I think this is what you are looking for. OnCheckedChangedListener.
RadioButton radioButton;
radioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked)
counter++;
}
});
2
solved how to increase counter on radio button is checked ? Android [closed]