How can I show toast when all checkboxes in my recyclerview are unchecked?

The closest I can get is to show toast after each checkbox is unchecked, but I want to show toast only after they have all been unchecked. In my onBindViewHolder I have:

    ((MatchingContact) viewHolder).check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        // ((MatchingContact) viewHolder).check.setOnClickListener(new CompoundButton.OnClickListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

            if (isChecked==false) {
                Toast.makeText(context_type, "all unchecked!", Toast.LENGTH_SHORT).show();


            }

        }
    });