AgendaFragment agenda = new AgendaFragment();
String label = getResources().getString(R.string.title_activity_list);
FragmentTransaction ft = getFragmentManager().beginTransaction();
Bundle bundle = new Bundle();
bundle.putString("date", date);
agenda.setArguments(bundle);
ft.replace(R.id.pager, agenda, label);
ft.commit();

public class AgendaFragment extends Fragment {

    private Context mContext;
    ArrayList<String> mDate;
    Vector<List<String>> mMappedInfo;

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

        mContext = (Context) getActivity();
        mDate = new ArrayList<String>();
        mMappedInfo = new Vector<List<String>>();

        //...
        //Get necessary information from server.
        serverCommunication();
    }

    private void serverCommunication() {

        new AsyncTask<Void, Void, Boolean>() {
            //get information

            @Override
            protected void onPostExecute(Boolean result) {
                super.onPostExecute(result);

                if (result) {
                    //parse data
                    apptXmlParsing(mCompleteXml);
                }

            }

        }.execute();

    }

    public void apptXmlParsing(final XmlDom completeXml) {
        //Parse received data
        populateListView();
    }

    private void populateListView(){

        final ExpandableListView eLV = (ExpandableListView) getActivity().findViewById(R.id.expListView);

        //process data into acceptable format

        ExpandableListAdapter listAdapter = new ExpandableListAdapter(mContext, mDate, mMappedInfo, mCurrDate);
        eLV.setAdapter(listAdapter);

    }

}

public ExpandableListAdapter(Context c, List<String> mDate, ArrayList<HashMap<String, String>> mMappedInfo, List<String> mCurrDate) {
    this.context = c;
    this.mDateVariable = mDate;
    this.mMappedInfoVariable = mMappedInfo;
    this.mCurrDateVariable = mCurrDate;
}

// use the Objects with the new datas as parameters
public void loadNewData(List<String> NewmDate, ArrayList<HashMap<String, String>> NewmMappedInfo, List<String> NewmCurrDate) {
    // Then, repopulate your variables
    this.mDateVariable = NewmDate;
    this.mMappedInfoVariable = NewmMappedInfo;
    this.mCurrDateVariable = NewmCurrDate;
    // Call the method to redraw your list item
    notifyDataSetChanged();
}

listAdapter.loadNewData(mDate,mMappedInfo,mCurrDate);