What is Android OS ?


Android is a software Operating system for mobile devices that includes an operating system, middleware and key applications. The Android SDK make available the tools and APIs required to begin developing applications on the Android platform using the Java programming language.

Android OS Features

Integrated browser based on the open source WebKit engine
Optimized graphics powered by a tradition 2D graphics library; 3D graphics based on the OpenGL ES 1.0 specification (hardware acceleration optional)
SQLite for prepared data storage
  • Application framework enabling reprocess and substitute of components
  • Dalvik virtual machine optimized for mobile devices
  • Media support for common audio, video, and still image formats (MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, GIF)
  • GSM Telephony (hardware dependent)
  • Bluetooth, EDGE, 3G, and Wi-Fi (hardware dependent)
  • Camera, GPS, compass, and accelerometer (hardware dependent)
  • Rich development environment as well as a device emulator, tools for debugging, memory and performance profiling, and a plug-in for the Eclipse IDE
Applications
Android will dispatch with a set of core applications including an email client, SMS program, calendar, maps, browser, contacts, and others. All applications are printed using the Java programming language.
Android Application Framework
Developers have full right to use to the same framework APIs used by the core applications. The application architecture is designed to simplify the reuse of mechanism; any application can publish its capabilities and any other application may then make use of those capabilities. This similar mechanism allows components to be replaced by the user.
Fundamental all applications are a set of services and systems, including:
  • A prosperous and extensible set of Views that can be used to build an application, including lists, grids, text boxes, buttons, and even an embeddable web browser
  • Content Providers that allow applications to access data from other applications (such as Sms), or to share their own data
Libraries
Android contains a set of C/C++ libraries used by a variety of components of the Android system. These capabilities are showing to developers through the Android application framework. Some of the core libraries are listed below:
  • System C library - a BSD-derived functioning of the standard C system library (libc), tuned for embedded Linux-based devices
  • Media Libraries - based on Packet Video’s Open CORE; the libraries support playback and recording of many popular audio and video formats, as well as static image files, including MPEG4, H.264, MP3, AAC, AMR, JPG, and PNG
  • Surface Manager - manages access to the display subsystem and seamlessly composites 2D and 3D graphic layers from multiple applications
  • LibWebCore - a modern web browser engine which powers both the Android browser and an embeddable web view
  • SGL - the original 2D graphics engine
  • 3D libraries - an functioning based on OpenGL ES 1.0 APIs; the libraries use either hardware 3D acceleration (where available) or the included, highly optimized 3D software rasterizer
  • FreeType - bitmap and vector font rendering
  • SQLite - a influential and lightweight relational database engine available to all applications.

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