關鍵代碼：

//從某處讀取文件public static String readString(String fp) {String str = null;try {BufferedReader in = new BufferedReader(new FileReader(fp));str = in.readLine();in.close();} catch (IOException e) {e.printStackTrace();}return str;}//將某字符轉成byte數組private static byte[] getMacBytes(String mac) {if(mac == null) return null;byte[] macBytes = new byte[6];String[] strArr = mac.split(":");if(strArr.length != 6)return null;for (int i = 0; i < strArr.length; i++) {int value = Integer.parseInt(strArr[i], 16);macBytes[i] = (byte) value;}return macBytes;}

修改處：

String mnMac = readString("/anywhere");byte[] mnBytes = getMacBytes(mnMac);// Populate NetworkInterface instances.Map<String, NetworkInterface> nis = new HashMap<>(inetMap.size());for (Map.Entry<String, List<StructIfaddrs>> e : inetMap.entrySet()) {String name = e.getKey();int index = Libcore.os.if_nametoindex(e.getKey());if (index == 0) {// This interface has gone away between getifaddrs and if_nametoindexcontinue;}NetworkInterface ni = new NetworkInterface(name, index, null);ni.displayName = name;List<InetAddress> addrs = new ArrayList<>();List<InterfaceAddress> binds = new ArrayList<>();for (StructIfaddrs ifa : e.getValue()) {if (ifa.ifa_addr != null) {addrs.add(ifa.ifa_addr);binds.add(new InterfaceAddress(ifa.ifa_addr, (Inet4Address) ifa.ifa_broadaddr,ifa.ifa_netmask));}if (ifa.hwaddr != null) {ni.hardwareAddr = ifa.hwaddr;if(ni.displayName.equals("wlan0") || ni.displayName.equals("wlan1") || ni.displayName.equals("p2p0")){if(mnBytes != null)ni.hardwareAddr = mnBytes;}}}ni.addrs = addrs.toArray(new InetAddress[addrs.size()]);ni.bindings = binds.toArray(new InterfaceAddress[binds.size()]);ni.childs = new ArrayList<>(0);nis.put(name, ni);}

效果：

在某處定義一個mac；

?在設置中查看mac：

?

?

總結

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