4 MD5Helper

package com.sd.sdactivity.utils;

import java.security.MessageDigest;

public class MD5Helper {  

 public static String encrypt(String str) {

        try {

            MessageDigest m = MessageDigest.getInstance("MD5");

            m.update(str.getBytes("UTF8"));

            byte s[] = m.digest();

   StringBuilder result = new StringBuilder();

            for (byte value : s) {

                result.append(Integer.toHexString((0x000000FF & value) | 0xFFFFFF00)

                        .substring(6));

            }  

   return result.toString();

        } catch (Exception e) {

            e.printStackTrace();

            return "";

        }

    }

}