Android L

              Android L is new release android mobile operating system which is developed by Google developers. Unveiled on June 25, 2014, and released in a beta the next day for selected Google Nexus devices, it is expected to be released to manufacturing 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 Run time officially replacing Dalvik for improved application performance, and changes intended to improve and optimize battery usage.
            Release A developer preview of Android L was released for the Nexus 5 and 2013 Nexus 7 on June 26, 2014, as a replacement factory image flashed in Fastboot mode. The final release is expected to be made in late-2014