android mobile operating system ppt

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android is a new sdk for mobile phones and it is open source declared by Google.

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Mobile Operating System

Presented by: YOGENDRA KUMAR SAHU (2010IT071089)IT VI SEM. JABALPUR ENGG. COLLEGE

What is Android? Android is a software stack for mobile devices that includes an OS, middleware and key applications. User applications can be developed using Android SDK which supplies a host of APIs needed for development using Java programming language.IT VI SEM. JABALPUR ENGG. COLLEGE

A slice of history Google acquired Android Inc.,USA in 2005 with establishing OHA. Announced Android in 2007 and released source code. reached version 2.1 releasing Googles Nexus.

IT VI SEM. JABALPUR ENGG. COLLEGE

The architecture consists of five software layers: 1) Linux; 2) Libraries; 3) Runtime; 4) Application Framework; and 5) Applications. IT VI SEM. JABALPUR ENGG. COLLEGE

The architecture Linuxthe bottom layer is the Linux OS itselfversion 2.6.3x .This provides process and memory management, security, networking and an array of relevant device drivers. Libraries reside on top of the OS. includes Googles version of standard C system library (libc), called bionic, and tuned for embedded Linux-based devices. media SEM. JABALPUR ENGG. COLLEGE and graphics libraries and IT VI

Runtime

The architecture on top of the OS, is the Android runtimethe Dalvik VM. designed specifically for Android and is register based to conserve memory and maximize performance. separate instance of the Dalvik VM is used to execute each Android application. The underlying OS is used for memory management and multi-threading.

Application framework provides a number of services to apps implemented as Java classes. Any application can publish its IT VI SEM. JABALPUR ENGG. COLLEGE capabilities for use by other

Applications

The architecture email, SMS, calendar, contacts and Web browser. Applications are written in Java. processed with the standard Java tools with a converter being used to translate to the Dalvik VM byte codes.

SQLite: powerful and lightweight (approx.225kb) relational database engine (RDBMS). SQLite library is linked in an application program. IT VI SEM. JABALPUR ENGG. COLLEGE The library can be called dynamically.

Application development An Eclipse-based development environment is available from Google. An Android application consists of a number of resources that are bundled into an archive, an Android package. There is no single entry point to a program (like main()).IT VI SEM. JABALPUR ENGG. COLLEGE

Application development There are four types of components which are instantiated and run as required : Activities: an executable unit that performs a specific function and has a user interface. Services: no user interface and runs in the background.

Broadcast receivers: respond to system wide messages issued by other applications or the OS.IT VI SEM. JABALPUR ENGG. COLLEGE

Advantages of Dalvik Virtual Machine simple Java interpreter machine, developed to run on low-end memory mobile devices. capability to run along an application compilation enhancing the runtime performance of the applications. DRAWBACKS: none-compatibility with Java SE libraries, Java ME class libraries and Swing Java libraries.

MERITS: minimal-electrical power consumption. vast library resources. assures the open source status of Android since Android uses a Java Virtual execution environment IT developed VI SEM. JABALPUR ENGG. COLLEGE by Google.

Advantages of Dalvik Virtual Machine

IT VI SEM. JABALPUR ENGG. COLLEGE

Security and permissions Android is a multi-process system, in which each application runs in its own process. Most security at the process level through standard Linux facilities. Additional securities through permission mechanism that enforces restrictions on the specific operations that a particular process can perform. In Android security architecture no application, by default, has permission to perform any operations that would adversely impact other applications, the OS, or the user. This includes reading or writing the users private data,reading or writing another applications files, performing network access. IT VI SEM. JABALPUR ENGG. COLLEGE

http://gizmodo.com/5395801/android-20-reviewalmost-human Learn Android http://developer.android.com/guide/basics/what-isandroid.html Introduction to Android by Jason Chen who is developer advocate at Google http://www.youtube.com/watch?v=x1ZZ-R3p_w8

Interesting Android links: From Gizmodo's

IT VI SEM. JABALPUR ENGG. COLLEGE

About OHA: OHA - Open Handset Alliance a consortium of several companies including HTC,Intel,LG,Motorola,NVIDIA,Samsung,TMobile, Google and so on. Established by Google after acquiring Android Inc.,California,USA. Declared Android open source.

IT VI SEM. JABALPUR ENGG. COLLEGE

THANK YOU!IT VI SEM. JABALPUR ENGG. COLLEGE