Android String 轉 MD5

 /**
* 將字符串轉成16 位MD5值
*
* @param string
* @return
*/
public static String MD5(String string) {
byte[] hash;
try {
hash = MessageDigest.getInstance("MD5").digest(
string.getBytes("UTF-8"));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}

StringBuilder hex = new StringBuilder(hash.length * 2);
for (byte b : hash) {
if ((b & 0xFF) < 0x10)
hex.append("0");
hex.append(Integer.toHexString(b & 0xFF));

}

return hex.toString();// 32位

return hex.toString().toString().substring(8, 24);// 16位
}