在Android中獲取MAC地址可以通過以下幾種方法：

1. 使用WifiManager獲取MAC地址：

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
String macAddress = wifiManager.getConnectionInfo().getMacAddress();

2. 使用NetworkInterface獲取MAC地址：

try {
    List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
    for (NetworkInterface intf : interfaces) {
        if (intf.getName().equalsIgnoreCase("wlan0")) {
            byte[] mac = intf.getHardwareAddress();
            if (mac == null) {
                macAddress = "";
            } else {
                StringBuilder buf = new StringBuilder();
                for (byte aMac : mac) {
                    buf.append(String.format("%02X:", aMac));
                }
                if (buf.length() > 0) {
                    buf.deleteCharAt(buf.length() - 1);
                }
                macAddress = buf.toString();
            }
            break;
        }
    }
} catch (SocketException e) {
    e.printStackTrace();
}

請注意，獲取MAC地址可能需要權限，如ACCESS_WIFI_STATE和INTERNET。另外，Android 6.0及以上版本需要動態請求權限。