The Android platform is a software stack for mobile devices including an operating system, middleware and key applications. Developers can create applications for the platform using the Android SDK. Applications are written using the Java programming language and run on Dalvik, a custom virtual machine designed for embedded use, which runs on top of a Linux kernel.
If you want to know how to develop applications for Android, you're in the right place. This site provides a variety of documentation that will help you learn about Android and develop mobile applications for the platform.

What's New in This Release:
Dependencies:
· Android SDK Platform-tools revision 15 or later.
· If you are developing in Eclipse with ADT, note that the SDK Tools r21 is designed for use with ADT 21.0.0 and later. If you haven't already, update your ADT Plugin to 21.0.0.
· If you are developing outside Eclipse, you must have Apache Ant 1.8 or later.
General Notes:
· Build System
· Added a flag that sets jumbo mode for DEX files, which allows a larger number of strings in the DEX files.
· Improved the build time by pre-dexing libraries (both JAR files and library projects).
· Updated the build to generate R resource classes for library projects with only the IDs needed by the libraries, reducing the risk of hitting DEX file limits for fields and methods.
· Improved the build so that several editing features (code completion, resource chooser, go to declaration) properly handle library project resources.
· Lint
· Added over 25 new lint rules for resources, locale settings, layout files, incorrect use o...