安全存储应用程序是一种加密数据并将其保护在设备上的方式，以便仅授权用户可以访问它们。以下是一些示例代码，可用于创建加密的安全存储应用程序：

1. 使用Android的SecureSharedPreference类

SecureSharedPreference类是Android框架提供的一种可靠的安全存储方案。它使用Advanced Encryption Standard（AES）加密对数据进行加密，并且只有在解密密钥可用时才能访问。以下是一个使用SecureSharedPreference类的示例：

import android.content.Context; import android.content.SharedPreferences; import android.security.KeyPairGeneratorSpec; import android.util.Base64;

import java.math.BigInteger; import java.security.InvalidAlgorithmParameterException; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.KeyStore; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.UnrecoverableEntryException; import java.security.cert.CertificateException; import java.security.spec.AlgorithmParameterSpec; import java.util.Calendar; import java.util.GregorianCalendar;

import javax.crypto.Cipher; import javax.security.auth.x500.X500Principal;

public class SecurePreferences {

private static final String TAG = "SecurePreferences";
private static final String ALIAS = "SecurePreferences";
private static SharedPreferences sharedPreferences;
private static KeyStore keyStore;
private static KeyPair keyPair;
private static PublicKey publicKey;
private static PrivateKey privateKey;
private static Cipher cipher;

private static void initialize(Context context) throws Exception {
    sharedPreferences = getSharedPreferences(context);
    keyStore = KeyStore.getInstance("AndroidKeyStore");
    keyStore.load(null);
    if (!keyStore.containsAlias(ALIAS)) {
        createNewKeys(context);
        saveKeys();
    } else {
        loadKeys();
    }
    cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
}

private static SharedPreferences getSharedPreferences(Context context) {
    return context.getSharedPreferences("SecurePreferences", Context.MODE_PRIVATE);
}

private static void createNewKeys(Context context) throws NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException {
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_RSA, "AndroidKeyStore");
        keyPairGenerator.initialize(
                new KeyGenParameterSpec.Builder(ALIAS, KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
                        .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_RSA