How to use android.support.v4.app.Fragment and android.app.Fragment in one activity?

Question

Android

Good afternoon!
Can you please tell me if it is possible to use two different fragments (old and new) in the same activity?
android.support.v4.app.Fragment and android.app.Fragment

Answer 1

It is forbidden.
AppCompatActivity spawns a FragmentManager from the support library, which, in turn, can only work with Fragment from the support library.
A regular Activity spawns a FragmentManager from the SDK, which, in turn, can only work with a Fragment from the SDK.

Answer 2

Take it and try it. Who's stopping you? Use the fully qualified class name (with package) when declaring fields/variables, instead of importing, to avoid name conflicts.