使用的Eclipse的版本为：eclipse-java-indigo-SR2-win32
点击菜单"Help" - "Install New Software..."
输入：http://dl-ssl.google.com/android/eclipse
点击"Finish"，开始下载安装"ADT Plugin"。
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若在下载安装时出现如下问题：
1 Cannot complete the install because one or more required items could not be found. 2 ... ...
则需要先安装"WST Server Adapters"，安装办法：【"Help" - "Install New Software..."】
Work With: Indigo - Http://download.eclipse.org/releases/indigo
选择"Web, XML, Java EE and OSGi Enterprise Development"下的"WST Server Adapters"，如下图：
若安装时，无法连上源，试试菜单中的 help - Eclipse Marketplace
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安装完成之后，重启Eclipse进行ADT Plugin的安装即可。
更多请参考：http://developer.android.com/sdk/eclipse-adt.html
windows开发环境搭建：http://www.cnblogs.com/skynet/archive/2010/04/12/1709892.html
ubuntu开发环境搭建：http://coolshell.cn/articles/4270.html