Android提供了File Encryption和Folder Encryption的API，可以使用这些API来保护用户的数据。通过使用加密技术，文件和文件夹中的数据可以被保护，只有授权的用户才能访问它们。

以下是一些示例代码来演示如何使用这些API：

1. 文件加密

使用CipherInputStream和CipherOutputStream来实现文件加密和解密。以下是一个示例代码：

public static void encryptFile(String inputPath, String outputPath, String password) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    FileInputStream inputStream = new FileInputStream(inputPath);
    FileOutputStream outputStream = new FileOutputStream(outputPath);
    SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, keySpec);
    CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);

    byte[] buffer = new byte[1024];
    int numRead = 0;
    while ((numRead = inputStream.read(buffer)) >= 0) {
        cipherOutputStream.write(buffer, 0, numRead);
    }

    cipherOutputStream.close();
    inputStream.close();
}

public static void decryptFile(String inputPath, String outputPath, String password) throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    FileInputStream inputStream = new FileInputStream(inputPath);
    FileOutputStream outputStream = new FileOutputStream(outputPath);
    SecretKeySpec keySpec = new SecretKeySpec(password.getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, keySpec);
    CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);

    byte[] buffer = new byte[1024];
    int numRead = 0;
    while ((numRead = cipherInputStream.read(buffer)) >= 0) {
        outputStream.write(buffer, 0, numRead);
    }

    outputStream.close();
    cipherInputStream.close();
}

2. 文件夹加密

使用递归方法来遍历文件夹中的所有文件，并对它们进行加密和解密。以下是一个示例代码：

public static void encryptFolder(String inputPath, String