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Installing the SDK | Android Developers

http://developer.android.com/sdk/installing.html If you already have an Android SDK, use the Android SDK Manager tool to install updated tools and new Android platforms into your existing environment. For information about how to do that, see Adding SDK Packages .

SDK | Android Developers

http://developer.android.com/sdk/index.html Welcome Developers!
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http://developer.android.com/sdk/eclipse-adt.html Android Development Tools (ADT) is a plugin for the Eclipse IDE that is designed to give you a powerful, integrated environment in which to build Android applications. ADT extends the capabilities of Eclipse to let you quickly set up new Android projects, create an application UI, add packages based on the Android Framework API, debug your applications using the Android SDK tools, and even export signed (or unsigned) .apk files in order to distribute your application. Developing in Eclipse with ADT is highly recommended and is the fastest way to get started.

ADT Plugin for Eclipse | Android Developers

The Android Software Development Kit (Android SDK) provides all necessary tools to develop Android applications.

Android Development Tutorial - Gingerbread

http://www.vogella.de/articles/Android/article.html
http://code.google.com/p/adt-addons/

adt-addons - Additional Eclipse plugins for Android - Google Project Hosting

Android Refactoring supports Rename type , Rename package , Move type refactoring.