how to update the display of my CheckBox items in my ListView marked as check?

Question

When I first run my app, the CheckBox items in my ListView are unchecked. In my layout.xml I have a single CheckBox above my ListView items. When that single CheckBox above my ListView is checked it should mark all the CheckBox items in my ListView as checked. My code below does not update the display of my CheckBox items in my ListView as checked but when I tried to get the boolean of each CheckBox item in my ListView by calling checkItem.isChecked() and let it display in my logcat, it returns true. Did I miss something?

package com.usjr.sss.fragment;

import java.util.ArrayList;
import com.usjr.sss.R;
import com.usjr.sss.activity.CourseFragmentActivity;
import com.usjr.sss.adapter.InfoTechAdapter;
import com.usjr.sss.adapter.SubjectDbAdapter;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.Toast;

public class InfoTechFirstYearFragment extends Fragment {

private CheckBox checkFirstYearFirstSem;
private ListView listItFirstYearFirstSem;
private ListView listItFirstYearSecondSem;
private InfoTechAdapter infoTechAdapter;

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

    return inflater.inflate(R.layout.fragment_it_first_year, container,
            false);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    Log.i("InfoTechFirstYearFragment", "onActivityCreated");

    listItFirstYearFirstSem = (ListView) getActivity().findViewById(
            R.id.listItFirstYearFirstSem);
    listItFirstYearSecondSem = (ListView) getActivity().findViewById(
            R.id.listItFirstYearSecondSem);
}

@Override
public void onStart() {
    super.onStart();
    Log.i("InfoTechFirstYearFragment", "onStart");

    SubjectDbAdapter subjectDbAdapter = new SubjectDbAdapter(getActivity());
    subjectDbAdapter.open();

    Cursor cursor = subjectDbAdapter.fetchAllSubjects();
    ArrayList<String> arrayListSubject = new ArrayList<String>();
    ArrayList<String> arrayListFirstSem = new ArrayList<String>();
    ArrayList<String> arrayListSecondSem = new ArrayList<String>();

    while (cursor.moveToNext()) {
        String subject = cursor.getString(cursor
                .getColumnIndexOrThrow(SubjectDbAdapter.SUBJECT_ID));
        arrayListSubject.add(subject);
    }// end while

    subjectDbAdapter.close();

    int index;

    /**
     * 1st yr 1st sem
     */
    for (index = 0; index < 9; index++) {
        arrayListFirstSem.add(arrayListSubject.get(index));
    }

    infoTechAdapter = new InfoTechAdapter(
            (CourseFragmentActivity) getActivity(), arrayListFirstSem);
    listItFirstYearFirstSem.setAdapter(infoTechAdapter);

    /**
     * 1st yr 2nd sem
     */
    for (index = 9; index < 18; index++) {
        arrayListSecondSem.add(arrayListSubject.get(index));
    }

    infoTechAdapter = new InfoTechAdapter(
            (CourseFragmentActivity) getActivity(), arrayListSecondSem);
    listItFirstYearSecondSem.setAdapter(infoTechAdapter);

    /**
     * MARK ALL THE CHECKBOX AS CHECKED
     */
    checkFirstYearFirstSem = (CheckBox) getActivity().findViewById(
            R.id.checkFirstYearFirstSem);
    checkFirstYearFirstSem.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (checkFirstYearFirstSem.isChecked()) {
                Toast.makeText(getActivity(), "ckecked", Toast.LENGTH_SHORT)
                        .show();
                int count = listItFirstYearFirstSem.getCount();
                for (int index = 0; index < count; index++) {

                    // View viewMy =
                    // listItFirstYearFirstSem.getChildAt(index);
                    // Object id = v.getTag();

                    View viewItem = (View) listItFirstYearFirstSem
                            .getAdapter().getView(index, getView(),
                                    listItFirstYearFirstSem);
                    CheckBox checkItem = (CheckBox) viewItem
                            .findViewById(R.id.subject);
                    checkItem.setChecked(true);

                    listItFirstYearFirstSem.setItemChecked(index, true);

                    infoTechAdapter.notifyDataSetChanged();
                    Log.i("checkItem",
                            String.valueOf(checkItem.getText().toString()));
                    Log.i("checkItem",
                            String.valueOf(checkItem.isChecked()));
                }

            } else {
                Toast.makeText(getActivity(), "unckecked",
                        Toast.LENGTH_SHORT).show();
            }// end if-else(checkFirstYearFirstSem.isChecked())
        }// end onClick
    });// end OnClickListener
}// end onStart()
}

Answer 1

I solved it myself yey!

Instead of using

View viewItem = (View) listItFirstYearFirstSem.getAdapter().getView(index, getView(), listItFirstYearFirstSem);

I used

View viewItem = listItFirstYearFirstSem.getChildAt(index);

Then

CheckBox checkItem = (CheckBox) viewMy.findViewById(R.id.subject);
checkItem.setChecked(true);