In a break from tradition, the availability of an official SDK for Android 2.1 trailed availability of a phone running it -- the Nexus One, of course -- by nearly a week, undoubtedly leaving countless developers sleepless.
Date: January 2010
API Level: 7
Android 2.1 is a minor platform release deployable to Android-powered handsets starting in January 2010. This release includes new API changes and bug fixes. For information on changes, see the Framework API section.
For developers, the Android 2.1 platform is available as a downloadable component for the Android SDK. The downloadable platform includes a fully compliant Android library and system image, as well as a set of emulator skins, sample applications, and more. The downloadable platform includes no external libraries.
To get started developing or testing against the Android 2.1 platform, use the Android SDK and AVD Manager tool to download the platform into your Android SDK. For more information, see Adding SDK Components.