Android 4.1 Jellybean OS is summarized as follows: 1) It introduced Project Butter to address screen lag and smooth out touch response, animations, and performance. 2) Notifications were improved with a stacked display that is easily navigated by pinching and swiping. 3) Voice recognition was enhanced to allow offline use and download of accent models. It is also better integrated with Google Now. 4) Overall, Jellybean focused on refining the user experience through improved graphics, notifications, voice features and other minor updates rather than major new additions.

1. Android 4.1: Jellybean OS
Bijaya Maharjan, Sahan Maharjan, Subash Adhikari
Nepal College of Information Technology, Pokhara University
Balkumari, Lalitpur, Nepal
erbijayamaharjan@gmail.com
er_shnmhrjn@gmail.com
me_subash1901@yahoo.com
Abstract—Android is linux based mobile OS which is being used by popular smart phone brands like Samsung, LG, HTC, Sony
Xperia, and many other. Jellybean OS is 4.1 version of this android which was released on july,9 2012. This paper will contain
detailed study of Android 4.1: Jellybean OS. Pros and cons of jellybean. It will cover stepwise development of android OS up to
jellybean. Contrast of Jellybean from old android OS, IOS and Windows Phone OS, details review of technical background of
Jellybean OS.
Keywords— Jellybean, Android 4.1, smart phone
books, and thousands of movies. Also the estimated number
of downloads from Google play was 25 billion.
I. INTRODUCTION
Android is a linux based OS. 4.1 version of Android is
popularly known as Jellybean OS. It is claimed to be the best
android OS by google and other intellectual groups who are
working in smart phone companies like google (Nexus),
Samsung(Galaxy series), sony (Xperia), HTC(One, Wildfire
and many more). Hence we will study the good part as well as
bad part of claimed best OS. We will judge it with every
aspect. We won’t claim any OS (android OS or IOS or
windows phone OS) as best or worst.
II. ANDROID
Android is a Linux-based operating system designed
especially for Smartphone and tablets, developed by Google
combining with other Open Handset Alliance (OHA).
Android is now used in various Smartphone and tablets
developed by Samsung, LG, Google, Htc, Sony Ericson,
Motorola, etc and many other mobile companies. Initially
Android was developed by Android Inc which was later
purchased by Google in 2005 and brought up with a project
called Android Open Source Project. Android being an open
source has large communities of developers writing
applications developed primarily in java. Now apps are also
developed in other languages such as C, C++, python, java
script, flash etc. They are available to download from Google
play or other third party sites. In September 2012 there are
more than 675,000 apps and games available on Google Play
to keep users entertained, alongside millions of songs and
A. History
Android Inc. was founded in Palo Alto in October 2003.
One of the founders of Android Inc, Andy Rubin wanted to
develop smarter mobile devices that are more aware of its
owner's location and preferences. Later Google acquired
Android Inc. on August 17, 2005 and Rubin started working
with Google. At Google, the team led by Rubin developed a
mobile device platform powered by the Linux kernel. And
hence the android was developed. The first commercially
available phone to run Android was the HTC Dream, released
on October 22, 2008. Then Google collaborated with HTC to
release a first Nexus phone, Nexus One. Later on various
brands of mobiles like Samsung, LG, Motorola, Sony Ericson
etc also collaborated with Google and started producing
Android smart phones.
Version
Android
1.0
Release Date
September
23,2008
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




feature
GPS and Bluetooth (but not
stereo Bluetooth)
Multitasking
Tight integration with Google
services like Gmail, Google
Maps (with Street View), and
Google Calendar
Apps: Amazon MP3 Store;
YouTube
Android Market (about 35 apps at
launch)
No Microsoft Exchange Server;
no camcorder

2. Android
1.1
February
9,2009




Android
1.5(Cup
cake)
April 30,2009







Android
1.6(Don
ut)





Android
2.0(Eclai
r)
October
26,2009
Android
2.2(Froy
o)
May 20,2010


Universal search box (search had
been limited to the Web)
Revamped Android Market:
Browsing categories (Apps,
Games, Downloads) and filters
(Top Free, Top Paid, Just In)
Camera: Toggle between camera
and video modes; integrated
photo gallery and camera with
bulk photo deleting
SDK expands support for
gestures, voice-to-text
Android
2.3(Ging
erbread)
December
6,2010



Android
3.0(Hon
eycomb)
February
22,2011
Live wallpaper; five home
screens
Speech-to-text added to any text
field; microphone icon for voice
dictation in e-mails, texts, and so
on



Virtual onscreen keyboard
Camcorder mode for recording
(and watching) video
Stereo Bluetooth
Home screen widgets and folders
Direct upload to YouTube and
Picasa
Multiple user accounts
Exchange support; universal email inbox
Quick Contact pop-up widget to
launch communications with
friends in the address book
Search saved SMS and MMS
messages
Camera improvements include
support for flash and digital zoom
Bluetooth 2.1
Keyboard improvements:
Adaptive dictionary that includes
contact names in suggestions






Android
4.01(Ice
Cream
Sandwic
h)
October
19,2011




Android
4.1.1(Jel
ly Bean)
July 9,2012














Speedier OS
USB tethering and hot-spot
support
Android Market update: Batch
and automatic updates; installing
apps to the SD card
Adobe Flash 10.1
File uploading in the browser
Improved Microsoft Exchange
support: Security policies, global
address lookup, calendar sync,
remote wipe
Bluetooth support for voice
dialing and contact sharing









Redesigned copy/paste
WebM video compression
support
NFC (near-field communication)
support
Switch to front-facing camera
from camera app
Virtual keyboard shortcuts
3D graphics support
Side-by-side browser tabs;
private browsing
Dual-pane modes for address
book, e-mail
Redesigned UI includes program
thumbnails
Video chatting with Google Talk
Full-screen-mode photo gallery
Bluetooth tethering
Support for peripherals like
keyboards and game pads
Resizable widgets
"Pay as you go" support for 3G,
4G tablets
Various bug fixes and
enhancements
Support for virtual buttons in
addition to touch-sensitive
buttons
Create folders by dragging apps
on top of each other
A new app tray tab for thumbing
through widgets
Calendar app now supports
pinch-to-zoom
Revamped Gmail user interface
New Chrome browser syncs with
your bookmarks, saves pages
offline, supports 16 browser tabs
More keyboard error correction,
inline spell check
Customizable lock screen,
launcher
Recent applications icon
Roboto typeface
New swipe/delete behavior
Improved voice integration and
copy and paste
Face Unlock security feature
Data Usage tracking
Hide unwanted app icons
Shut down apps that are using
background data

3. I. JELLYBEAN OS
As mentioned in introductory part above Jellybean OS is
android 4.1 version. This version of OS is successor of
Android of android 4.0: ice-cream sandwich. There is not
much different between ICS and jellybean. There is highest
degree of advancement in notification displays, probably the
best among the entire smart phone OS. Google also have
advanced its graphical interface with much clarity using Vsync and Triple Buffer. Google have also made android to
compete Apple’s Siri which was introduced in apple 4s by
introducing advance google now application. In spite of these
advancement users won’t feel much change from ICS in speed
and browsing capability and camera except jellybean have
filmstrip show while taking photos. Hence google have
introduced just a 0.1 increased version of 4(ICS).
A. Project Butter
Google has been organizing Google I/O conference
annually. Likewise in 27, July 2012, google’s Project Butter
was intended to address one of the major complaints that
Android users had with their devices. The irritant that is
screen lag. Majorly when using the touch interface. [1] Actually
this project was intended to drive android OS up to 5 version
but to complement the gap of 4 and 5 version google
introduced 4.1. project butter have made android in competing
IOS and Windows Phone OS, since by upgrading touch
Sensitivity, smooth animation, advanced security system and
many more.
B. Notification
Jellybeans have comfortable stacked notification display.
All the notifications are stacked with uppermost expanded.
Each notification can be zoomed by just a pinch. These
notifications are directly connected to web through things like
Google Now. Screenshots and videos also can be easily shared
using android beam, messages and google music. For closing
these notification is also simpler by just swiping them away.
These features probably make best notification display among
all smartphones.
C. Voice Recognition/voice typing
Previously, voice recognition was depended upon web,
which was disabled during absence of internet and process is
slow as well. This time we can use voice recognition while
staying offline. Another good feature is that we can download
voice recognizing driver according to accent. It is not good as
online recognition but very much useful and probably third
party will take greater advantage of it. Another good feature
is that it has been directly connected to mobile search engine
apps like google now, knowledge graph which will help in
finding short meanings and definitions of words. We can use
voice recognition to type.
D. Google Now
Google now is search engine in jellybean which can be
driven by voice very easily. Moreover google assures user
second
guess
will
be
success
try.
Another facility is that it will give you info of previously
searches. It will give you information like arriving trains buses,
delay of plane, nearest and good restaurant etc. Also it uses
knowledge graph to give general knowledge like if we ask
―who is the present president of Nepal?‖ then handset will
answer ―Dr. Ram Baran Yadav‖.
E. Magic widget
Google have made widgets in jellybean resizeable
volunterily or non-volunterily, which makes easy and
accessibility to widgets magical.
F. Gesture Mode
Google have made gesture mode more advanced that blind
people can use the mobile easily. Also extended Braille
keyboard and keyboard maps can be downloaded. Text
traversal is easy while reading ebooks and as well as browsing
internet.
G. Android Beam
Android beam is simply and NFC-based app in android os
which helps in sharing your snaps, songs, videos easily.
Instantly pair your phone or tablet to Bluetooth® devices like
headsets or speakers that support the Simple Secure Pairing
standard by just tapping them together.[2]
H. Browser
Google have used different advanced tool to make
browsing easy. It has used HTML5, CSS3, Canvas Animation
Kit
Environment
(CAKE)
and
Javascript Engine (V8). A combination of all these tools,
browsing is very fast and has smooth animation. We can now
use vertical text (Glyphs) for typing while browsing. Jellybean
also have special property of updating apps. In jellybean
process of updating app is just to download few component of
that app un like downloading whole app, which makes easy
and fast in updating.
I. Display and Animation
For smooth display and animation google have used
Vertical synchronization (Vsync) and triple buffering. Vsync
is system of responding graphics signal in vertical change (0
to 1 and vice-versa). Triple buffering is advanced way of
responding and handling 3 signals in one time. In triple
buffering the program has two back buffers and can
immediately start drawing in the one that is not involved in
such copying. The third buffer, the front buffer, is read by the
graphics card to display the image on the monitor. Once the
monitor has been drawn, the front buffer is flipped with (or
copied from) the back buffer holding the last complete
screen.[3]
J. WiFi service discovery system
Android 4.1 supports for multicast DNS-based service
discovery, which lets mobile application to find services
offered by peer devices. Helps in peer-to-peer connection due

4. to which apps discovers and pairs directly to high-bandwidth.
Apps can initiate discovery for a specific service and filter the
list of discovered devices to those that actually support the
target service application.
For example, this means that your app could discover only
devices that are ―printers‖ or that have a specific game
available, instead of discovering all nearby Wi-Fi Direct
devices. On the other hand, your app can advertise the service
it provides to other devices, which can discover it and then
negotiate a connection. This greatly simplifies discovery and
pairing for users and lets apps take advantage of Wi-Fi Direct
more effectively.
K. Keyboard and internationalization
Jellybean supports bidirectional text. Improved support for
Arabic and Hebrew. Vertical text is also support for Japanese
and chinese languages using glyphs. It has custom keyboard
input styles like QWERTY, QWERTZ , AZERTY, Dvorak,
Colemak, and PC styles. , Android 4.1 includes 27
international keymaps.
L. Security
Jellybean OS is claimed to be hard to be hacked. Mainly
features like Address Space Layout Randomization (ASLR)
and Data Execution Protection. ASLR lets a data to take
randomly different memory addresses and dep will defense
against information leakage. Other function like PIE(Position
Independent Executable) support, Read- only Relocation(once
stored data can be just read) and to avoid leaking of kernel
addresses function classes like dmesg_restrict and kptr
_restricted is being used.
M. Others features
1. Accessibility
In Jellybean, now blind users can use 'Gesture Mode' to
reliably navigate the UI using touch and swipe gestures in
combination with speech output. The new accessibility focus
feature, users can move a cursor between controls to maintain
a target for the next action or a source for the next navigation
event. You can double tap anywhere to launch the current
item with accessibility focus. Text traversal in accessibility
gives users more control – choose to move between pages,
paragraphs, lines, words or characters.
2. Face Unlock
Now in Jellybean, The Face unlock have been
updated and is now faster and more accurate. Users can
improve face matching accuracy by calibrating their face in
different accessories (e.g. glasses, hat). Face unlock requires
just a blink of time to verify that the user is unlocking the
device.
3. Google Play
Google Play is set of widgets and stuff
it
recommended with various content like apps, game, music,
books and movies. In my Library widget we can see recent
movies, books, music and magazines and dynamically
changes based on what you have been engaging with recently.
If we purchase from Google Play we can synced directly to
play movies, TV show apps , we can add bookmarks to
remember important imformation,and we also can hear songs
from Google play by using a queue of track, by album etc
4. Messaging
New notifications display the full text of
incoming SMS messages. When receiving an MMS, users can
view the full photo in a notification.
IV. CONTRAST OF OS
The contrast between android os, ios and windows phone os
is given in the table below:
Android
It has currently at
650,000 total
IOS
It has 225,000
total
Maps
Offline see street
view
Browser sync
Mobile
Payment
Video Chat
Chrome
It has Google
wallet.
It uses Gmail,
Google talk ,
We can’t enter
into Do Not
Disturb mode
It has AIM or
Facebook
message.
It has Nexus Q.
iphone users
reared on Street
View
Use of icloud
It doesn’t have
NFC.
It uses
FaceTime.
We can enter
Do not Disturb
mode.
It has
iMessage
Apps
Call Features
Messaging
Media
Streaming
It has AirPlay.
Windows phone
Windows Phone
currently has
100,000 apps
means terrific
NAVTEQ maps
Absent of browser
It has digital
wallet.
It uses Skype.
There is no sort of
Do Not Disturb
mode.
It has Skype,
Facebook
message.
It has SmartGlass
V. CONCLUSION
Hence we can see that android 4.1: jellybean OS is the best
android OS ever made. But it is not much different than
android 4.0: Ice-cream sandwich. Google have made it more
advanced to compete with IOS and windows phone OS. They
have shown true capability of android OS.
We can draw out the following conclusions:
pros
 Silky-smooth performance
 Improved notifications
 Chrome as default browser
 Resizable widgets
cons
 Google Now is limited
 Available on few devices
 Few tablet-friendly apps
 No built-in lost device security

5. But the main challenge of jellybean is that it won’t be used
to with or it won’t be compatible in much hardware and
software also will be hard to develop since even ICS is having
same problem.
ACKNOWLEDGEMENT
We would like to present our gratitude to college for giving
us this platform to present our skill in this android field. We
would like to thanks Prof. Er. Niranjan Khakurel for his
continuous support and encouraging us in completing this
project paper. And at last thanks to friends and families.
REFERENCES
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[2]
[3]
[4]
[5]
Open
Handset
Alliance.
Retrieved
2012-0215.http://www.android.com/whatsnew/Android - Android 4.1, Jelly
Bean.htm
"Triple Buffering: Why We Love It". AnandTech. June 26, 2009.
Retrieved 2009-07-16.R. E. Sorace, V. S. Reinhardt, and S. A.
Vaughn, ―High-speed digital-to-RF converter,‖ U.S. Patent 5 668 842,
Sept. 16, 1997.
Elgin, Ben (August 17, 2005). Bloomberg Businessweek. Bloomberg.
Archived from the original on February 24, 2011. Retrieved 2012-0220.
Cunningham, Andrew (June 27, 2012). Ars Technica. Retrieved
2012-09-15.
http://www.techradar.com/reviews/pc-mac/software/operatingsystems/android-4-1-jelly-bean-1087230/review?artc_pg=5