FragmentPagerAdapter is not removing items (Fragments) correctly

Question

I have implemented the FragmentPagerAdapter and and using a List to hold all fragments for my ViewPager to display. On

Answer 1

Taking "the best of both worlds" (I mean the answers by @Tericky Shih and @mikepenz) we have it short and simple:

public class MyPagerAdapter extends FragmentPagerAdapter {

    public ArrayList fragments = new ArrayList();    

    ...

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        super.destroyItem(container, position, object);
        if (position >= getCount()) fm.beginTransaction().remove((Fragment) object).commit();
    }

    @Override
    public int getItemPosition(Object object) {
        if (fragments.contains(object)) return fragments.indexOf(object);
        else return POSITION_NONE;
    }
}

The main difference is that if some fragment is not changed you don't have to destroy its view and don't have to return POSITION_NONE for it. At the same time, I've encountered a situation when ViewPager was holding a reference to an item which was already destroyed, therefore the check if (fragments.contains(object)) helps to determine if that item is not needed anymore.