String encrypt and decrypt in android java

 public class AESUtils {  
   
   private static final byte[] keyValue =  
       new byte[]{'c', 'o', 'd', 'i', 'n', 'g', 'a', 'f', 'f', 'a', 'i', 'r', 's', 'c', 'o', 'm'};  
   
   
   public static String encrypt(String cleartext)  
       throws Exception {  
     byte[] rawKey = getRawKey();  
     byte[] result = encrypt(rawKey, cleartext.getBytes());  
     return toHex(result);  
   }  
   
   public static String decrypt(String encrypted)  
       throws Exception {  
   
     byte[] enc = toByte(encrypted);  
     byte[] result = decrypt(enc);  
     return new String(result);  
   }  
   
   private static byte[] getRawKey() throws Exception {  
     SecretKey key = new SecretKeySpec(keyValue, "AES");  
     byte[] raw = key.getEncoded();  
     return raw;  
   }  
   
   private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {  
     SecretKey skeySpec = new SecretKeySpec(raw, "AES");  
     Cipher cipher = Cipher.getInstance("AES");  
     cipher.init(Cipher.ENCRYPT_MODE, skeySpec);  
     byte[] encrypted = cipher.doFinal(clear);  
     return encrypted;  
   }  
   
   private static byte[] decrypt(byte[] encrypted)  
       throws Exception {  
     SecretKey skeySpec = new SecretKeySpec(keyValue, "AES");  
     Cipher cipher = Cipher.getInstance("AES");  
     cipher.init(Cipher.DECRYPT_MODE, skeySpec);  
     byte[] decrypted = cipher.doFinal(encrypted);  
     return decrypted;  
   }  
   
   public static byte[] toByte(String hexString) {  
     int len = hexString.length() / 2;  
     byte[] result = new byte[len];  
     for (int i = 0; i < len; i++)  
       result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),  
           16).byteValue();  
     return result;  
   }  
   
   public static String toHex(byte[] buf) {  
     if (buf == null)  
       return "";  
     StringBuffer result = new StringBuffer(2 * buf.length);  
     for (int i = 0; i < buf.length; i++) {  
       appendHex(result, buf[i]);  
     }  
     return result.toString();  
   }  
   
   private final static String HEX = "0123456789ABCDEF";  
   
   private static void appendHex(StringBuffer sb, byte b) {  
     sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));  
   }  
 }  

       String encrypted = "Your Encrypted String";  
       String decrypted = "";  
       try {  
         decrypted = AESUtils.decrypt(encrypted);  
         Log.d("TEST", "decrypted:" + decrypted);  
         tvResult.append( "\n"+decrypted);  
       } catch (Exception e) {  
         e.printStackTrace();  
       }