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

checkBox_sound.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {

            varBoolSoundOn = (isChecked) ? true : false;

        }
    });

It works Perfect...