ViewPager NullPointerException while modifying FragmentActivity in Fragment - android-fragments

Question

I'm trying to modify an old FragmentActivity hosting a view pager with 3 listview in a Fragment.
The Fragment class has code that is similar to an Activity. In fact, when converting an existing Android application to use fragments, I though it would have been sufficient to move code from the activity's callback methods into the respective callback methods of the fragment. But it didn't work. I get a NullPointerException at the line
mViewPager.setAdapter(mAppSectionsPagerAdapter);
here is the code:
public class FragmentAllEvents extends Fragment implements ActionBar.TabListener
{
AppSectionsPagerAdapter mAppSectionsPagerAdapter;
// JSON Node names
private static final String TAG_UID = "uid";
private static final String TAG_LOGO = "logo";
private static final String TAG_POKUID = "pokuid";
static ArrayList<HashMap<String, String>> userList;
ArrayList<HashMap<String, String>> userListTotal;
HashMap<String, String> userSelected;
EventsFunctions eventsFunctions;
UserFunctions userFunctions;
/**
* The {#link ViewPager} that will display the three primary sections of the app, one at a
* time.
*/
ViewPager mViewPager;
static ListView lv;
ActionBar actionBar;
//Context context = this;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
View v = inflater.inflate(R.layout.all_events_main, container, false);
Log.e("AllEventsFragmentActivity Report", "Entering AllEventsFragments");
// Create the adapter that will return a fragment for each of the three primary sections
// of the app.
//FragmentManager fm = getSupportFragmentManager();
mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getFragmentManager());
// Set up the action bar.
actionBar = getActivity().getActionBar();
// Specify that the Home/Up button should not be enabled, since there is no hierarchical
// parent.
actionBar.setHomeButtonEnabled(true);
// Specify that we will be displaying tabs in the action bar.
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set up the ViewPager, attaching the adapter and setting up a listener for when the
// user swipes between sections.
mViewPager = (ViewPager) getActivity().findViewById(R.id.pager_main);
mViewPager.setAdapter(mAppSectionsPagerAdapter);
// Defining a listener for pageChange
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
{
[...]
});
[...]
}
In the previous version of this class I was extending FragmentAllEvents with a FragmentActivity instead of a Fragment.

Answer 1

It appears like, mViewPager is not populated and is NULL. If pager_main is in all_events_main layout, you need to use v.findViewById(R.id.pager_main)