Developers have a lot to look forward to with the latest release of Android, but not everything requires Lollipop to run. With the official release of the SDK for API Level 21, Google also included an updated version of the AppCompat Support Library, which contains back-ported versions of UI controls and other features for use on older versions of the OS. Some of the new libraries were first available with the L Preview SDK, but just about everything has received an update, and there are some additions for the official release.
DEVELOPERS! DEVELOPERS!! DEVELOPERS!!! Yeah, ok, I know, the chant has been done to death. But, we at Android Police really do <3 developers. Building great apps is a challenging job and it requires an obscene amount of time. As a developer myself, I know how hard it is to invest an extra hour when I'm already busy writing software, supporting customers, and of course, having a life. Unless you are eager to dive into every last session from Google I/O, all 25 hours of Android-specific content, then you might be wondering which sessions are really worth it for you.