Android L is an upcoming release of the Android mobile operating system developed by Google. Unveiled on June 25, 2014, and released in a beta the next day for selected Google Nexus devices, it is expected to be released in late 2014.
The most prominent changes to L include a redesigned user interface built around a responsive design language referred to as "Material Design", and improvements to the notification system which allow them to be accessed from the lock screen, and displayed within other apps as banners across the top of the screen. Internal changes were also made to the platform, with the Android Runtime officially replacing Dalvik for improved application performance, and changes intended to improve and optimize battery usage.
Android L was first unveiled on June 25, 2014 during a keynote presentation at the Google I/O developers' conference. Alongside L, the presentation focused on a number of new Android-oriented platforms and technologies, including Android TV, in-car platform Android Auto, wearable computing platform Android Wear, and health tracking platformGoogle Fit. It does not yet have a formal version number or codename.
Part of the presentation was dedicated to a new cross-platform design language referred to as "Material Design". Expanding upon the "card" motifs first seen in Google Now, it is a cleaner design with increased use of grid-based layouts, responsive animations and transitions, padding, and depth effects such as lighting and shadows. Designer Matías Duarte explained that "unlike real paper, our digital material can expand and reform intelligently. Material has physical surfaces and edges. Seams and shadows provide meaning about what you can touch." The material design language will not only be used on Android, but across Google's suite of web software as well, providing a consistent experience between applications and platforms.