![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](https://image.slidesharecdn.com/androidsystemoperatingsystem-1-151231090256/85/Android-system-operating-system-1-6-320.jpg)
![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](https://image.slidesharecdn.com/androidsystemoperatingsystem-1-151231090256/85/Android-system-operating-system-1-7-320.jpg)
Android system operating system 1
- 1. D (OS)
- 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