This TechRadar article says a recent survey of 2,173 out of Appcelerator’s 280,000 mobile platform developers shows a decline of interest over the last year in developing for Android smartphones from 86% to 78% and for Android tablets from 75% to 67%. An Appcelerator spokesman thinks that the wide variety of versions of the OS in use is turning developers away. By contrast Apple’s approach of tightly controlling the hardware and OS reduces compatibility issues at the expense of choice.