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The version history of the Android mobile operating system began with the release of the Android beta in November 2007.

The first commercial version, Android 1.0, was released in September 2008.

Android is under ongoing development by Google and the Open Handset Alliance, and has seen a number of updates to its base operating system since its original release. These updates typically fix bugs and add new features.

Since April 2009, Android versions have been developed under a codename and released in alphabetical order: Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich (ICS), and Jelly Bean. As of 2012, over 400 million active devices use the Android OS worldwide. The most recent major Android update was Lollipop5.0. which was released in October 2014. All versions have been released in alphabetical order.

Version	-Name-	Date
1.0	Apple pie	November 11, 2007
1.1	Bananas split	October 22, 2008
1.5	Cupcake	April 30, 2009
1.6	Donut	September 15,2009
2.0/2.1	Eclair	October 26, 2009
2.2.x/2.2.3	FroYo (Frozen Yogourt)	May 20, 2010
2.3.x/2.3.7	Gingerbread	December 6, 2010
3.x.x/3.2	Honeycomb	February 22, 2011
4.0.x/4.0.4	Ice Cream Sandwich	October 19, 2011
4.1.x/4.3.1	Jelly Bean	July 9, 2012
4.4.x/4.4.4	KitKat	October 31, 2013
5.0.x	Lollipop	November 03, 2014
6.0.x	Marshmallow	October 05, 2015
7.0.x	Nougat	August 22, 2016
8.0.x	Oreo	August 21, 2017
9.0.x	Pie	August 06, 2018
10.0.x	Android 10	September 03, 2019
11.0.x	Android 11	September 08, 2020
12.0.x	Android 12	To be announced
GO edition	Android 8.1+9+10+11	Dec 05, 2017 2018 2019 2020 ...

Android Go, officially Android Go Edition, is a stripped-down version of Android distribution designed for low-end and ultra-budget smartphones, first made available for Android Oreo.

Android One is a family of third-party Android smartphones promoted by Google. In comparison to many third-party Android devices, which ship with a manufacturer's customized user interface and bundled apps, these devices run near-stock versions of Android with limited modifications, and a focus on Google services (although they may still feature software enhancements to support the features of included hardware, such as cameras). Android One devices receive OS updates for at least two years after their release, and security patches for at least three years.

Here are some links :

Android Wiki
Acer Iconia Tab Wiki
Acer Iconia Tab A500 Forum
Index of Android-Os related articles

 

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