Does it make sense to use the android.support.v4.app library?

Question

Java

Good!
Here I am learning to develop for android, I use android.support.v4 everywhere, but I even looked that it is below 3 for android. Does it make sense?
In my project I plan to support the current android from the 4th version

Answer 1

Support library for all android versions. It is needed to provide the same set of features at all levels of the API. In addition, it is updated much more often than system libraries. "Google considers use of the support libraries a best practice, even if not necessarily required." - as they write in smart books.