Android version history

Global Android version distribution since December 2009. As of May 2016, Android different Android "Lollipop" versions (5.0–5.1.1), are the single most widely used Android version, operating on 35.6% of all Android devices accessing Google Play. The second is Android 4.4 "KitKat", with a share of 32.5%.^[1]

The version history of the Android mobile operating system began with the release of the Android alpha in November 2007. The first commercial version, Android 1.0, was released in September 2008. Android is continually developed by Google and the Open Handset Alliance (OHA), and has seen a number ofupdates to its base operating system since the initial release.

Versions 1.0 and 1.1 were not released under specific code names, but since April 2009's Android 1.5 "Cupcake", Android versions have had confectionery-themed code names. Each is in alphabetical order, with the most recent beingAndroid 6.0 "Marshmallow", released in October 2015.

Code name	Version number	Initial release date	API level
	1.0	September 23, 2008	1
	1.1	February 9, 2009	2
Cupcake	1.5	April 27, 2009	3
Donut	1.6	September 15, 2009	4
Eclair	2.0–2.1	October 26, 2009	5–7
Froyo	2.2–2.2.3	May 20, 2010	8
Gingerbread	2.3–2.3.7	December 6, 2010	9–10
Honeycomb[a]	3.0–3.2.6	February 22, 2011	11–13
Ice Cream Sandwich	4.0–4.0.4	October 18, 2011	14–15
Jelly Bean	4.1–4.3.1	July 9, 2012	16–18
KitKat	4.4–4.4.4, 4.4W–4.4W.2	October 31, 2013	19–20
Lollipop	5.0–5.1.1	November 12, 2014	21–22
Marshmallow	6.0–6.0.1	October 5, 2015	23
N	Developer Preview 2

Source or more:https://en.m.wikipedia.org/wiki/Android_version_history