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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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