ViewPager in TabFragment is not loading a second time

Question

I'm trying to make an app that has a ViewPager in a Fragment that is part of a TabHost. Everything works out fine. I have my tabbar, I can switch tabs. When I switch to the tab with the ViewPager, all is shown correctly.

However, as soon as I leave this tab with the ViewPager and return this tab, my content is not shown. If I scroll to the side twice I do see my next image and if I go back two times I also see the images are loaded (probably the offscreenloaded).

See that my TabFragment is being reinstantiated when I return to it but the fragments in the ViewPager aren't.

@Override
public void onActivityCreated(Bundle savedInstanceState) {

    mProjectText = (TextView) getView().findViewById(R.id.projectText);
    mProjectText.setText(mActiveProject.getInspirationText());

    mAdapter = new AlbumAdapter(getFragmentManager(), mActiveProject.getInspiration());

    mPager = (ViewPager)getView().findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);

    super.onActivityCreated(savedInstanceState);
}

public class AlbumAdapter extends FragmentStatePagerAdapter {

private ArrayList<ProjectContent> mItems;

public AlbumAdapter(FragmentManager fm, ArrayList<ProjectContent> items) {
    super(fm);
    this.mItems = items;
}

@Override
public Fragment getItem(int position) {
    return AlbumContentFragment.newInstance(mItems.get(position));
}

@Override
public int getCount() {
    return mItems.size();
}

@Override
public int getItemPosition(Object object) {
    return POSITION_NONE;
}}

Tiedeman

Answer 1

I found the problem. It took me two days, but hey, it's fixed.

Instead of using

mAdapter = new AlbumAdapter(getFragmentManager(), mActiveProject.getInspiration());

You should use

mAdapter = new AlbumAdapter(getChildFragmentManager(), mActiveProject.getInspiration());

So much for 5 characters.

Tiedeman

Man you never know how you saved my ass tonight! – Anisole

By the way don't bother looking for something like getSupportChildFragmentManager() since getChildFragmentManager() is a method of Fragment and not of Activity... – Chen

Perfect, mate, would never have found this without your post. – Roselinerosella

It works, but second time if we open fragment, it takes 1 second of lag to display first tab listview. Any solution? – Urson

Thanks! This is because we're adding a fragment in a fragment right? But if it's in an Activity, it should be getFragmentManager()? This actually made my day man thanks – Flaggy

How did *oogle expect developers to be able to know such thing? Awful design. Anyway thank you. – Shaikh

Answer 2

I been searching this for long finally found a solution.Change your page adapter instance FragmentPagerAdapter to FragmentStatePagerAdapter example:

class PageAdapter extends FragmentStatePagerAdapter {

Anglosaxon

Than you, after FragmentPagerAdapter to FragmentStatePagerAdapter it is working. It is Simple and Short answer. – Cyclosis

Thanks. Spent to much time on this problem and your simple change worked. – Abm

OMG, it resolve me problem, but i found a problem with dynamic height of Fragment in ViewPager, my void OnMeasure can't get height of view when showing at second time. – Pliner

The correct answer is the other, but this also works. Thank you all. – Nasia

While this works, this does change how the Fragments are loaded and kept in memory. If you want the behavior of a FragmentPagerAdapter, the other solution is the right one. – Askance

Answer 3

you should use getChildFragmentManager() instead of getFragmentManager() and FragmentStatePagerAdapter() instead of FragmentPagerAdapter().Hope it will be useful for someone.

Allgood

Hey can you please explain why using FragmentStatePagerAdapter over FragmentPagerAdapter works? – Navarrette