不习惯 ubuntu 界面，只安装了 ubuntu server 版本。
下载并解压好android sdk，如何更新呢？ 就是在命令行使用 android 程序。
/opt/android-sdk-linux/tools$ ./android update sdk help
Error: Argument 'help' is not recognized.
Usage:
android [global options] update sdk [action options]
Global options:
-h --help : Help on a specific command.
-v --verbose : Verbose mode, shows errors, warnings and all messages.
--clear-cache: Clear the SDK Manager repository manifest cache.
-s --silent : Silent mode, shows errors only.
Action "update sdk":
Updates the SDK by suggesting new platforms to install if available.
Options:
--proxy-port: HTTP/HTTPS proxy port (overrides settings if defined)
--proxy-host: HTTP/HTTPS proxy host (overrides settings if defined)
-s --no-https : Uses HTTP instead of HTTPS (the default) for downloads.
-a --all : Includes all packages (such as obsolete and non-dependent ones.)
-f --force : Forces replacement of a package or its parts, even if something has been modified.
-u --no-ui : Updates from command-line (does not display the GUI)
-p --obsolete : Deprecated. Please use --all instead.
-t --filter : A filter that limits the update to the specified types of packages in the form of a comma-separated list of [platform, system-image, tool, platform-tool, doc, sample, source]. This also accepts the identifiers returned by 'list sdk --extended'.
-n --dry-mode : Simulates the update but does not download or install anything.
好了，可以使用命令行更新了：
$ ./android update sdk -u -t platform,platform-tool
$ ./android update sdk -u -t build-tools-20.0.0
使用如下代理服务器：
大连东软信息学院镜像服务器地址:
http://mirrors.neusoft.edu.cn 端口：80
北京化工大学镜像服务器地址:
IPv4: http://ubuntu.buct.edu.cn/ 端口：80
IPv4: http://ubuntu.buct.cn/ 端口：80
IPv6: http://ubuntu.buct6.edu.cn/ 端口：80
上海GDG镜像服务器地址:
http://sdk.gdgshanghai.com 端口：8000
想查看列表
/opt/android-sdk-linux/tools$ ./android list sdk --proxy-host sdk.gdgshanghai.com --proxy-port 8000 -s
Packages available for installation or update: 46
1- Android SDK Tools, revision 24.4.1
2- Android SDK Platform-tools, revision 23.0.1
3- Android SDK Build-tools, revision 23.0.2
4- Documentation for Android SDK, API 23, revision 1
5- SDK Platform Android 6.0, API 23, revision 1
6- SDK Platform Android 5.1.1, API 22, revision 2
7- SDK Platform Android 5.0.1, API 21, revision 2
8- SDK Platform Android 4.4W.2, API 20, revision 2
9- SDK Platform Android 4.4.2, API 19, revision 4
10- SDK Platform Android 4.3.1, API 18, revision 3
11- SDK Platform Android 4.2.2, API 17, revision 3
12- SDK Platform Android 4.1.2, API 16, revision 5
13- SDK Platform Android 4.0.3, API 15, revision 5
14- SDK Platform Android 2.3.3, API 10, revision 2
15- SDK Platform Android 2.2, API 8, revision 3
16- Samples for SDK API 23, revision 2
17- Samples for SDK API 22, revision 6
......
开始获取列表：
/opt/android-sdk-linux/tools$ ./android update sdk --proxy-host sdk.gdgshanghai.com --proxy-port 8000 -s -u -t platform, platform-tool
然后就可以更新了。
如果发现更新后总是提示 There is nothing to install or update.
则返回到上一级目录，删除 temp 文件夹，然后再进入tools目录执行上面命令。
如果还不行，检查 home 目录的.android目录权限是否可写。
如果还不行，再检查代理服务器端口和地址，以及是否使用了 -s 参数强制用 http。
android 程序遇到以上错误不会提示错误，只是提示There is nothing to install or update.
比如网络代理不通也做如此提示，真是坑。
查看其他可以获取的内容：
/opt/android-sdk-linux/tools$ ./android list sdk --proxy-host sdk.gdgshanghai.com --proxy-port 8000 -s --extended
会显示如下内容：
----------
id: 34 or "extra-android-m2repository"
Type: Extra
Desc: Android Support Repository, revision 24 By Android Local Maven repository for Support Libraries Install path: extras/android/m2repository
----------
id: 35 or "extra-android-support"Type: Extra
Desc: Android Support Library, revision 23.1 By AndroidInstall path: extras/android/support
然后再使用 update sdk 取下来，比如去 extra-android-support 就输入如下内容：
/opt/android-sdk-linux/tools$ ./android update sdk --proxy-host sdk.gdgshanghai.com --proxy-port 8000 -s -u -t extra-android-support
或者输入
/opt/android-sdk-linux/tools$ ./android update sdk --proxy-host sdk.gdgshanghai.com --proxy-port 8000 -s -u -t 35
即可。
用命令行方式升级Android SDK：http://www.linuxdiyf.com/linux/14621.html
Ubuntu上安装Google Android SDK环境：http://www.linuxdiyf.com/linux/11581.html
Linux下Android SDK环境搭建：http://www.linuxdiyf.com/linux/11207.html
Ubuntu下使用Android SDK：http://www.linuxdiyf.com/linux/11187.html