Reset counter after button click

In DeleteTask, I have a button used to delete the list which checkbox is checked.

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

                int itemCount = listview.getCount();
                for (int i = itemCount - 1; i >= 0; i--) {
                    SearchList search = adapter.getItem(i);
                    if (search.isSelected()) {
                        adapter.removeItem(i);
                        delete.setText("DELETE");
                        counter=0;
                    }
                }
            }
        });

In DeleteAdapter, it has a counter used to count the checked box and display the counter in button. Once the button is clicked, the counter will reset to 0 and only shows DELETE in button setText.

 holder.ckbox.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (((CheckBox) v).isChecked()) {
                        int getPosition = (Integer) v.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                        search.get(getPosition).setSelected(((CheckBox)v).isChecked()); // Set the value of checkbox to maintain its state.
                        checkBoxCounter ++;
                        delete.setText("DELETE"+""+"("+ checkBoxCounter +")");
                    } else
                    {
                        int getPosition = (Integer) v.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                        search.get(getPosition).setSelected(((CheckBox) v).isChecked()); // Set the value of checkbox to maintain its state.
                        checkBoxCounter--;
                        if (checkBoxCounter == 0) {
                            delete.setText("DELETE");
                        }
                        else {
                            delete.setText("DELETE" + "" + "(" + checkBoxCounter + ")");
                        }
                    }
                }
            });

My problem now is when the delete button is clicked, it show 'DELETE', but when I check the checkBox, the counter did not reset. How to reset the counter ?