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The answer would be Andorid Jelly Bean. So far Ginger bread was at the lead as of most commonly used andorid OS versionand now Jelly bean has taken the sword. Jelly Bean covers 32.3 percent share among the versions of Andorid OS. It is expected that Jelly Bean would reach 50 percent usage within the end of year
Google makes this information available for developers every month. They use a different method to determine what devices are in active use by only counting devices that access Google Play, which would be highly relevant to Android developers. As a result, these numbers are slighly different from those in the earlier post. Using the Google Play count method, 2.3 Gingerbread remains the most common Android version, although just barely at 34.1% of devices that visited Google Play last month, with Jelly Bean coming in 2nd at 32.3%.
What a timely question! As I wrote just four days ago over at CITEworld:
"For the first time ever, Jelly Bean is now the most widely used version of Android, running on 37.9% of devices powered by Google's mobile OS. It's the first time Jelly Bean (Android 4.1.x, 4.2.x), which was released almost exactly one year ago, surpassed Gingerbread (2.3.3-2.3.7), which now runs on 34.1% of active Android devices. In third place is Ice Cream Sandwich (4.0) at 23.3%."
Jelly Bean will remain the most widely distributed version of Android through at least this year and maybe next, depending on when Android 5.0 (Key Lime Pie) will be released. The latest rumor is that will happen in October. By then, Jelly Bean could be close to 50%.