hide and show check box issue in android

i have a check box in list view to select items and i have one button outside the list view initially the check box should be hide, when i click that button check box should display in list view and vice versa .i have one issue in that,when i press the button initially it display one checkbox and again i press the button it show few check box but what i want was initially it should be invisible when i press the button it should be visible in list view Note:i have a button in class and checkbox in adapter

    sdel.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {



                ((datalist) mlistView.getAdapter()). toggleChecks();
                ((datalist)mlistView.getAdapter()).notifyDataSetChanged();


        }

    });        

   public void toggleChecks() {

        for (int i = 0;i<sms.size();i++) {

            holder.cb.setVisibility(CheckBox.VISIBLE);



        }  isCheckBoxVisible=!isCheckBoxVisible;


      notifyDataSetChanged();
    }