如何在Android Marshmallow中获取缺少的Wifi MAC地址？

Question

想要获得Android M上的Wifi MAC地址的Android开发人员可能遇到了以下问题：获取MAC地址的标准Android OS API返回假MAC地址（02：00：00：00：00：00）而不是真正的价值。

正常方式获得了WIFI MAC地址是如下：

final WifiManager wifiManager = (WifiManager) getApplication().getApplicationContext().getSystemService(Context.WIFI_SERVICE); 

final String wifiMACaddress = wifiManager.getConnectionInfo().getMacAddress(); 

Answer 1

解决！

的MAC地址仍然可以从路径抓起：

"/sys/class/net/" + networkInterfaceName + "/address"; 

简单地做一个文件的读取，或该文件的猫会显示了WIFI MAC地址。

网络接口名称通常是沿着“为wlan0”或“eth1的”

Answer 2

在版本的Android M的MACADDRESS将是WiFi和蓝牙“不可读”的线。 你可以得到的WiFi MACADDRESS用（的Android M预览版2）：

public static String getWifiMacAddress() { 
    try { 
     String interfaceName = "wlan0"; 
     List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces()); 
     for (NetworkInterface intf : interfaces) { 
      if (!intf.getName().equalsIgnoreCase(interfaceName)){ 
       continue; 
      } 

      byte[] mac = intf.getHardwareAddress(); 
      if (mac==null){ 
       return ""; 
      } 

      StringBuilder buf = new StringBuilder(); 
      for (byte aMac : mac) { 
       buf.append(String.format("%02X:", aMac)); 
      } 
      if (buf.length()>0) { 
       buf.deleteCharAt(buf.length() - 1); 
      } 
      return buf.toString(); 
     } 
    } catch (Exception ex) { } // for now eat exceptions 
    return ""; 
} 

（得到了这个Post这个代码）

不知怎的，我heared从“读取文件/ SYS /班/网/ “+ networkInterfaceName +”/ address“;将不会工作，因为Android N将被发布，也可以有不同的制造商像三星等差异。

希望这个代码仍然可以在以后的Android版本。

编辑：另外在Android的6发布这个作品

Answer 3

您可以从IPv6本地地址获取MAC地址。例如，IPv6地址“fe80 :: 1034：56ff：fe78：9abc”对应于MAC地址“12-34-56-78-9a-bc”。请参阅下面的代码。获取WiFi IPv6地址只需要android.permission.INTERNET。

请参阅*页面IPv6 Address，特别是关于“本地地址”fe80 ::/64的注释和关于“修改的EUI-64”的章节。

/** 
* Gets an EUI-48 MAC address from an IPv6 link-local address. 
* E.g., the IPv6 address "fe80::1034:56ff:fe78:9abc" 
* corresponds to the MAC address "12-34-56-78-9a-bc". 
* <p/> 
* See the note about "local addresses" fe80::/64 and the section about "Modified EUI-64" in 
* the Wikipedia article "IPv6 address" at https://en.wikipedia.org/wiki/IPv6_address 
* 
* @param ipv6 An Inet6Address object. 
* @return The EUI-48 MAC address as a byte array, null on error. 
*/ 
private static byte[] getMacAddressFromIpv6(final Inet6Address ipv6) 
{ 
    byte[] eui48mac = null; 

    if (ipv6 != null) { 
     /* 
     * Make sure that this is an fe80::/64 link-local address. 
     */ 
     final byte[] ipv6Bytes = ipv6.getAddress(); 
     if ((ipv6Bytes != null) && 
       (ipv6Bytes.length == 16) && 
       (ipv6Bytes[0] == (byte) 0xfe) && 
       (ipv6Bytes[1] == (byte) 0x80) && 
       (ipv6Bytes[11] == (byte) 0xff) && 
       (ipv6Bytes[12] == (byte) 0xfe)) { 
      /* 
      * Allocate a byte array for storing the EUI-48 MAC address, then fill it 
      * from the appropriate bytes of the IPv6 address. Invert the 7th bit 
      * of the first byte and discard the "ff:fe" portion of the modified 
      * EUI-64 MAC address. 
      */ 
      eui48mac = new byte[6]; 
      eui48mac[0] = (byte) (ipv6Bytes[8]^0x2); 
      eui48mac[1] = ipv6Bytes[9]; 
      eui48mac[2] = ipv6Bytes[10]; 
      eui48mac[3] = ipv6Bytes[13]; 
      eui48mac[4] = ipv6Bytes[14]; 
      eui48mac[5] = ipv6Bytes[15]; 
     } 
    } 

    return eui48mac; 
}