Basic concept about android

2. A robot with a human appearance.
 Android OS is a Linux-based operating
system designed primarily for touch-screen
mobile devices such as smart-phones and
tablet computers.

3.  Android is an open source code and
permissive licensing allows the software to
be freely modified and distributed by device
manufacturers, wireless carriers and
enthusiast developers.
 Additionally, Android has a large community
of developers writing applications that
extend the functionality of devices, written
primarily in a customized version of the Java
programming language.

4.  Android's user interface is based on direct
manipulation, using touch inputs that loosely
correspond to real-world actions, like
swiping, tapping, pinching and reverse
pinching to manipulate on-screen objects.
That’s why the
devices are
called smart!

5.  Internalhardware such as accelerometers,
gyroscopes and proximity sensors are used by
some applications, for example adjusting the
screen from portrait to landscape or allowing
the user to steer a vehicle in a racing game by
rotating the device, simulating control of a
steering wheel.

6.  Android has a growing
selection of
applications, which
can be acquired by
users either through
an app store such as
Google Play or by
downloading and
installing the
application's APK
(Android file format)
file from a third-party
site.

7. Android applications run in a sandbox, an
isolated area of the system that does not have
access to the rest of the system's resources,
unless access permissions are explicitly granted
by the user when the application is installed.
 Before installing an application, the Play Store
displays all required permissions: a game may
need to save data to an SD card, for example,
but should not need to read SMS messages. After
reviewing these permissions, the user can choose
to accept or refuse them, installing the
application only if they accept.

8.  Google provides major updates, incremental
in nature, to Android every six to nine
months, which most devices are capable of
receiving online.

9.  Android updates are always named
after a sweet thing, the names of all
the updates are: cup cake, donut,
éclair, froyo (frozen yoghurt dessert),
gingerbread, honeycomb, ice-cream
sandwich and (the latest) jellybean.