How to update All Pages in Page Viewer?

Question

I have a Page Viewer with three pages with ArrayLists in them, represented as "Tomorrow" "Today" and "Yesterday". I also have a Drawer that allows to change settings of the Lists.

When the Drawer closes, I want the ListsViews (or the entire page fragment) to update to show three new ArrayLists that were created after the new settings were applied.

So far, I managed to be able to update "Yesterday" and "Tomorrow" (When sliding to yesterday, tomorrow updates and vice versa), I think that is because "Today" never gets destroyed.

Either way, I would really like to see all three update as soon as the Drawer closes.

Here is the code for my Adapter:`

    private class MyPagerAdapter extends FragmentPagerAdapter {

    SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();
    ListFragmentOfTomorrow torrowFragment =new ListFragmentOfTomorrow();
    ListFragmentOfToday todayFragment = new ListFragmentOfToday();
    ListFragmentOfYesterday yestFragment = new ListFragmentOfYesterday();

    public MyPagerAdapter(android.support.v4.app.FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int pos)
    {
     switch (pos) {

        case 0:
            torrowFragment.newInstance(tomorrowArrayList, MainActivity.this);
            registeredFragments.put(0, torrowFragment);
            return torrowFragment;
        case 1:
            todayFragment.newInstance(todayArrayList, MainActivity.this);
            registeredFragments.put(1, todayFragment);
            return todayFragment;
        case 2:
            yestFragment.newInstance(yesterdayArrayList, MainActivity.this);
            registeredFragments.put(2, yestFragment);
            return yestFragment;
        default: 
            todayFragment.newInstance(todayArrayList, MainActivity.this);
            registeredFragments.put(3, todayFragment);
            return todayFragment;
            }
    }

    @Override
    public int getCount() {
        return 3;
    }

    public Fragment getRegisteredFragment(int position) {
        return registeredFragments.get(position);
    }
}`

This is the code for one of the page Fragment (all three are basically the same):

public class ListFragmentOfToday extends Fragment
{
static ExpandListAdapter ExpAdapter;
static ExpandableListView expndList;
static Context context;
static ArrayList<Game> todayArrayList;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle     savedInstanceState)
{
    View v = inflater.inflate(R.layout.fragment_list_of_today, container,  false);
    expndList = new ExpandableListView(context);
    expndList = (ExpandableListView)v.findViewById(R.id.FragmentedExpandableListView);
    ExpAdapter = new ExpandListAdapter(context,todayArrayList);
    expndList.setAdapter(ExpAdapter);
    return v;
}

public static ListFragmentOfToday newInstance(ArrayList<Game> todayArrayListIn, Context contextIn)
{
    ListFragmentOfToday todayFragment = new ListFragmentOfToday();
    context = contextIn;
    todayArrayList = todayArrayListIn;
    return todayFragment;
}

public void RefreshList(ArrayList<Game> todayArrayListIn)
{
    todayArrayList=todayArrayListIn;
    ExpAdapter.notifyDataSetChanged();
}
}

This is the code for when the Drawer closes:

    @Override
public void onDrawerClosed(View drawerView)
{
    //Here, the new ArrayLists are created(...)
    ListFragmentOfTomorrow tomorrowFragmentToUpdate = (ListFragmentOfTomorrow)pagerAdapter.getRegisteredFragment(0);
    tomorrowFragmentToUpdate.RefreshList(updatedTomorrowArrayList);
    ListFragmentOfToday todayFragmentToUpdate = (ListFragmentOfToday)pagerAdapter.getRegisteredFragment(1);
    todayFragmentToUpdate.RefreshList(updatedTodayArrayList);
    ListFragmentOfYesterday yesterdayFragmentToUpdate = (ListFragmentOfYesterday)pagerAdapter.getRegisteredFragment(2);
    yesterdayFragmentToUpdate.RefreshList(updatedYesterdayArrayList);
}

Question: How can I get all three pages to show the new updated arraylists as soon as the drawer closes?

As a new developer and a new StackOverflow user, I would also like to get any feedback on my code writing and my question format. Thank you.

Call notifyDataSetChanged() on the adapter. And maybe you need to override getItemPosition() like this: @Override public int getItemPosition(Object object) { return POSITION_NONE; } — Thomas R., Jun 02 '15 at 10:51
Also note [instantiating fragments](http://stackoverflow.com/questions/9245408/best-practice-for-instantiating-a-new-android-fragment). One day I'll find out who came out with all this `newInstance()` stuff and ask him/her if he/she thought this through. — dhke, Jun 02 '15 at 10:58

score 0 · Answer 1 · answered Jun 02 '15 at 11:03

0

Thank you Thomas! That worked. I tried notifyDataSetChanged() and getItemPosition(Object object), but never together. dhke - I saw the instantiating fragments when I was looking for an answer, but understood the difference to newInstance()...

answered Jun 02 '15 at 11:03

Nakab

55
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How to update All Pages in Page Viewer?

1 Answers1