Feature of android version 5.0.2

Android 5.0 introduces a refreshed notification system.
Individual notifications are now displayed on cards to
adhere to the material design language, and batches of
notifications can be grouped by the app that produced
them. Notifications are now displayed on the lock screen
as cards, and "heads up" notifications can also be
displayed as large banners across the top of the screen,
along with their respective action buttons.  A do-
not-disturb feature is also added for notifications. The
recent apps menu was redesigned to use a three-
dimensional stack of cards to represent open apps.
Individual apps can also display multiple cards in the
recent menu, rather than only one entry per app; for
example, a web browser can show all of its open tabs as
individual cards.
Lollipop also contains major new platform features for
developers, with over 5,000 new APIs added for use by
applications. For example, there is the possibility
to save photos in a raw image format . Additionally,
the Dalvik virtual machine was officially replaced by
Android Runtime (ART), which is a new runtime
environment that was introduced as a technology preview
in KitKat.  ART is a cross-platform runtime which
supports the x86 , ARM , and MIPS architectures in both
32-bit and 64-bit environments. Unlike Dalvik, which uses
just-in-time compilation (JIT), ART compiles apps upon
installation , which are then run exclusively from the
compiled version from then on. This technique removes
the processing overhead associated with the JIT process,
improving system performance.
Lollipop also aims to improve battery consumption
through a series of optimizations known as "Project
Volta". Among its changes are a new battery saver mode,
job scheduling APIs which can restrict certain tasks to
only occur over Wi-Fi , and batching of tasks to reduce the
overall amount of time that internal radios are active. The
new developer tool called "Battery Historian" can be used
for tracking battery consumption by apps while in use.
The Android Extension Pack APIs also provide
graphics functions such as new shaders , aiming to
provide PC -level graphics for 3D games on Android
devices.
A number of system-level, enterprise-oriented features
were also introduced under the banner "Android for
Work": Samsung contributed its Knox security framework
for segregating personal and work-oriented data from
each other on a device, along with accompanying APIs
for managing the environment. Devices can also be
configured so that users do not have to unlock their
device with a PIN or pattern if it is within a trusted,
physical location, or is in proximity to a user's Android
Wear device.  Device encryption will be enabled by
default.