Android Adding Dynamic ListView Header

I have a list view and I am trying to set header for it so that it looks like a table header. Here is the XML file of my list view row:

PS: I have removed some codes to shorten the question

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

<TextView
    android:id="@+id/txtDisplayDate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
<TextView
    android:id="@+id/txtDisplayCat"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1" />
</LinearLayout>

And my XML file of my header list view:

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

<TextView
    android:id="@+id/txtDisplayDate"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="Date" />
<TextView
    android:id="@+id/txtDisplayCat"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:text="Category" />

And the class where I populate the list view:

private class ListAdapter extends BaseAdapter {
    LayoutInflater inflater;
    ViewHolder viewHolder;

    public ListAdapter(Context context) {
        // TODO Auto-generated constructor stub
        inflater = LayoutInflater.from(context);
        LinearLayout listHeaderView = (LinearLayout)inflater.inflate(
                R.layout.trans_header_layout, null);
        listview.addHeaderView(listHeaderView);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return _translist.size();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {     
        // TODO Auto-generated method stub
        if (convertView == null) {

            convertView = inflater.inflate(R.layout.trans_listview_row,
                    null);
            viewHolder = new ViewHolder();

            viewHolder.txt_ddate = (TextView) convertView
                    .findViewById(R.id.txtDisplayDate);
            viewHolder.txt_dcat = (TextView) convertView
                    .findViewById(R.id.txtDisplayCat);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.txt_ddate.setText(_translist.get(position).getDate()
                .trim());
        viewHolder.txt_dcat.setText(_translist.get(position)
                .getCategory().trim());
        return convertView;
    }
}

However, by using these codes, here is the output that I've gotten:

The header does not match with the column below it. I wonder is there any alternate way to add header to list view so that it looks like a table header.

Thanks in advance.