Android獲取mac地址方法，6.0以上也可用

許多Android設備的應用獲取服務器資源時，需要先將本機的mac地址在服務器端註冊，如電視機盒子，手機的部分應用，這裏記錄一下開發中自己使用的獲取mac地址的方法。

 /**
     * 獲取手機的MAC地址
     * @return String
     */
    public String getMac(){
        String str="";
        String macSerial="";
        try {
            Process pp = Runtime.getRuntime().exec(
                    "cat /sys/class/net/wlan0/address ");
            InputStreamReader ir = new InputStreamReader(pp.getInputStream());
            LineNumberReader input = new LineNumberReader(ir);

            for (; null != str;) {
                str = input.readLine();
                if (str != null) {
                    macSerial = str.trim();// 去空格
                    break;
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        if (macSerial == null || "".equals(macSerial)) {
            try {
                return loadFileAsString("/sys/class/net/eth0/address")
                        .toUpperCase().substring(0, 17);
            } catch (Exception e) {
                e.printStackTrace();

            }

        }
        return macSerial;
    }
    public static String loadFileAsString(String fileName) throws Exception {
        FileReader reader = new FileReader(fileName);
        String text = loadReaderAsString(reader);
        reader.close();
        return text;
    }
    public static String loadReaderAsString(Reader reader) throws Exception {
        StringBuilder builder = new StringBuilder();
        char[] buffer = new char[4096];
        int readLength = reader.read(buffer);
        while (readLength >= 0) {
            builder.append(buffer, 0, readLength);
            readLength = reader.read(buffer);
        }
        return builder.toString();
    }