我在论坛上看到了这个，但与论坛上需要更新版本才能解决的问题不同，我相信我的软件是最新的。
在 Windows 7 下，Android SDK Manager 显示：
android sdk 工具 21.1 已安装
Android sdk 平台工具 16.0.2 已安装
SDK 路径 c:\users\owner\documents\adt-bundle-windows-x86-20130219\adt-bundle-windows-x86-20130219\sdk
当我尝试通过“file-new-Android Application Project”开始一个项目时，面板报告
---工具需要通过SDK Manager更新
---工具安装过时或未安装
对此的任何指导将不胜感激。
OK. I had viewed this Eclipse ADT and find out the way to get around this issue and able to Update My SDK Tool to 21.1.0.
Solution is : First Update ADT to 21.1.0 and Then Update SDK Tool to 21.1.0
Actually, above link Says,
ADT 21.1.0 is designed for use with SDK Tools r21.1.0. If you haven't already installed SDK Tools r21.1.0 into your SDK, use the Android SDK Manager to do so.
So, What i have to do is to update my ADT to 21.1.0(Latest Version) and then was able to update SDK tool to 21.1.0. i thought only SDK Tool has been updated Not ADT. so i was Updating the SDK Tool with Older ADT Version(21.0.1).
How to Update your ADT to Latest Version?
In Eclipse go to Help
Install New Software ---> Add
inside Add Repository write the Name: ADT (as you want)
and Location: https://dl-ssl.google.com/android/eclipse/
after loading some time you will get Developer Tools and NDK Plugins
check both if you want to use NDK in the future or check Developer Tool only
click Next
Finish
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