MD5 encryption in Android

There are a lot of materials on the Internet about MD5 encryption in Android, but the test is always different from the MD5 encryption in the website. Later I learned that the encoding method is incorrect, so I wrote one myself. Private Static final char hex_digits [] = {'0', '1', '2', '3', '4', '5', '6 ', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F '}; public static string tohexstring (byte [] B) {// string to byte stringbuilder sb = new stringbuilder (B. length * 2); For (INT I = 0; I <B. length; I ++) {sb. append (hex_digits [(B [I] & 0xf0) >>> 4]); sb. append (hex_digits [B [I] & 0x0f]);} return sb. tostring ();} Public String MD5 (string s) {try {// create MD5 hash messagedigest digest = Java. security. messagedigest. getinstance ("MD5"); Digest. update (S. getbytes (); byte messagedigest [] = digest. digest (); Return tohexstring (messagedigest);} catch (nosuchalgorithmexception e) {e. printstacktrace ();} return "";}