Referencing Fragments inside ViewPager

Question

I have a problem with referencing my Fragments inside a ViewPager. I would like to do it because from my activity I\'d like to refresh a fragment at a specified position (e.g. c

Answer 1

I managed to solve it. The trick was to make a reference list inside Activity, not PagerAdapter. It goes like this:

List> fragList = new ArrayList>();

@Override
public void onAttachFragment (Fragment fragment) {
    Log.i(TAG, "onAttachFragment: "+fragment);
    if(fragment.getClass()==EventListFragment.class){
        fragList.add(new WeakReference((EventListFragment)fragment));
    }
}
public EventListFragment getFragmentByPosition(int position) {

    EventListFragment ret = null;
    for(WeakReference ref : fragList) {
        EventListFragment f = ref.get();
        if(f != null) {
            if(f.getPosition()==position){
                ret = f;
            }
        } else { //delete from list
            fragList.remove(f);
        }
    }
    return ret;

}

Of course your fragment has to implement a getPosition() function, but I needed something like this anyway, so it wasn't a problem.

Thanks Alex Lockwood for your suggestion with WeakReference!