Desejo ativar o Tethering de USB do meu aplicativo no meu dispositivo Android 4.0? O código a seguir funciona para o Android 2.2, mas não funciona para o 4.0. Alguém pode ajudar?

int USBTethering(boolean b) {
        try {
            ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            Log.d(tag, "test enable usb tethering");
            Method[] wmMethods = cm.getClass().getDeclaredMethods();
            String str = "";
            if (b)
                str = "tether";
            else
                str = "untether";
            for (Method method : wmMethods) {
                Log.d("in usb tethering method",method.getName()+"<<nn>>");
                if (method.getName().equals(str)) {
                    Log.d(tag, "gg==" + method.getName());
                    Log.d("in if", " case matches "+method.getName()+"and str is "+str);
                    try {
                        Integer code = (Integer) method.invoke(cm, "usb0");
                    //  code = (Integer) method.invoke(cm, "setting TH");
                        Log.d(tag, "code===" + code);
                        return 1;
                    } catch (IllegalArgumentException e) {
                        Log.d(tag, "eroor== gg " + e.toString());
                        e.printStackTrace();
                    } catch (IllegalAccessException e) {
                        Log.d(tag, "eroor== gg " + e.toString());
                        e.printStackTrace();
                    } catch (InvocationTargetException e) {
                        Log.d(tag, "eroor== gg " + e.toString());
                        e.printStackTrace();
                    }
                }
            }
            return 0;

                       } catch (Exception e) {
            Log.e(tag, "" + e);
            return 0;
        }

    }