public class ObscuredPrefsActivity extends OakDemoActivity {

    private static final String MY_APP_PREFENCES_NAME = "my_app_prefences_name";

    private SharedPreferences mNormalSharedPreferences;
    private EncryptedPreferences mEncryptedPreferences;
    @InjectView(R.id.my_edittext) private EditText mEditText;
    @InjectView(R.id.saved_content) private TextView mTextView;
    @InjectView(R.id.saved_content_decrypted) private TextView mDecryptedText;
    @InjectView(R.id.saved_content_decrypted_desc) private TextView mDecryptedDesc;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.obscured_prefs_demo);

        mNormalSharedPreferences = getSharedPreferences(MY_APP_PREFENCES_NAME, MODE_PRIVATE);

        //EncryptedPreferences is defined by you and extends CryptoSharedPreferences
        mEncryptedPreferences = new EncryptedPreferences(this, mNormalSharedPreferences);
    }

    public void saveEncryptedClicked(View view) {
        //save input as encrypted
        mEncryptedPreferences.edit()
                .putString("first_name", mEditText.getText().toString())
                .commit();

        showRawContents(true);
    }

    public void saveNormallyClicked(View view) {
        //save unencrypted
        mNormalSharedPreferences.edit()
                .putString("first_name", mEditText.getText().toString())
                .commit();

        showRawContents(false);
    }

    private void showRawContents(boolean isEncrypted) {
        //demonstrate what could be viewed by a light-weight hacker
        mTextView.setText(mNormalSharedPreferences.getString("first_name", ""));

        //note: to read encrypted data, you would just use mEncryptedPreferences.getString(...
        if (isEncrypted) {
            mDecryptedDesc.setVisibility(View.VISIBLE);
            mDecryptedText.setText(mEncryptedPreferences.getString("first_name", ""));
            mDecryptedText.setVisibility(View.VISIBLE);
        } else {
            mDecryptedDesc.setVisibility(View.GONE);
            mDecryptedText.setVisibility(View.GONE);
        }
    }
}