Difference between support-v4.app.fragment and app.fragment?

Question

I am new to fragments and asked a question: When I updated my SDK tool and went on to create a project (min = api8, by default), I noticed android-support-v4.jar support in my reference library.

When I expanded my class and tried to use the Fragment class, I found that there are 2. One of them is android.app.Fragment, and the other is the android.support.v4.app.Fragment file. What is the difference between the two?

Answer 1

If you are developing Android 3+, you can use app.Fragment.

However, in 3-, Fragments did not yet exist. This is where the support library comes in. It provides snippets for older versions of Android.

See also this link.