Android How to - Do AES Encription and Description with Key

Question

We would like to know how to do AES Encription and Description with Key.
Answer

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import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

class AES {

  public static byte[] encrypt(String iv, String key, byte[] buffer)
      throws IllegalBlockSizeException, BadPaddingException,
      InvalidKeyException, InvalidAlgorithmParameterException,
      NoSuchAlgorithmException, NoSuchPaddingException {
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
    cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
    byte[] result = cipher.doFinal(buffer);
    return result;
  }

  public static byte[] decrypt(String iv, String key, byte[] buffer)
      throws NoSuchAlgorithmException, NoSuchPaddingException,
      InvalidKeyException, InvalidAlgorithmParameterException,
      IllegalBlockSizeException, BadPaddingException {
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    byte[] result = cipher.doFinal(buffer);
    return result;
  }
}