Android上的MD5加密算法

/**
* 得到32位MD5码
*/
public static String getMD5(String str) {
StringBuffer hexString = new StringBuffer();
if (str != null && str.trim().length() != 0) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(str.getBytes());
byte[] hash = md.digest();
for (int i = 0; i < hash.length; i++) {
if ((0xff & hash[i]) < 0x10) {
hexString.append("0"
+ Integer.toHexString((0xFF & hash[i])));
} else {
hexString.append(Integer.toHexString(0xFF & hash[i]));
}
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
return hexString.toString();

}

//记得在前面加上

//mport java.security.MessageDigest; 
//import java.security.NoSuchAlgorithmException;