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10 Δεκ 2013 (πριν από 3 χρόνια και 11 μήνες)

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Android

is a mobile operating system
developed by Google and is based
upon the Linux kernel and GNU
software.


It was initially developed by Android
Inc. (a firm purchased by Google) and
later positioned in the Open Handset
Alliance.

What is Android?

ANDROID ARCHITECTURE

Acquisition by Google



In July 2005, Google acquired
Android, Inc., a small startup
company
based in Palo Alto,
California, USA
.


This
began rumours that Google
was planning to enter the mobile
phone market.


Devoted to advancing open
standards for mobile devices




Develop technologies that
will significantly lower the
cost of developing and
distributing mobile devices
and services

What is the Open Handset Alliance
(OHA)?





It's a consortium of several companies

Features


Handset layouts


Storage


Connectivity


Messaging


Web
browser


Java
support


Media
support


Streaming
media support


Additional hardware
support


Development
environment


Multi
-
touch


Bluetooth


Multitasking


Tethering

PLATFORM

Hardware






Android is not a single piece of hardware; it's a
complete, end
-
to
-
end software platform that can be
adapted to work on any number of hardware
configurations. Everything is there, from the bootloader
all the way up to the applications.



Operating System(s)


Android uses Linux for its device drivers, memory
management, process management, and networking.


The next level up contains the Android native libraries. They
are all written in C/C++ internally, but you’ll be calling them
through Java interfaces. In this layer you can find the Surface
Manager, 2D and 3D graphics, Media
codecs
, the SQL
database (
SQLite
), and a native web browser engine
(
WebKit
).



Network Connectivity


It supports wireless communications
using:




GSM mobile
-
phone technology



3G



Edge



802.11 Wi
-
Fi networks

Security

Android is a multi
-
process system, in which each
application (and parts of the system) runs in its own
process. Most security between applications and the
system is enforced at the process level through standard
Linux facilities, such as user and group IDs that are
assigned to applications.


Additional finer
-
grained security features are provided
through a "permission" mechanism that enforces
restrictions on the specific operations that a particular
process can perform, and per
-
URI permissions for
granting ad
-
hoc access to specific pieces of data.


Future possibilities


Google Android Sales to Overtake
iPhone

in 2012


Intel doesn’t want to lose ownership of the
netbook

market, so they need to prepare for anything,
including Android



More Android devices are coming and some will
push the envelope even further


The early feedback on developing
applications for the Android platform
was mixed
.



Issues cited include bugs, lack of
documentation, inadequate QA
infrastructure, and no public issue
-
tracking system. (Google announced
an issue tracker on 18 January 2008
.)


The Android SDK includes a
comprehensive set of development
tools
.


Google applications


Google has also participated in the
Android Market by offering several
applications for its
services.


In mid August 2010 Google launched
"Voice Actions for Android
",
an
innovative feature to its set of
applications
..


Logos:



The Android logo was designed with
the

Droid font family

made
by

Ascender
Corporation
.


VERSIONS

Platform

API Level

Distribution

Android 1.5

3

12.0%

Android 1.6

4

17.5%

Android 2.1

7

41.7%

Android 2.2

8

28.7%

ADVANTAGES OF ANDROID


Android can Run Multiple Apps at the Same Time.



Android Keeps Information Visible on Your Home
Screen.


Android Has a Better App
Market.


Android
Lets You Choose Your
Hardware.


Android Lets You Choose Your
Carrier.


Android
Lets You Change Your Settings
Faster.


Android Does Google and Social
Integration.


Android Gives You More Options to Fit Your
Budget.

Limitations

Bluetooth limitations

o
Android doesn't support:


Bluetooth stereo


Contacts exchange


Modem pairing


Wireless keyboards



But it'll work with Bluetooth headsets, but that's about it

CONCLUSION

We can only hope that the next versions
of Android have overcome the actual
limitations and that the future possibilities
became a reality.