How to get checkbox id when using dialog fragment?

Question

Java

How to get checkbox id when using dialog fragment?
here is my class MyDialog

public class MyDialog extends DialogFragment implements View.OnClickListener
{

    int idDialog;
    final String LOG = "myLogs";
    Toast toast;
    int level;// уровень игры
    int vub; // результат выбора
    LayoutInflater inflater;
    View rootView;
    RadioGroup rg;
    Spinner spin;

    static MyDialog newInstance(int num) {
        MyDialog f = new MyDialog();

        // Supply num input as an argument.
        Bundle args = new Bundle();
        args.putInt("id", num);
        f.setArguments(args);
        return f;
    }

    public interface onMyDialigEventListener {
        public void someEvent(String s);
    }

    onMyDialigEventListener categoryEventListener;

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        //this.activity = activity;
        setRetainInstance(true);

        try {
            categoryEventListener = (onMyDialigEventListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement onSomeEventListener");
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        // ставим прозрачный цвет
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

        // убираем title из окна
        getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        //getDialog().setTitle("Simple Dialog");

        idDialog = getArguments().getInt("id");

        if(idDialog==1)
        {
            rootView = inflater.inflate(R.layout.dialog_setting, container, false);
            rootView.findViewById(R.id.butok).setOnClickListener(this);
        }
        return rootView;

    }


    private RadioButton findViewById(int radioThree) {
        // TODO Auto-generated method stub
        return null;
    }

    public void onDismiss(DialogInterface dialog) {
        super.onDismiss(dialog);
        Log.d(LOG, "Dialog 1: onDismiss");
    }

    public void onCancel(DialogInterface dialog) {
        super.onCancel(dialog);
        Log.d(LOG, "Dialog 1: onCancel");
        onDismiss(dialog);
        //getActivity().finish();
    }

    @Override
    public void onClick(View view) {
        String str;
        switch (idDialog) {
            case 1:
                str="SETTING|";

   
                str=str+Integer.toString(level);
                categoryEventListener.someEvent(str);
                break;
        }

        dismiss();
    }
}

I got the button. how to get checkbox to check ischecked condition?