FragmentStatePagerAdapter - Reset data set

Question

This is the scenario:

• the adapter already contains data
• i need to clear the old data set and add a new one fetched from the server

The 'clear()' works removing all the items but then the adapter gets re-populated with the old fragments instead of the new ones.

Thanks in advance for helping.

public class MyFragmentAdapter extends FragmentStatePagerAdapter {
     private ArrayList<MyFragment> mFragments;
     ...
     @Override
     public Fragment getItem(int pos) {
         return mFragments.get(pos);
     }
     ...
     public void clear() {
         mFragments.clear();
         notifyDataSetChanged();
     }

     public void addItems(List<MyItem> items) {
         for(MyItem it : items) {
             mFragments.add(MyFragment.newInstance(it));
         }
         notifyDataSetChanged();
     }

     @Override
     public int getItemPosition(Object object) {
         MyFragment fi = (MyFragment) object;
         int idx = mFragments.indexOf(fi);
         if (idx >= 0) {
             return POSITION_UNCHANGED;
         } else {
             return POSITION_NONE;
         }
     }
     ...
}

---

public class MyActivity extends FragmentActivity {
    private ViewPager mPager;
    private MyFragmentAdapter mAdapter;
    ...

    private void resetItems(List<MyItem> items) {
        mAdapter.clear();
        mAdapter.addItems(items);
    }
    ...
}