How to encrypt a serializable class in Android

public boolean save(YourClass pref){

boolean isSuccess = false;

try {

final File persistedFile = new File("/sdcard/sr.dat");

if(persistedFile.exists())

persistedFile.delete();

OutputStream file = new FileOutputStream(persistedFile);

BufferedOutputStream buffer = new BufferedOutputStream(file);

Cipher desCipher = getCipher(Cipher.ENCRYPT_MODE);

CipherOutputStream cos = new CipherOutputStream(buffer, desCipher);

ObjectOutputStream oos = new ObjectOutputStream(cos);

oos.writeObject(pref);

oos.flush();

oos.close();

} catch (IOException ex) {

Log.d(TAG, ex.getMessage());

isSuccess = false;

} catch (InvalidKeyException e) {

Log.d(TAG, e.getMessage());

isSuccess = false;

} catch (InvalidKeySpecException e) {

Log.d(TAG, e.getMessage());

isSuccess = false;

} catch (NoSuchAlgorithmException e) {

Log.d(TAG, e.getMessage());

isSuccess = false;

} catch (NoSuchPaddingException e) {

Log.d(TAG, e.getMessage());

isSuccess = false;

}

return isSuccess;

}

private Cipher getCipher(int opmode) throws InvalidKeyException, InvalidKeySpecException, NoSuchAlgorithmException, NoSuchPaddingException {

byte key[] = "Aruna Tennakoon".getBytes();

DESKeySpec desKeySpec = new DESKeySpec(key);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

// Create Cipher

Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

desCipher.init(opmode, secretKey);

return desCipher;

}

public Preference load(){

Preference repo = null;

try {

final File persistedFile = File("/sdcard/sr.dat");

if(!persistedFile.exists()) {

// sr is not created yet. Create one and return

return;

}

Cipher desCipher = getCipher(Cipher.DECRYPT_MODE);

FileInputStream fis = new FileInputStream(persistedFile.getAbsolutePath());

BufferedInputStream bis = new BufferedInputStream(fis);

CipherInputStream cis = new CipherInputStream(bis, desCipher);

ObjectInputStream ois = new ObjectInputStream(cis);

repo = (YourClass) ois.readObject();

ois.close();

} catch (FileNotFoundException e) {

Log.d(TAG, e.getMessage());

} catch (StreamCorruptedException e) {

Log.d(TAG, e.getMessage());

} catch (IOException e) {

Log.d(TAG, e.getMessage());

} catch (InvalidKeyException e) {

Log.d(TAG, e.getMessage());

} catch (InvalidKeySpecException e) {

Log.d(TAG, e.getMessage());

} catch (NoSuchAlgorithmException e) {

Log.d(TAG, e.getMessage());

} catch (NoSuchPaddingException e) {

Log.d(TAG, e.getMessage());

} catch (ClassNotFoundException e) {

Log.d(TAG, e.printStackTrace());

}

return repo;

}