以太网MAC地址获得 android

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

protected InetAddress getLocalInetAddress() {
InetAddress ip = null;
try {
Enumeration<NetworkInterface> en_netInterface = NetworkInterface.getNetworkInterfaces();
while (en_netInterface.hasMoreElements()) {
NetworkInterface ni = (NetworkInterface) en_netInterface.nextElement();
Enumeration<InetAddress> en_ip = ni.getInetAddresses();
while (en_ip.hasMoreElements()) {
ip = en_ip.nextElement();
if (!ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1)
break;
else
ip = null;
}

if (ip != null) {
break;
}
}
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ip;
}

protected String getMacAddress() /* throws UnknownHostException */{
String strMacAddr = null;
try {
InetAddress ip = getLocalInetAddress();

byte[] b = NetworkInterface.getByInetAddress(ip).getHardwareAddress();
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < b.length; i++) {
if (i != 0) {
buffer.append('-');
}

String str = Integer.toHexString(b[i] & 0xFF);
buffer.append(str.length() == 1 ? 0 + str : str);
}
strMacAddr = buffer.toString().toUpperCase();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return strMacAddr;
}