4_r1.0.1 remotes/origin/android-4.4_r1.1 remotes/origin/android-4.4_r1.1.0.1 remotes/origin/android-4.4_r1.2 remotes/origin/android-4.4_r1.2.0.1 remotes/origin/android-4.4w_r1 remotes/origin/android-5.0.0_r1 remotes/origin/android-5.0.0_r1.0.1 remotes/origin/android-5.0.0_r2 remotes/origin/android-5.0.0_r2.0.1 remotes/origin/android-5.0.0_r3 remotes/origin/android-5.0.0_r3.0.1 remotes/origin/android-5.0.0_r4 remotes/origin/android-5.0.0_r4.0.1 remotes/origin/android-5.0.0_r5 remotes/origin/android-5.0.0_r5.0.1 remotes/origin/android-5.0.0_r5.1 remotes/origin/android-5.0.0_r5.1.0.1 remotes/origin/android-5.0.0_r6 remotes/origin/android-5.0.0_r6.0.1 remotes/origin/android-5.0.0_r7 remotes/origin/android-5.0.0_r7.0.1 remotes/origin/android-5.0.1_r1 remotes/origin/android-5.0.2_r1 remotes/origin/android-5.0.2_r3 remotes/origin/android-5.1.0_r1 remotes/origin/android-5.1.0_r3 remotes/origin/android-5.1.0_r4 remotes/origin/android-5.1.0_r5 remotes/origin/android-5.1.1_r1 remotes/origin/android-5.1.1_r2 remotes/origin/android-5.1.1_r3 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-2.3_r12 remotes/origin/android-cts-4.0.3_r1 remotes/origin/android-cts-4.0.3_r2 remotes/origin/android-cts-4.0_r1 remotes/origin/android-cts-4.1_r1 remotes/origin/android-cts-4.1_r2 remotes/origin/android-cts-4.1_r4 remotes/origin/android-cts-4.2_r2 remotes/origin/android-cts-5.0_r2 remotes/origin/android-cts-5.1_r1 remotes/origin/android-cts-verifier-4.0.3_r1 remotes/origin/android-cts-verifier-4.0_r1 remotes/origin/android-l-preview_r2 remotes/origin/android-sdk-4.0.3-tools_r1 remotes/origin/android-sdk-4.0.3_r1 remotes/origin/android-sdk-4.4.2_r1 remotes/origin/android-sdk-4.4.2_r1.0.1 remotes/origin/android-sdk-adt_r16.0.1 remotes/origin/android-sdk-adt_r20 remotes/origin/android-sdk-support_r11 remotes/origin/android-support-test remotes/origin/android-tsl-2.0 remotes/origin/android-wear-5.0.0_r1 remotes/origin/chromium-dev remotes/origin/droiddriver-dev remotes/origin/froyo remotes/origin/gingerbread remotes/origin/gingerbread-release remotes/origin/gradle-dev remotes/origin/gradle_0.12.2 remotes/origin/gradle_0.13.0 remotes/origin/gradle_0.13.1 remotes/origin/gradle_0.13.2 remotes/origin/gradle_0.13.3 remotes/origin/gradle_0.14.0 remotes/origin/gradle_0.14.1 remotes/origin/gradle_0.14.2 remotes/origin/gradle_0.14.3 remotes/origin/gradle_0.14.4 remotes/origin/gradle_1.0.0 remotes/origin/gradle_1.0.0-rc1 remotes/origin/gradle_1.0.0-rc2 remotes/origin/gradle_1.0.0-rc3 remotes/origin/gradle_1.0.0-rc4 remotes/origin/gradle_1.0.1 remotes/origin/gradle_1.1.0 remotes/origin/gradle_1.1.0-rc1 remotes/origin/gradle_1.1.0-rc2 remotes/origin/gradle_1.1.0-rc3 remotes/origin/gradle_1.1.1 remotes/origin/gradle_1.1.2 remotes/origin/gradle_1.1.3 remotes/origin/gradle_1.2.0 remotes/origin/gradle_1.2.0-beta1 remotes/origin/gradle_1.2.0-rc1 remotes/origin/gradle_1.2.1 remotes/origin/gradle_1.2.2 remotes/origin/gradle_1.2.3 remotes/origin/ics-mr0 remotes/origin/ics-mr1 remotes/origin/ics-plus-aosp remotes/origin/idea133 remotes/origin/idea133-weekly-release remotes/origin/jb-dev remotes/origin/jb-mr1-dev remotes/origin/jb-mr1-dev-plus-aosp remotes/origin/jb-mr1.1-dev remotes/origin/jb-mr1.1-dev-plus-aosp remotes/origin/jb-mr2-cts-dev remotes/origin/jb-mr2-dev remotes/origin/jumper-stable remotes/origin/kitkat-cts-dev remotes/origin/kitkat-dev remotes/origin/l-preview remotes/origin/lollipop-cts-dev remotes/origin/lollipop-dev remotes/origin/lollipop-mr1-cts-dev remotes/origin/lollipop-mr1-dev remotes/origin/master remotes/origin/master-art remotes/origin/master-art-host remotes/origin/master-dalvik remotes/origin/master-dalvik-host remotes/origin/master-soong remotes/origin/ref/for/master remotes/origin/studio-1.0-dev remotes/origin/studio-1.0-release remotes/origin/studio-1.1-dev remotes/origin/studio-1.1-release remotes/origin/studio-1.2-dev remotes/origin/studio-1.2-release remotes/origin/studio-1.3-dev remotes/origin/studio-1.3-release remotes/origin/studio-master-dev remotes/origin/studio-master-release remotes/origin/studio_0.8.6 remotes/origin/studio_1.0.0 remotes/origin/studio_1.0.1 remotes/origin/tools-canary-release remotes/origin/tools_ndk_r9d remotes/origin/tools_r20 remotes/origin/tools_r21 remotes/origin/tools_r21.1 remotes/origin/tools_r22 remotes/origin/tools_r22.2 remotes/origin/tools_r22.6 remotes/origin/tradefed remotes/origin/ub-emulator-master remotes/origin/ub-jack remotes/origin/ub-jack-arzon remotes/origin/ub-jack-arzon-mr2 remotes/origin/ub-jack-brest remotes/origin/ub-jack-lang-dev remotes/origin/ub-tools-idea133 remotes/origin/ub-tools-idea133-milestone remotes/origin/ub-tools-idea133-release remotes/origin/ub-tools-master remotes/origin/ub-webview-m40-release remotes/origin/upstream-mirror-lldb remotes/origin/webview-m40_r1 remotes/origin/webview-m40_r2 remotes/origin/webview-m40_r3 remotes/origin/webview-m40_r4
repo sync这样就开始更新代码啦，速度还不错。
如果你之前已经通过某种途径获得了 AOSP 的源码(或者你只是 init 这一步完成后)， 你希望以后通过 TUNA 同步 AOSP 部分的代码，只需要将 .repo/manifest.xml 把其中的 aosp 这个 remote 的 fetch 从 https://android.googlesource.com 改为 https://aosp.tuna.tsinghua.edu.cn/
<manifest> <remote name="aosp"- fetch="https://android.googlesource.com"+ fetch="https://aosp.tuna.tsinghua.edu.cn" review="android-review.googlesource.com" /> <remote name="github"
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