Google made an announcement yesterday, that they will be releasing the new Android 4.2 Jelly Bean SDK, and now Google has launched a new version of its Android SDK tools for developers, in the form of Android SDK Tools Revision 21.
If you are an Android Developer, then you can find more information about the Android SDK Tools, Revision 21 over at the Android Developers Blog.
Along with the Android 4.2 SDK, we also launched a brand new update of the Android SDK Tools (Revision 21). The update includes new tools and capabilities that can help you work more efficiently as you create applications. Tools such as a new multi-config editor, and new Lint rules will help you develop apps more quickly, while a new UI test framework will give you more ways automate testing and QA for your apps. For new developers, one-click SDK download and new app templates help you get started more quickly.