Android 3.0 is now available for the Android SDK. It offers a redesigned UI and all new developer APIs for an optimized experience on tablets and similar devices. For more information about what's in Android 3.0, read the version notes.
If you have an existing SDK, add Android 3.0 as an SDK component. If you're new to Android, install the SDK starter package.
know more: Final Android 3.0 Platform and Updated SDK Tools