关于获取安卓手机MAC地址的问题

一.通过以下代码获取无线网卡Mac地址
public String getMacAddress(){
    return (mWifiInfo==null)?"NULL":mWifiInfo.getMacAddress();
}
1.在 android 6.0以下是可以的,也就是说6.0以上不行

   2.如果将手机wifi开关关掉,然后关机,开机后不打开wifi,是获取不到mac地址的,打开wifi后再获取,是能得到的(在android 4.4.2上测试得出的结论)

   3.只要开机后打开过wifi,再关上,还是能获取到mac地址。

二.安卓6.0该如何获取

1.也需要打开wifi才能获取到,代码如下:

private static String getAdressMacByInterface(){
    try {
        List 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;
}

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";
    }
}


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