Android MAC地址 02:00:00:00:00:00

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文章介绍了在Android 6.0及以上版本中，由于系统安全策略的变化，使用传统方法无法正确获取设备的WiFi MAC地址。文中提供了一种新的解决方案，通过检查返回的默认值并尝试从网络接口或文件系统读取真实MAC地址。

转载：http://blog.youkuaiyun.com/zhaohaiyan629/article/details/51122344

谷歌在6.0及以后版本对获取wifi及蓝牙MacAddress 做的改动。

Most notably, Local WiFi and Bluetooth MAC addresses are no longer available. The getMacAddress() method of a WifiInfo object and the BluetoothAdapter.getDefaultAdapter().getAddress() method will both return 02:00:00:00:00:00 from now on.

也就是早先的：

[java]view plaincopy 
   
print?
 WifiManager wifiManager=(WifiManager) getSystemService(Context.WIFI_SERVICE);  
 WifiInfo wifiInfo=wifiManager.getConnectionInfo();  
 String mac=wifiInfo.getMacAddress();  

方法在安卓6.0系统上获取到的Mac 都是 02:00:00:00:00:00。

在Android6.0的版本以后用原来的getMacAddress()方法获取手机的MAC地址都为：02:00:00:00:00:00这个固定的值，获取不到原来的值了，原来Android6.0对硬件信息的访问，其管控更加严格。SD 卡的读写，除了权限声明之外，还应该动态请求，否则就会被禁止。读取设备的 IMEI 也一样。

Stackoverflow上的答案，试过可行，前提是wifi开关必须打开(数据开关打开也没有用)，否则取到的结果为空，这里还是用02:00:00:00:00:00代替：

private static final String marshmallowMacAddress = "02:00:00:00:00:00";
    private static final String fileAddressMac = "/sys/class/net/wlan0/address";

    public static String recupAdresseMAC(WifiManager wifiMan) {
        WifiInfo wifiInf = wifiMan.getConnectionInfo();

        if(wifiInf.getMacAddress().equals(marshmallowMacAddress)){
            String ret = null;
            try {
                ret= getAdressMacByInterface();
                if (ret != null){
                    return ret;
                } else {
                    ret = getAddressMacByFile(wifiMan);
                    return ret;
                }
            } catch (IOException e) {
                Log.e("MobileAccess", "Erreur lecture propriete Adresse MAC");
            } catch (Exception e) {
                Log.e("MobileAcces", "Erreur lecture propriete Adresse MAC ");
            }
        } else{
            return wifiInf.getMacAddress();
        }
        return marshmallowMacAddress;
    }

    private static String getAdressMacByInterface(){
        try {
            List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
            for (NetworkInterface nif : all) {
                if (nif.getName().equalsIgnoreCase("wlan0")) {
                    byte[] macBytes = nif.getHardwareAddress();
                    if (macBytes == null) {
                        return "";
                    }

                    StringBuilder res1 = new StringBuilder();
                    for (byte b : macBytes) {
                        res1.append(String.format("%02X:",b));
                    }

                    if (res1.length() > 0) {
                        res1.deleteCharAt(res1.length() - 1);
                    }
                    return res1.toString();
                }
            }

        } catch (Exception e) {
            Log.e("MobileAcces", "Erreur lecture propriete Adresse MAC ");
        }
        return null;
    }

    private static String getAddressMacByFile(WifiManager wifiMan) throws Exception {
        String ret;
        int wifiState = wifiMan.getWifiState();

        wifiMan.setWifiEnabled(true);
        File fl = new File(fileAddressMac);
        FileInputStream fin = new FileInputStream(fl);
        ret = crunchifyGetStringFromStream(fin);
        fin.close();

        boolean enabled = WifiManager.WIFI_STATE_ENABLED == wifiState;
        wifiMan.setWifiEnabled(enabled);
        return ret;
    }

    // ConvertStreamToString() Utility - we name it as crunchifyGetStringFromStream()
    private static String crunchifyGetStringFromStream(InputStream crunchifyStream) throws IOException {
        if (crunchifyStream != null) {
            Writer crunchifyWriter = new StringWriter();

            char[] crunchifyBuffer = new char[2048];
            try {
                Reader crunchifyReader = new BufferedReader(new InputStreamReader(crunchifyStream, "UTF-8"));
                int counter;
                while ((counter = crunchifyReader.read(crunchifyBuffer)) != -1) {
                    crunchifyWriter.write(crunchifyBuffer, 0, counter);
                }
            } finally {
                crunchifyStream.close();
            }
            return crunchifyWriter.toString();
        } else {
            return "No Contents";
        }
    }