Mobile Operating System
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presented by:
Saurabh Kumar Sinha

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Mobile Operating System
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 API’s needed for development using Java programming language.
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 Google’s Nexus.
The architecture.
consists of five software layers:
 Linux;
 Libraries;
 Runtime;
 Application Framework; and
 Applications.
 Linux—the bottom layer is the Linux OS itself—version 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 Google’s version of standard C system library
(libc), called bionic, and tuned for embedded Linux based devices.
 media and graphics libraries and
SQLite (~500kb
 Runtime—
 on top of the OS, is the Android runtime—the 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 capabilities for use by other
 Applications—
 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.
 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())
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