[android-developers] Android Style BarButton

I am implementing the android style barButton on my listview on the
footer part.
My ListView has a checkbox and two item fields on it.
When i check the checkbox i want to display the footer part.

I am implementing on the BaseAdapter and when the checkbox is checked
is use as:

public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.inbox_email_list_edit,
null);
holder.checkBox = (CheckBox)
convertView.findViewById(R.id.message_edit_check);
holder.fromText = (TextView)
convertView.findViewById(R.id.message_check_from);
holder.subjectText = (TextView)
convertView.findViewById(R.id.message_check_subject);
rLay =
(RelativeLayout)convertView.findViewById(R.id.MessageButtonLayout);
holder.cancelBtn =
(Button)convertView.findViewById(R.id.inbox_cancel);
holder.deleteBtn =
(Button)convertView.findViewById(R.id.inbox_delete);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}

holder.fromText.setText(list.get(position).getFrom().toString());

holder.subjectText.setText(list.get(position).getSubject().toString());
holder.checkBox.setOnCheckedChangeListener(new
OnCheckedChangeListener() {

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean
isChecked) {
if(isChecked){
Log.i("FOOTER", "I am checked");
rLay.setVisibility(View.VISIBLE); // why does this fail? or am i
doing something out of box.
Any suggestion please.

}

}
});
holder.checkBox.setChecked(checkState.get(position));

return convertView;
}

static class ViewHolder {
TextView fromText;
TextView subjectText;
CheckBox checkBox;
Button cancelBtn;
Button deleteBtn;

}

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