Android Base64代码如下：

// 加密传入的数据是byte类型的，并非使用decode方法将原始数据转二进制，String类型的数据 使用 str.getBytes()即可
String str = "Hello!";
// 在这里使用的是encode方式，返回的是byte类型加密数据，可使用new String转为String类型
String strBase64 = new String(Base64.encode(str.getBytes(), Base64.DEFAULT));
Log.i("Test", "encode >>>" + strBase64);
        
// 这里 encodeToString 则直接将返回String类型的加密数据
String enToStr = Base64.encodeToString(str.getBytes(), Base64.DEFAULT);
Log.i("Test", "encodeToString >>> " + enToStr);
        
// 对base64加密后的数据进行解密
Log.i("Test", "decode >>>" + new String(Base64.decode(strBase64.getBytes(), Base64.DEFAULT)));

Android AES代码如下：

/**
  * @param
  * @return AES加密算法加密
  * @throws Exception
  */
 public static String encrypt(String seed, String cleartext)
   throws Exception {
  byte[] rawKey = getRawKey(seed.getBytes());
  byte[] result = encrypt(rawKey, cleartext.getBytes());
  return toHex(result);
 }
 /**
  * @param
  * @return AES加密算法加密
  * @throws Exception
  */
 private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
  SecretKeySpec 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 String toHex(byte[] buf) {
  final String HEX = "0123456789ABCDEF";
  if (buf == null)
   return "";
  StringBuffer result = new StringBuffer(2 * buf.length);
  for (int i = 0; i < buf.length; i++) {
   result.append(HEX.charAt((buf[i] >> 4) & 0x0f)).append(
     HEX.charAt(buf[i] & 0x0f));
  }
  return result.toString();
 }
 /**
  * @param raw
  * @param encrypted
  * @return AES加密算法解密
  * @throws Exception
  */
 public static String decrypt(String seed, String encrypted)
   throws Exception {
  byte[] rawKey = getRawKey(seed.getBytes());
  byte[] enc = toByte(encrypted);
  byte[] result = decrypt(rawKey, enc);
  return new String(result);
 }
 private static byte[] decrypt(byte[] raw, byte[] encrypted)
   throws Exception {
  SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
  Cipher cipher = Cipher.getInstance("AES");
  cipher.init(Cipher.DECRYPT_MODE, skeySpec);
  byte[] decrypted = cipher.doFinal(encrypted);
  return decrypted;
 }
 private 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;
 }
 private static byte[] getRawKey(byte[] seed) throws Exception {
  KeyGenerator kgen = KeyGenerator.getInstance("AES");
  SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
  sr.setSeed(seed);
  kgen.init(128, sr); // 192 and 256 bits may not be available
  SecretKey skey = kgen.generateKey();
  byte[] raw = skey.getEncoded();
  return raw;
 }

// 使用该方法
String masterPassword = "test";    
String originalText = "0123456789";  
String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);    
Log.i("加密结果为 ",encryptingCode);    
String decryptingCode = SimpleCrypto.decrypt(masterPassword, encryptingCode);  
Log.i("解密结果",decryptingCode);