Fix crash in WiFi Settings test code.

            alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int whichButton) {

                    Editable value = input.getText();

                    try {

                        netid = Integer.parseInt(value.toString());

                    } catch (NumberFormatException e) {

                        // Invalid netid

                        e.printStackTrace();

                        return;

                    }

                    mWifiManager.disableNetwork(netid);

                    }

                    });