android 字符串MD5加密

许多时候会在程序中用到MD5加密，下面我就共享下我的MD5加密：

public static String Md5(String plainText) {
StringBuffer buf = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return buf.toString();
}