Android : managing checkbox visibility on listview onItemClick

I have listview and list_item layout contains a imageview, textview and checkbox. my adapater contains sectionheader. When I click on listview item make that checkbox visble and when I again click on that item make checkbox invisible.

        ListView lv = (ListView) findViewById(R.id.friendsList);
        lv.setFastScrollEnabled(true);
        fbAdapter = new FbFriendsAdapter(this, 0);
        lv.setAdapter(fbAdapter);
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub

                 fbAdapter.getSelectedFriend();

                 String s = (String) ((TextView) view
                 .findViewById(R.id.friendName)).getText();
                 CheckBox cb = (CheckBox) view.findViewById(R.id.iv_check);
                 cb.setVisibility(View.VISIBLE);

                 cb.setChecked(true);

                 if (cb.isChecked()) {

                     Toast.makeText(FbFriendsListActivity.this, "selected " + s,
                 Toast.LENGTH_SHORT).show();
                 }
                 else{
                     //not working when i tried . setvisibilty gone of checkbox.

                 }
             });

listitemlayout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="5dp" >

        <com.hashmash.utils.RoundedImageView
            android:id="@+id/friendPhoto"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:focusable="false"
            android:src="@drawable/fb_profileimgsm"
            android:scaleType="centerCrop"
            app:corner_radius="80dp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="30dp"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/friendName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:focusable="false"
                android:text="#Name"
                android:textColor="@color/instablue"
                android:textSize="14sp" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:gravity="right" >

                <CheckBox
                    android:id="@+id/iv_check"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:focusable="false"
                    android:visibility="visible" />
            </RelativeLayout>
        </LinearLayout>
    </LinearLayout>

</LinearLayout>