With just released first a day ago the latest Android 4.2 SDK, Google today has posted the latest revision, the Revision 21 of its Android SDK tools. The update includes new tools and capabilities, allowing and helping users in their work more efficiently to create applications. Tools such as multi-config editor, and new Lint rules help users develop apps more quickly, while the new UI test framework will allow users ways of automatic testing and QA for your apps. This is not it, but three new app templates have been added as well: a full screen, settings, and login activity templates. With sounding like major additions, the new revision having 25 new lint rules along with a one-click SDK installer, and a better Android Virtual Device creation process.