Is it safe to use android.app.Fragment while using compatibility library <p>My new project is gonna be of API 14 min level. I'm going to use the compatibility library because it holds a lot of <a href="http://stackoverflow.com/questions/22740300/is-there-any-reason-to-use-the-support-v4-library-in-android/22740525#22740525">cool stuff</a>. Wouldn't I bump into any compatibility issues if I use <strong>android.app.Fragment</strong> instead of <strong>android.support.v4.app.Fragment</strong>? </p> <p>I don't want to use the later because I would like to use new (Honeycomb) animation framework to animate fragments transition (and to use FragmentManager from SDK), for instance. Just afraid it wouldn't work with some components from the compatibility lib where <strong>android.support.v4.app.Fragment</strong> must be used.</p>