# Settings — Security

Controls the app lock method, biometric options, auto-lock timeout, and screenshot restriction.

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## Fragment — `SettingsSecurityFragment`

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## 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.

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## 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.

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## Auto-Lock Timeout

A radio group or dropdown to set the inactivity timeout:

| Option | Timeout |
|---|---|
| 30 seconds | 30 s |
| 1 minute | 60 s |
| 3 minutes | 180 s |
| 5 minutes | 300 s |
| Never | Disabled |

The selection is stored in `SharedPreferences` and read by `HomeActivity` on each timer reset.

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## 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.

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[← Settings](14-settings.md)     **Next →** [Settings — Appearance](16-settings-appearance.md)