Check Checkbox getting from arrayadapter

I have list of title-checkbox, and i want to have controll which one will be checked on default. So I'm trying to get the right view and check it, but for some reason it doesn't work. any idea why?

form_checkbox_item.xml

<?xml version="1.0" encoding="utf-8"?>

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<CheckBox
    android:id="@+id/checkBox1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="40dp"
    android:textColor="@color/background_red"
    android:padding="12dp"
    />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:text="TextView"
    android:textColor="@color/background_red"
    android:textSize="18sp" />

CheckboxAdapter.java

package com.rgis.datacollection.ui.adapters;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

import com.rgis.datacollection.R;

import java.util.List;

public class CheckboxAdapter extends ArrayAdapter
{
    Context context;
    List<String> checkboxItems;
public CheckboxAdapter(Context context, List<String> resource)
{
    super(context, R.layout.form_checkbox_item ,resource);

    this.context = context;
    this.checkboxItems = resource;
}

public View getView(int position, View convertView, ViewGroup parent)
{

    LayoutInflater inflater = ((Activity)context).getLayoutInflater();
    convertView = inflater.inflate(R.layout.form_checkbox_item, parent, false);
    TextView textView = (TextView) convertView.findViewById(R.id.textView1);
    CheckBox cb = (CheckBox) convertView.findViewById(R.id.checkBox1);

    textView.setText(checkboxItems.get(position));
    return convertView;
}

}

part of formCheckBox.java

        formItem = (LinearLayout) linflater.inflate(R.layout.checkbox_layout, null);
    listView = (ListView) formItem.findViewById(R.id.checkboxList);
    stringList = dbUtils.getServiceConfigForFixedOptions(attribute.getListValues());
    CheckboxAdapter checkboxAdapter = new CheckboxAdapter(context, stringList);
    listView.setAdapter(checkboxAdapter);

    CheckBox cb = (CheckBox) checkboxAdapter.getView(0, null, listView).findViewById(R.id.checkBox1);
    cb.setChecked(true);