Android: How to refresh online data when Internet is available without creating a new Fragment?

When my MainFragment first loads, it checks for internet connectivity. If there is internet, it loads the content from online. However, if there is no internet connectivity, I replace the existing fragment MainFragment within the container main_browse_fragment with InternetConnectivityFragment.

Within InternetConnectivtyFragment, I have a Retry button that re-checks the internet, and if there is internet connectivity, I remove InternetConnectivityFragment and call popbackstack.

The problem is, when popbackstack is called, I dont know how to reload the online data from within MainFragment. The online data loading and internet check is done within onActivityCreated of MainFragment.java, but when popbackstack is called within InternetConnectivityFragment.java, the view of MainFragment is blank

Obviously this is because the fragment is not "created" and onActivityCreated is not called again, so no data is reloaded.

Here's the relevant code:

MainFragment.java:

public class MainFragment extends DetailsFragment
{
    @Override
    public void onActivityCreated(Bundle savedInstanceState)
    {
        super.onActivityCreated(savedInstanceState);

        setupUIElements();

        if (isConnectingToInternet() == true)
        {
            // Call methods to load online data
        }
        else
        {
            InternetConnectivityFragment internetError = new InternetConnectivityFragment();

            getFragmentManager().beginTransaction().add(R.id.main_browse_fragment, internetError).commit();
        }
    }

    ...
}

InternetConnectivityFragment.java:

public class InternetConnectivityFragment extends ErrorFragment
{
    private static final String TAG = "InternetFragment";
    private static final boolean TRANSLUCENT = true;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setErrorContent();
    }

    private void setErrorContent()
    {
        setImageDrawable(getResources().getDrawable(R.drawable.lb_ic_sad_cloud, null));
        setMessage(getResources().getString(R.string.no_internet_message));
        setDefaultBackground(TRANSLUCENT);

        setButtonText(getResources().getString(R.string.retry_connection));

        setButtonClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View arg0)
            {

                if (Singleton.getInstance().isConnectedToInternet()  == true)
                {
                    getFragmentManager().beginTransaction().remove(InternetConnectivityFragment.this).commit();
                    getFragmentManager().popBackStack();

                    // How to call methods to re-load online data from MainFragment????
                }
            }
        });
    }
}

I have tried to perform the following within the onClick method:

MainFragment mainFragment = new MainFragment();

getFragmentManager().beginTransaction().remove(InternetConnectivityFragment.this).commit();
getFragmentManager().popBackStack();
getFragmentManager().beginTransaction().add(R.id.main_browse_fragment, mainFragment).commit();

However, I believe this is wrong as it just adds a new fragment MainFragment on top of an already existing fragment.

Can someone point me in the right direction?

Thanks