Question

我想在我的应用程序中以编程方式获取CID编号。我使用以下代码：

public void getCID() {

    File input = new File("/sys/class/mmc_host/mmc1");
    String cidDirectory = null;

    File[] sid = input.listFiles();

    for (int i = 0; i < sid.length; i++) {
        if (sid[i].toString().contains("mmc1:")) {
            cidDirectory = sid[i].toString();
            String SID = (String) sid[i].toString().subSequence(cidDirectory.length() - 4, cidDirectory.length());
            Log.d("MainActivity", "SID of MMC = " + SID);
        }
    }

    try {
        BufferedReader CID = new BufferedReader(new FileReader(cidDirectory + "/cid"));
        String sdCid = CID.readLine();
        mCidNo = sdCid.toString();
        Log.d("RegistrationActivity::", "CID :sdCid.length() = " + sdCid.length());

    } catch (FileNotFoundException e) {
        Log.d("RegistrationActivity::", e.getMessage());
        e.printStackTrace();
    } catch (IOException e) {
        Log.d("RegistrationActivity::", e.getMessage());
        e.printStackTrace();
    }
}

问题是CID号码的最后2位数字正在从手机变为手机。当我解码CID号时，我发现它是校验和。如何将CID号码用作唯一号码？或者我可以将任何其他字段用作SD卡唯一编号吗？

以编程方式获取SD卡的CID号

0 个答案: