Why it is not possible to use ViewPager within a Fragment? It actually is
android, android-fragments, android-viewpager, commonsware
Solution
UPDATE: Since this answer was originally written, you now can have nested fragments, which means it is possible to have a `ViewPager` use fragments for pages and be in a fragment itself. This sample project demonstrates the technique.
I now return you to your regularly-scheduled answer, presented in its entirety...
Quoting myself from the book:
The simplest way to use a ViewPager is to have it page fragments in and out of the screen based on user swipes. This only works if the ViewPager itself is not contained within a fragment, as you cannot have fragments nested inside of other fragments.
Quoting Dianne Hackborn:
Nested fragments are not currently supported. Trying to put a fragment within the UI of another fragment will result in undefined and likely broken behavior.
It is perfectly possible to put a `ViewPager` inside a `Fragment`, so long as the contents of the `ViewPager` do not themselves contain fragments. Since the concrete implementations of `PagerAdapter` supplied by the Android Support package use fragments, you have to roll your own fragment-less `PagerAdapter` to put the `ViewPager` in a fragment.
I will endeavor to make this point clearer in the next edition of the book (unless you're British, in which case I'll endeavour to make this point clearer :-).
Problem
There are information that it is impossible to use `ViewPager` within a `Fragment` in many sources like "The Busy Coders Guide for Android Developers" by Mark Murphy, or posts like this on SO. I'm confused because I don't have such a problem and I successfully use `ViewPager` within my `Fragment`. The only distinction is that I instantiate a `ViewPager` not in `onCreateView()` method but in `onActivityCreated()`. And everything works perfectly fine. So the question is - may be I just don't know something and this is not recommended for some reason to make UI instantiations in `onActivityCreated()`? But again - everything works just fine. Here is the listing of the class and xml: Class: ``` public class ViewPagerFragment extends Fragment { static final int NUM_ITEMS = 2; private ViewPagerAdapter mAdapter; private ViewPager mPager; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.view_pager_fragment, container, false); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mAdapter = new ViewPagerAdapter(getFragmentManager()); mPager = (ViewPager) getView().findViewById(R.id.pager); mPager.setAdapter(mAdapter); } public static class ViewPagerAdapter extends FragmentPagerAdapter { public ViewPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int num) { if (num == 0) { return new ItemsListFragment(); } else { return new FavsListFragment(); } } @Override public int getCount() { return NUM_ITEMS; } } } ``` Layout: ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="1"/> </LinearLayout> ```