DINESH KUMAR YADAVRAJKUMAR SHARMAASRAF ALI KHAN

Group Members:

ANDROID OVERVIEW

History Introduction To Android Platform Architecture Dalvik Virtual machine Features

History

Software platform from Google and the Open Handset Alliance.

July 2005, Google acquired Android

November 2007, Open Handset Alliance formed , a consortium of 86 hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices.

October 2008, Android available as open source

December 2008, 14 new members joined Android project

History Continue…..

April 30, 2009: Official 1.5 Cupcake release September 15, 2009: 1.6 SDK Donut release October 26, 2009: 2.0 SDK Éclair release

Updates to the Éclair release: 2.0.1 on December 3, 2009 2.1 on January 12, 2010

May 20,2010: 2.2 SDK Froyo release December 6,2010: 2.3 SDK Gingerbread release Feb 22,2011:3.x SDK Honeycomb release Oct 19,2011:4.x SDK Cream Sandwich release

Introduction Android

What is Android?

Android is the software platform from Google and the Open Handset Alliance that some say has the potential to revolutionize the global cell phone market.

Based on the Linux kernel.

Allows writing managed code in the Java language

Possibility to write applications in other languages and compiling it to ARM native code.

Introduction Android Continue….

What is the Open Handset Alliance (OHA)? The Open Handset Alliance is consortium of several technology companies,

including hardware manufacturers, mobile carriers, and software developers.

“A commitment to openness, a shared vision for the future, and concrete plans to make vision a reality. To accelerate innovation in mobile and offer consumers a richer, less expensive, and better mobile experience.”

Introduction Android Continue….

OHA (Open Handset Alliance)

A business alliance consisting of 47 companies to develop open standards for mobile devices

Introduction Android Continue……..

Phones

HTC G1,Droid,Tattoo

Motorola Droid (X)

Suno S880 Samsung Galaxy Sony Ericsson

Tablets

Velocity Micro Cruz Gome FlyTouch Acer beTouch

Dawa D7Toshiba Android SmartBook

Cisco Android Tablet

Platform

Linux Kernel

Native Libraries

Surface Manager 2D + 3D Graphics Open GL + Media SQL Lite Browser

Runtime + Dalvik VM Lightweight java VM + Efficient bytecode

Android Framework

Application

Architecture

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.

Android S/W Stack – App Framework

Enabling and simplifying the reuse of components Developers have full access to the same framework APIs used by the core

applications. Users are allowed to replace components

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

Android S/W Stack - Runtime

.

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:ThreadingLow-level memory management

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

Dalvik Virtual Machine

The Dalvik virtual machine is simple Java interpreter machine, completely optimized for Android

platform and which is developed to run on low-end memory mobile devices. One of the prominent

aspects in Dalvik its capability to run along an application compilation enhancing the runtime

performance of the applications. Dalvik is not exactly, a Java machine, because Dalvik could not read

Java code, but consists its own byte code called ‘dex’

Features Of Android OS

The entire Application framework can be reused and replaced by selective components

Dalvik virtual machine enhances the power management systems

Support for 2D and 3D graphics , So lot of business for animation developers.

Reliable and enhanced data storage Developers can create media common applications since it

supports common media file formats(MPEG, MPEG3, MPEG4, H.286, AAC, AMR,

JPG, PNG, GIF and more)

Features Of Android OS

GSM,3G, Wi-Fi network applications support (Depends on hardware) Open source Web-Kit Engine-based web-browser Touch-Unlock, and accelerometer applications support

(Depends on hardware) Androids development environment includes a device

emulator, debugger, performance

Query?

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