android is helpful or not

1. D (OS)

2. ANDROID SYSTEM
OPERATING SYSTEM

3. TYPES OF OPERATING
SYSTEM
• CUPCAKE (1.5)
• DONUT (1.6)
• ECLAIR(2.0,2.1)
• FROYO (2.2,2.2.3)
• GINGERBREAD (2.3.2.3.7)
• HONEYCOMB (3.0,3.2.6)

4. • ICE CREAM SANDWICH (4.0.4.0.4)
• JELLY BEAN (4.1 , 4.3.1 )
• KITKAT ( 4.4 , 4.4.4, 4.4W, 4.4W.2)
• LOLLIPOP ( 5.0 , 5.1.1)
• MARSHMALLOW ( 6.0)

5. OHA (OPEN HANDSET
ALLIANCE)
o A business
alliance
consisting of
47 companies
to develop
open standards
for mobile
devices

6. OPERATING SYSTEM
• An operating system (OS) is system software that
manages computer hardware and software resources and
provides common services for computer programs. The
operating system is a component of the system software in a
computer system. Application programs usually require an
operating system to function. Time-sharing operating systems
schedule tasks for efficient use of the system and may also
include accounting software for cost allocation of processor
time, mass storage, printing, and other resources. For hardware
functions such as input and output and memory allocation, the
operating system acts as an intermediary between programs
and the computer hardware,[1][2] although the application code
is usually executed directly by the hardware and frequently
makes system calls to an OS function or is interrupted by it.
Operating systems are found on many devices that contain a

7. EXAMPLES
• Examples of popular modern operating systems
include BlackBerry, BSD, iOS, Linux (Android, Chrome
OS, Debian, Fedora, Gentoo, PCLinuxOS, RHEL ), OS
X, QNX,Steam OS, Microsoft Windows (and variant Windows
Phone),[3] and z/OS. The first seven of these examples share
roots in Unix. Popular hard real-time operating
systems include FreeRTOS, Micrium and VxWorks

8. WHAT IS AN
ANDROID
 Android is a
software stack for
mobile devices that
includes an
operating system,
middleware and key
applications.

9. PHONES
HTC G1,
Droid,
Tattoo
Motorola Droid (X)
Suno S880 Samsung Galaxy Sony Ericsson

10. TABLETS
Velocity Micro Cruz
Game FlyTouch
Acer beTouch
Dawa D7
Toshiba Android
SmartBook
Cisco Android Tablet

11. MarketShare

12. ARCHITECTURE

13. Android S/W Stack -
Application
 Android provides a set of core applications:
 Email Client
 SMS Program
 Calendar
 Maps
 Browser
 Contacts
 Etc
 All applications are written using the Java language.

14. Android S/W Stack –
App Framework (Cont)
 Features

15. Android S/W Stack -
Libraries
 Including a set of C/C++ libraries used by
components of the Android system
 Exposed to developers through the Android
application framework

16. Android S/W Stack -
Runtime
 Core Libraries
 Providing most of the functionality available in
the core libraries of the Java language
 APIs
 Data Structures
 Utilities
 File Access
 Network Access
 Graphics
 Etc

17. Android S/W Stack –
Runtime (Cont)
 Dalvik Virtual Machine
 Providing environment on which every Android
application runs
 Each Android application runs in its own process, with
its own instance of the Dalvik VM.
 Dalvik has been written such that a device can run
multiple VMs efficiently.
 Register-based virtual machine

18. Android S/W Stack –
Runtime (Cont)
 Dalvik Virtual Machine (Cont)
 Executing the Dalvik Executable (.dex) format
 .dex format is optimized for minimal memory footprint.
 Compilation
 Relying on the Linux Kernel for:
 Threading
 Low-level memory management

19. Android S/W Stack – Linux
Kernel
 Relying on Linux Kernel 2.6 for core system services
 Memory and Process Management
 Network Stack
 Driver Model
 Security
 Providing an abstraction layer between the H/W and the rest of
the S/W stack

20. THANKS
THE END