android.support.v4.app.FragmentManager OR android.app.FragmentManager?

Question

I\'m learning Android development. I get stuck at something that should be very easy.

Im creating an App with one Activity, 2 fragments and 1 interface.

Answer 1

First of all: your activity should extend FragmentActivity.

About support libraries. They were introduced to add some functionalities to older Androids. For example Fragments were introduced in Android 3.0 (SDK nr: 11). In fact (according to documentation) in Androids 3.0 < support libary uses system implementation of Fragments.