its for android 4.2

1. Features Of Android Jelly Bean 4.2
Android 4.3’s new restricted profiles feature can be used to limit access to apps and content, at
home with your family and at work. And with support for Bluetooth Smart accessories, Android
is ready for a whole new class of mobile apps.
Android 4.2, Jelly Bean improves on the speed and simplicity of Android 4.1 and includes all
new features – Photo Sphere and a completely redesigned camera app, new Gesture Typing
keyboard, Google Now with all new cards, and much more.
Everything in Jelly Bean feels fast, fluid, and smooth. Moving between home screens and
switching between apps is effortless, like turning the pages of a book.
Jelly Bean improves performance throughout the system, including faster orientation
changes, quicker switching between recent apps, and smoother and more consistent rendering
across the system through vsync and triple buffering.
Jelly Bean has more reactive and uniform touch responses, and makes your Android device
even more responsive by boosting your device’s CPU instantly when you touch the screen,
and turns it down when you don’t need it to improve battery life.

2. Android 4.3 introduces built-in platform support for Bluetooth Smart Ready in the central role
and provides a standard set of APIs that apps can use to discover nearby devices, query for
GATT services, and read/write characteristics.
With the new APIs, your apps can efficiently scan for devices and services of interest. For each
device, you can check for supported GATT services by UUID and manage connections by
device ID and signal strength. You can connect to a GATT server hosted on the device and read
or write characteristics, or register a listener to receive notifications whenever those
characteristics change.
You can implement support for any GATT profile. You can read or write standard characteristics
or add support for custom characteristics as needed. Your app can function as either client or
server and can transmit and receive data in either mode. The APIs are generic, so you’ll be able
to support interactions with a variety of devices such as proximity tags, watches, fitness meters,
game controllers, remote controls, health devices, and more.
Support for Bluetooth Smart Ready is already available on Nexus 7 (2013) and Nexus 4 devices
and will be supported in a growing number of Android-compatible devices in the months ahead.
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