Security

// Add security dependencies
dependencies {
    implementation 'androidx.security:security-crypto:1.1.0-alpha06'
    implementation 'androidx.biometric:biometric:1.2.0-alpha05'
}

// Encryption Example
class SecurityManager {
    private val masterKey = MasterKey.Builder(applicationContext)
        .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
        .build()
    
    private val encryptedSharedPreferences = EncryptedSharedPreferences.create(
        applicationContext,
        "secure_prefs",
        masterKey,
        EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
        EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
    )
    
    fun saveSecureData(key: String, value: String) {
        encryptedSharedPreferences.edit()
            .putString(key, value)
            .apply()
    }
    
    fun getSecureData(key: String): String? {
        return encryptedSharedPreferences.getString(key, null)
    }
}

// Biometric Authentication Example
class BiometricAuthActivity : AppCompatActivity() {
    private lateinit var biometricPrompt: BiometricPrompt
    private lateinit var promptInfo: BiometricPrompt.PromptInfo
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_biometric)
        
        val executor = ContextCompat.getMainExecutor(this)
        biometricPrompt = BiometricPrompt(this, executor,
            object : BiometricPrompt.AuthenticationCallback() {
                override fun onAuthenticationSucceeded(
                    result: BiometricPrompt.AuthenticationResult
                ) {
                    super.onAuthenticationSucceeded(result)
                    // Handle successful authentication
                }
            })
        
        promptInfo = BiometricPrompt.PromptInfo.Builder()
            .setTitle("Biometric Authentication")
            .setSubtitle("Log in using your biometric credential")
            .setNegativeButtonText("Cancel")
            .build()
        
        biometricPrompt.authenticate(promptInfo)
    }
}

// Network Security Example
class NetworkSecurityConfig {
    fun getOkHttpClient(): OkHttpClient {
        return OkHttpClient.Builder()
            .certificatePinner(
                CertificatePinner.Builder()
                    .add("api.example.com", "sha256/...")
                    .build()
            )
            .build()
    }
}