如何将md5运用在android进行加密

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/*
* MD5加密
*/
private String getMD5Str(String str) {
MessageDigest messageDigest = null;

try {
messageDigest = MessageDigest.getInstance("MD5");

messageDigest.reset();

messageDigest.update(str.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
System.out.println("NoSuchAlgorithmException caught!");
System.exit(-1);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}

byte[] byteArray = messageDigest.digest();

StringBuffer md5StrBuff = new StringBuffer();

for (int i = 0; i < byteArray.length; i++) {
if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
else
md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
}
//16位加密，从第9位到25位
return md5StrBuff.substring(8, 24).toString().toUpperCase();
}