当API大于19时便在Android.jar中找不到inetaddressutils

InetAddress ip = inet.nextElement();
                    if (!ip.isLoopbackAddress()&& InetAddressUtils.isIPv4Address(ip.getHostAddress())){
                        return ip.getHostAddress();
                    }

解决
将”InetAddressUtils.isIPv4Address(ip.getHostAddress())”替换为”ip instanceof Inet4Address”