# Settings — Security Controls the app lock method, biometric options, auto-lock timeout, and screenshot restriction. --- ## Fragment — `SettingsSecurityFragment` --- ## Change Lock Method A **Change PIN** or **Change Pattern** button (label reflects current method) opens the security setup flow (same `SecuritySetupFragment` as onboarding) in change-mode. The user must first authenticate with the current PIN/pattern/biometric before the new one is accepted. --- ## Biometrics A toggle to enable or disable biometric authentication (fingerprint / face — `BIOMETRIC_WEAK`). - When enabled, `BiometricPrompt` is offered at the lock screen as an alternative to PIN/pattern - A secondary toggle controls whether biometrics are also required for transfer confirmation Biometric availability is checked via `BiometricManager.canAuthenticate()`. The toggle is disabled with an explanatory message if the device has no enrolled biometrics. --- ## Auto-Lock Timeout A `MaterialButtonToggleGroup` to set the inactivity timeout (`SettingsSecurityFragment.kt:81-94`). Default: **1 minute**. | Option | Timeout | |---|---| | 30 seconds | 30 s | | 1 minute | 60 s (default) | | 3 minutes | 180 s | | 5 minutes | 300 s | There is no "Never" option — auto-lock cannot be disabled. The selection is stored in `SharedPreferences` and read by `HomeActivity` on each timer reset. --- ## Auto-Unlock on Correct PIN When the lock method is **PIN**, an extra `switchAutoUnlockPin` toggle (`SettingsSecurityFragment.kt:45-51`) lets the entered PIN unlock immediately on the last correct digit, skipping the **Confirm** tap. Not available for the Pattern method. --- ## Screenshots A toggle for `FLAG_SECURE` on `HomeActivity`'s window. - **On (default)**: screenshots and screen recording are blocked system-wide while the app is in the foreground - **Off**: screenshots are allowed The lock screen always has `FLAG_SECURE` regardless of this setting. ---   --- [← Settings](14-settings.md)     **Next →** [Settings — Appearance](16-settings-appearance.md)