Froyo is installed in more devices than any other Android build

While fragmentation still plagues Android, it is not the issue that it once was. Thanks to the large number of newly launched Android devices and the number of older models that have been upgraded, Android 2.2 is now installed on 63.9% of Android devices, up from 61.3%. That is followed by the 27.2% of Android phones carrying Android 2.1 after a 2 point drop. Still, that means more than 90% of the handsets are concentrated in just two builds, certainly not what one would call fragmentation.

Surprisingly, 3.5% of  phones running Google's open source OS are still powered by Android 1.6 while 2.7% have Android 1.5 under the hood. But what about the newer Gingerbread versions? Android 2.3 can be found on .8% of Android phones while Android 2.3.3 represents 1.7% of the outstanding handsets. The Honeycomb build, optimized for tablets, is on .2% of Android devices.

As time passes, you can expect the older builds to start dropping off in numbers and as Android users start to replace their older models with newer dual-core, 4G enabled phones, we should see the majority of Android phones running Froyo and higher. Considering the features that Android 2.2 brings to the table, it will be some time before that build starts to drop off significantly, but the percentage of devices running Eclair should drop sharply as 2011 comes to a close.

source: AndroidDevelopers

Android 2.1 and 2.2 together are installed on more than 90% of current Android devices