如何在Android中实现utf-8加密/解密

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public static String encrypt(String input, String key) throws Exception {
    SecretKeySpec secretKey = generateKey(key);
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    byte[] encryptedBytes = cipher.doFinal(input.getBytes(StandardCharsets.UTF_8));
    return android.util.Base64.encodeToString(encryptedBytes, android.util.Base64.DEFAULT);
}

private static SecretKeySpec generateKey(String key) throws NoSuchAlgorithmException {
    byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
    MessageDigest sha = MessageDigest.getInstance("SHA-256");
    keyBytes = sha.digest(keyBytes);
    return new SecretKeySpec(keyBytes, "AES");
}

public static String decrypt(String encryptedInput, String key) throws Exception {
    SecretKeySpec secretKey = generateKey(key);
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    byte[] encryptedBytes = android.util.Base64.decode(encryptedInput, android.util.Base64.DEFAULT);
    byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
    return new String(decryptedBytes, StandardCharsets.UTF_8);
}

try {
    String input = "Hello, World!";
    String key = "MySecretKey";

    String encrypted = encrypt(input, key);
    String decrypted = decrypt(encrypted, key);

    System.out.println("Encrypted: " + encrypted);
    System.out.println("Decrypted: " + decrypted);
} catch (Exception e) {
    e.printStackTrace();
}