Display fragment viewpager within a fragment

I have a fragment which contains a ViewPager. The ViewPager is associated with an adapter that contains a set of fragments.

Upon loading the parent fragment, I am met with an IllegalStateException with the message: java.lang.IllegalStateException: Recursive entry to executePendingTransactions.

Some research has led me to the conclusion that the system is unable display fragments within another fragment, HOWEVER there seems to be some indication that it is possible to do exactly this with the use of a ViewPager (A bug in ViewPager using it with other fragment).

In fact, if I add a button to my parent fragment which calls mPager.setAdapter(mAdapter) on my ViewPager when pressed, the ViewPager successfully loads. This is not ideal.

The issue then must be related to the fragment lifecycle. My question therefore, is this: Has anybody else found a way around this issue, and if so, how?

Is there some way to delay settings the adapter on the ViewPager until after the fragment transaction?

Here is my parent fragment code:

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    mView = inflater.inflate(R.layout.team_card_master, container, false);
    mViewPager = (ViewPager)mView.findViewById(R.id.team_card_master_view_pager);

    final Button button = (Button)mView.findViewById(R.id.load_viewpager_button);
    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            mViewPager.setAdapter(mAdapter);
            button.setVisibility(View.GONE);
        }
    });

    mAdapter = new ViewPagerAdapter(getFragmentManager());
 //     mViewPager.setAdapter(mAdapter);

    return mView;
}

And the adapter:

public class ViewPagerAdapter extends FragmentPagerAdapter {
    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        if (mCursor == null) return 0;
        else return mCursor.getCount();
    }

    @Override
    public Fragment getItem(int position) {
        Bundle b = createBundle(position, mCursor);
        return TeamCardFragment.newInstance(b);
    }
}

Solution 1:

use AsyncTask to set the adapter for viewPager. It works for me. The asyncTask is to make the original fragment complete it's transition. and then we proceed with viewPager fragments, basically to avoid recursion.

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    mView = inflater.inflate(R.layout.team_card_master, container, false);
    mViewPager = (ViewPager)mView.findViewById(R.id.team_card_master_view_pager);

    final Button button = (Button)mView.findViewById(R.id.load_viewpager_button);
    button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            mViewPager.setAdapter(mAdapter);
            button.setVisibility(View.GONE);
        }
    });

    mAdapter = new ViewPagerAdapter(getFragmentManager());
    new setAdapterTask().execute();

    return mView;
}

private class setAdapterTask extends AsyncTask<Void,Void,Void>{
      protected Void doInBackground(Void... params) {
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
                   mViewPager.setAdapter(mAdapter);
        }
}

Solution 2:

You can use FragmentStatePagerAdapter instead of FragmentPageAdapter. It will remove fragments for you.

Solution 3:

I just ran into this same problem. I had a Fragment that needed to host a ViewPager of Fragments. When I stacked another Fragment on top of my ViewPagerFragment, and then hit back, I would get an IllegalStateException. After checking the logs (when stacking a new Fragment), I found that my ViewPagerFragment would go through its lifecycle methods to stop and destroy, however its children Fragments in the the ViewPager would stay in onResume. I realized that the children Fragments should be managed by the FragmentManager for the ViewPagerFragment, not the FragmentManager of the Activity.

I understand at the time, the answers above were to get around the limitations of Fragments not being able to have children Fragments. However, now that the latest support library has support for Fragment nesting, you no longer need to hack around setting the adapter for your ViewPager, and passing getChildFragmentManager() is all you need. This has been working perfectly for me so far.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    mView = inflater.inflate(R.layout.team_card_master, container, false);
    mViewPager = (ViewPager) mView.findViewById(R.id.team_card_master_view_pager);

    mAdapter = new ViewPagerAdapter(getChildFragmentManager());
    mViewPager.setAdapter(mAdapter);

    return mView;
}