Official Description: The Support Library is a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. Compatible on devices running API 14 or later.

CommonsWare’s Notes

This library offers AsyncLayoutInflater. As the name suggests, it is designed to inflate layouts on a background thread, delivering the inflated layout to you on the main application thread. The argument is that this can remove excess work from the main application thread.

Unfortunately, AsyncLayoutInflater will conflict with things like data binding and the <fragment> tag. AsyncLayoutInflater does not seem to be especially popular.