How to Handle the checkbox ischecked and unchecked event in android

Question

i am new in android.i make a simple maths apps. i use the check box for select right option but problem is here the answer option is not only one but also two,three means

Answer 1

chk.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub

                      if(isChecked){
                          chetimeslot = (String)chk.getTag();
                            checkbox_timeslot.add(chetimeslot);

                        }
                       else{
                           chetimeslot = (String)chk.getTag();
                            checkbox_timeslot.remove(chetimeslot);


                       }

});