Every year I like to take a snapshot of the Android platforms adoption. It is great to compare Year-to-Year numbers for historical purposes. Keeping track of platform adoption is important as it directly impacts what developers should be focusing on vs. what should be deprecating or end-of-life.
Below is the Android platform comparison 2016 vs. 2015. (Search my blog for previous ones).
(Data sources: Android Developer Dashboard.)
Main adoption is driven by Lollipop (35.6% up from 9.7%), followed by KitKat (32.5% down from 38.9%). Marshmallow (API level 23) was introduced on Oct/2015 and its adoption rate is at 7.5% (May 2016).