Refreshing cursor after on ClickMethod

I have some issues with next problem...method fillList() is populating a listview with my CustomAdapter...method is called from my MainActivity and it gets passed object from it i have to refresh my cursor after onClick method to fill list with data with different arguments public class FragmentChosenDiet extends ListFragment implements View.OnClickListener {

    Button next, previous;
    Calendar cal = Calendar.getInstance();
    int DayOfTheWeek;
    String formattedDate;
    TextView date;
    SimpleDateFormat df;
    SQLController sqlC;
    private ArrayList items;
    private CustomAdapter cAdapter;


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

        View v = inflater.inflate(R.layout.fragment_chosen_diet, container, false);

        return v;
    }

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

        //get current date
        df = new SimpleDateFormat("dd.MM.yyyy EEEE");
        formattedDate = df.format(cal.getTime());


        date = (TextView) getActivity().findViewById(R.id.Datum);
        next = (Button) getActivity().findViewById(R.id.bNext);
        previous = (Button) getActivity().findViewById(R.id.bPrevious);
        DayOfTheWeek=cal.get(Calendar.DAY_OF_WEEK);
        date.setText(formattedDate + " " + DayOfTheWeek);


        next.setOnClickListener(this);
        previous.setOnClickListener(this);

    }

filling List second argument in where clause of cursor is dayOfTheWeek from Calendar class of android

public void LoadGrid(Object obj) {
        //


DayOfTheWeek=cal.get(Calendar.DAY_OF_WEEK);
        sqlC = new SQLController(getActivity());
            sqlC.open();

this is my cursor which is getting data from my database,with selected arguments: obj.getID() which i'm getting from mainActivity and DayofTheWeek which is number of the day of the week from calendar as you can see

 DayOfTheWeek=cal.get(Calendar.DAY_OF_WEEK);
            Cursor c = sqlC.readJelovnikTable(obj.getID(),DayOfTheWeek);
            c.moveToFirst();
            if (!c.isAfterLast()) {
                do {

                    int tableID = c.getInt(c.getColumnIndex(SQLController.colJelPrehID_fk));
                    String col1Table1 = c.getString(c.getColumnIndex(SQLController.colJelvrID_fk));
                    String col2Table1 = c.getString(c.getColumnIndex(SQLController.colJelDorID_fk));


                    items.add(new Items(tableID,col1Table1,col2Table1))

                } while (c.moveToNext());
            }
            c.close();
            setListAdapter(cAdapter =new CustomAdapter(getActivity(), android.R.layout.simple_list_item_1,
                items));
        }

on Click method

    @Override
    public void onClick(View v) {

        switch(v.getId()){

i'm changing date in my onClick method and my problem is i don't know how to refresh cursor with changed Date i.e. DayOfTheWeek..so it can populate //list view with new data, i can't call again my LoadGrid() method from here because i can't pass object to it...like i said before i'm getting my object from main activity

            case R.id.bNext:
                cal.add(Calendar.DATE, 1);
                formattedDate = df.format(cal.getTime());
                DayOfTheWeek=cal.get(Calendar.DAY_OF_WEEK);
                date.setText(formattedDate + " " + DayOfTheWeek);
                cAdapter.notifyDataSetChanged();

                break;

same thing here for decreasing date

//previous date

            case R.id.bPrevious:
                cal.add(Calendar.DATE, -1);
                formattedDate = df.format(cal.getTime());
                date.setText(formattedDate + " " + cal.get(Calendar.DAY_OF_WEEK));

                break;

        }
    }

and my cursor from SQLController

 public Cursor readTable(int objID,int dayID){
    database = dbHelper.getReadableDatabase();
    String[] allColumns=new String[]{colID,col1,col2,col3,col4};
    Cursor c=database.query(Table1,allColumns,col1ID+"=? AND "+col2ID_fk+"=?",
            new String[]{String.valueOf(objID),String.valueOf(dayID)},null,null,null);
    if (c != null) {
        c.moveToFirst();
    }
    return c;
}