One week after the launch of the Nexus One, Google has released the Android 2.1 SDK to developers. The SDK is considered a minor update to Android and will roll out to existing handsets starting in January. Unlike previous SDKs which were released before a phone was launched, the Android 2.1 SDK was released after the Nexus One so there are no big surprises. All the new bells and whistles that are seen in the Nexus One are included in the SDK which provides new APIs for animated wallpapers, adds geolocation support to the webkit browser, creates a new SignalStrength class for obtaining the current network signal strength and more. Developers can download the 2.1 SDK using the Android SDK and AVD manager.