Versions of Android from Beginning
Android 1.5: Cupcake
Android 1.5 wasn't the first version, but versions before it don't seem to have received any codenames. It was supposed to be version 1.2, but Google decided to make it a major revision and made it 1.5 instead.
Android 1.6: Donut
Android V1.6, codenamed "Donut," was released in September 2009. It fixed reboot errors in the OS, revamped photo and video features and featured better search integration. A donut is a small ring-shaped friedcake.
Android 2.0 and 2.1: Eclairvs
Android 2.0 was released in October 2009, with a bugfix version (2.0.1) coming out in December 2009. Android 2.1 was released January of 2010.Support, flash and digital zoom for the camera, multi-touch support, live wallpapers.
Android 2.2: Froyo
Android 2.2 mainly improved speed by adopting the Javascript "just-in-time" compiler engine from Google's browser, Chrome. with USB tethering and Wi-Fi Hotspot capability
Android 2.3, 2.4: Gingerbread
Gingerbread was officially released in December 2010.On December 6th, 2010, Google officially announced the first phone with Android OS 2.3 Gingerbread.
Gingerbread supports internet calling, wireless transaction capability (if hardware is present), more than one camera, and gyroscopes and other sensors (barometers, gravimeters, and others are possible). It also features a download manager.
Android 3.0, 3.1, and 3.2: Honeycomb
Honeycomb was released in February 2011, and was rapidly followed by 3.1 and 3.2 in July and August of 2011. Honeycomb was made for tablets
Android 4.0: Ice Cream Sandwich
Ice Cream Sandwich was Google's attempt to synthesize Honeycomb, it's tablet-only platform, with its mobile platform. Released in October 2011, it featured a new design and default font, as well as the ability to monitor and limit mobile data usage and other upgrades.
Android 4.1: Jelly Bean
Jelly Bean came out in 2012. Biggest changes included Better, more interactive notifications. Jelly Bean also allows "voice typing," a built-in speech-to-text engine that does not rely on Internet or data.
Android 4.4: KitKat
Google announced that Android 4.4 would be named KitKat on September 3, 2013. KitKat's parent company, Nestlé, was fully on board with the naming of operating system and launched an advertising campaign during KitKat's release.
Android 5: Lollipop
Android 5 is called Lollipop, and it featured a brand new runtime called ART that no longer relies on the older DALVIK runtime , excellent battery life on some devices.
Android 6: Marshmallow
Android 6: Marshmallow is already out for the Nexus devices and is believed to be coming soon to all flagship devices before end of the year, and to other devices by mid 2016.
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