Below is my current code:
passed in "zip" is a zipped Base64 encoded string. I guess if the
string is very long(it will be since it is zipped), there will be many
gabage string created in the middle. The solution you suggested seems
doesn't eliminate this. right?

   public static String zipToString(String zip) throws Exception{
       ByteArrayInputStream in = new
ByteArrayInputStream(Base64.decode(zip));
       ZipInputStream zipIn = new ZipInputStream(in);
       zipIn.getNextEntry();

       byte[] buffer = new byte[512];

       int len;
       StringBuffer sb_result = new StringBuffer();

       while ((len = zipIn.read(buffer)) > 0) {
               sb_result.append(new String(buffer,0,len));
       }

       zipIn.closeEntry();
       zipIn.close();
       String result = sb_result.toString();
      return result;
   }