1. 1. Android 1.0 Astro SDK Released: Feb, 2008 Notable Updates GPS and Bluetooth Multitasking Tight integration with Google services Apps: Amazon MP3 Store; YouTube Android Market (about 35 apps at launch)
2. 2. Android 1.5 CupCake SDK Released: April, 2009 Notable Updates Improvement of the Camera Increase in GPS Position Speed Virtual Keyboard Automatic loading of videos on YouTube and Picasa
3. 3. Android 1.6 Donut SDK Released: Sept, 2009 Notable Updates The box for quick search and voice search Indicator for battery Usage Grouping of the camera Gallery apps and shooting mode addition Text to specch language
4. 4. Android 2.0 Eclair SDK Released: Oct, 2009 Notable Updates Mobile accounts for email and contacts sychronization Bluetooth 2.1 support New user interface for the browser New functions for the calendar app
5. 5. Android 2.1 Eclair SDK Released: Jan, 2010 Notable Updates Live Wallpaper: five homescreen Speech to text added to any text field Microphone icon for voice dictation in email, text, and so on
6. 6. Android 2.2 Foryo SDK Released: May, 2010 Notable Updates Support for creating hotspots Adobe Flash 10.1 Multilingual keyboard Widget Guide addition that helps you learn the features Android
7. 7. Android 2.3 Gingerbread SDK Released: Dec, 2010 Notable Updates Interface revised for easier and faster user experience New keyboard for faster text input Selecting the text feature Integrating the internal calls
8. 8. Android 3.0 Honeycomb SDK Released: Feb, 2011 Notable Updates 3D graphics support Side by side browser tabs Dual pan modes for address book Redesigned UI include program thumbnails Video chatting with Google Talk Full screen mode photo gallery Bluetooth tethering
9. 9. Android 4.0 Ice Cream Sandwich SDK Released: Oct, 2011 Notable Updates New Font Possibility of triggering a picture with smile Adding functionality such as managing folders, bookmarks Swipe addition to hide notifications Support for Wi-Fi direct, Bluetooth, HDP
10. 10. Android 4.1 Jelly Bean SDK Released: July, 2012 Notable Updates Faster, smoother, more responsive to input Resizable Widget Google Now, Voice dictation offline Imporve Android beam Update to app improved and faster
11. 11. Android 4.4 KitKat SDK Released: Oct, 2013 Notable Updates Support for Bluetooth MAP New framework for transitions in the user interface Support for wireless printing Optimization of memory and touch screen for faster multitasking
12. 12. Android 5.0 Lollipop SDK Released: Oct, 2014 Notable Updates Completely redesigned UI called Material Notifications on the loack screen New pop-up alerts Priority mode silences less important notifications Multiple user accounts for both phones and tablets Guest Mode Screen Pinning
13. 13. Hope you enjoy this information well. Get more information about the upcoming Android M visit here: Android M: The next gen of Android OS at Google IO 2015