Android系统Md5加密方法

```
private void initMd5() {
//        022114B190CA62D104DB825FAC5DED8C
//        5DBB0C2F83388AC4150F09E5E08C97B2
String s = "123";
char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
try {
byte[] btInput = s.getBytes("utf-8");
MessageDigest mdInst = MessageDigest.getInstance("MD5");
mdInst.update(btInput);
byte[] md = mdInst.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
System.out.println(new String(str));
mGetimelTv.setText(new String(str));
} catch (Exception e) {
e.printStackTrace();
}
}