Android 下获取MD5编码，android获取md5编码,private Stri

Android 下获取MD5编码，android获取md5编码,private Stri

private String GetMd5(String FilePath){    char hexdigits[] =    {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',            'e', 'f'};    FileInputStream fis = null;    String sString;    char str[] = new char[16 * 2];    int k = 0;    try    {        MessageDigest md = MessageDigest.getInstance("MD5");        fis = new FileInputStream(FilePath);        byte[] buffer = new byte[2048];        int length = -1;        // long s = System.currentTimeMillis();        while ((length = fis.read(buffer)) != -1)        {            md.update(buffer, 0, length);        }        byte[] b = md.digest();        for (int i = 0; i < 16; i++)        {            byte byte0 = b[i];            str[k++] = hexdigits[byte0 >>> 4 & 0xf];            str[k++] = hexdigits[byte0 & 0xf];        }        fis.close();        sString = new String(str);        return sString;    }    catch (Exception ex)    {        ex.printStackTrace();        return null;    }}