1.  INTRODUCTION ORIGIN OF ANDROID PLATFORM SOFTWARE DEVELOPMENT VERSIONS OF ANDROID
2.  Android is a software cluster for mobile devices that includes an operating system OS, key applications and middleware. About the design, Kernal of Android is based on Linux kernal and further furnished by Google. Android doesn’t have a essential X Window System nor does it support the full set of standard GNU libraries, which makes it difficult to port existing Linux applications or libraries to Android.
3.  Android was founded in Palo Alto, California in October 2003 by Andy Rubin , Rich Miner ,Nick Sears and Chris White who work at “Google” to develop, in Rubins words "...smarter mobile devices that are more aware of its owners location and preferences.”
4.  Android was bought by Google in 2005 On the 5th of the November 2007 the Open Handset Alliance, a consortium of several companies was unveiled with the goal to develop open standards for mobile devices.
5.  HARDWARE Android is not a single piece of hardware; its a complete, end-to-end software platform that can be adapted to work on any number of hardware configurations. Everything is there, from the boot loader all the way up to the applications
6.  OPERATING SYSTEM  Android uses Linux for its device drivers, memory management, process management, and networking.  The next level up contains the Android native libraries. They are all written in C/C++ internally, but you’ll be calling them through Java interfaces. In this layer you can find the Surface Manager, 2D and 3D graphics, Media codecs, the SQL database (SQLite), and a native web browser engine (WebKit).  Dalvik Virtual Machine. Dalvik runs dex files, which are coverted at compile time from standard class and jar files
8.  SECURITY Android is a multi-process system, in which each application (and parts of the system) runs in its own process. Most security between applications and the system is enforced at the process level through standard Linux facilities, such as user and group IDs that are assigned to applications. Additional finer-grained security features are provided through a "permission" mechanism that enforces restrictions on the specific operations that a particular process can perform, and per-URI permissions for granting ad-hoc access to specific pieces of data.
9.  PERFORMANCE
10.  FUTURE POSSIBILITIES The OHA is committed to make their vision a reality: to deploy the Android platform for every mobile operator, handset manufacturers and developers to build innovative devices Intel doesn’t want to lose ownership of the netbook market, so they need to prepare for anything, including Android More Android devices are coming and some will push the envelope even further
11.  DEVELOPMENT REQUIREMENTS Java Android SDK Eclipse IDE (optional) PROGRAMMING LANGUAGES Java – officially supported C/C++ – also possible but not supported
12.  ANDROID 1.0 Android 1.0, the first commercial version of the software, was released on September 23, 2008. HTC dream first commercially sold out mobile which runs on android on Oct 22 2008
13.  ANDROID 1.1On February 9, 2009, theAndroid 1.1 update wasreleased, initially forthe HTC Dream only.Android 1.1 was known as"Petit Four" internally,though this name was notused officially. The updateresolved bugs, changedthe API and added a numberof features
14.  ANDROID 1.5 On April 30, 2009, the Android 1.5 update was released, based on Linux kernel 2.6.27. This was the first release to officially use a name based on a dessert ("Cupcake")
15.  ANDROID 1.6 On September 15, 2009, the Android 1.6 SDK – dubbed Donut – was released, based on Linux kernel 2.6.29.
16.  ANDROID 2.0/2.1 On October 26, 2009, the Android 2.0 SDK – codenamed Eclair – was released, based on Linux kernel 2.6.29.
17.  ANDROID 2.2.x On May 20, 2010, the Android 2.2 (Froyo, short for Frozen Yogurt) SDK was released, based on Linux kernel 2.6.32.
18.  ANDROID 2.3.x On December 6, 2010, the Android 2.3 (Gingerbread) SDK was released, based on Linux kernel 2.6.35.
19.  ANDROID 3.x On February 22, 2011, the Android 3.0 (Honeycomb) SDK – the first tablet-only Android update – was released, based on Linux kernel 2.6.36. The first device featuring this version, the Motorola Xoom tablet, was released on February 24, 2011.
20.  ANDROID 4.0.x The SDK for Android 4.0.1 (Ice Cream Sandwich), based on Linux kernel 3.0.1, was publicly released on October 19, 2011.Googles Gabe Cohen stated that Android 4.0 was "theoretically compatible" with any Android 2.3.x device in production at that time. The source code for Android 4.0 became available on November 14, 2011
21.  ANDROID 4.1.x On June 27, 2012, at the Google I/O conference, Google announced Android 4.1 (Jelly Bean). Based on Linux kernel 3.0.31, Jelly Bean was an incremental update with the primary aim of improving the functionality and performance of the user interface. Nexus 7 the first device to run Jelly Bean.
22.  Android doesnt support: Bluetooth stereo Contacts exchange Modem pairing Wireless keyboards But itll work with Bluetooth headsets, but thats about it Firefox Mobile isnt coming to Android