Screen Brightness

The Screen Brightness JavaScript Bridge method lets you set the device's screen brightness at runtime, overriding the user's system setting while they're inside your app. It's part of Median's Device Screen Control feature set, alongside Keep Screen On and Full Screen.

Why Use Screen Brightness

• Low-light and night reading modes: Automatically dim the screen for reading, news, or ebook apps so brightness matches your app's own dark mode or a scheduled "night" experience.
• Camera-driven flows: Boost brightness before opening a barcode, QR, or document scanning flow so the camera has enough light to focus and capture accurately.
• Photo and video accuracy: Raise brightness when displaying photos, videos, or color-critical content so users see true colors and detail instead of a dimmed system setting.
• Kiosk and presentation displays: Lock brightness at maximum for outward-facing kiosk, signage, or in-store display use cases where the screen must stay clearly visible.
• Battery-conscious experiences: Lower brightness during long-running sessions like maps, tracking, or background-heavy screens to help conserve battery.
• User-controlled accessibility: Expose an in-app brightness slider so users can fine-tune brightness to their needs without leaving your app to use system controls.

JavaScript Bridge Implementation

Set Screen Brightness

Sets the device screen to a specific brightness level

median.screen.setBrightness({'brightness':'0.8'})';

Restore Brightness on Navigation

To apply a brightness change that automatically reverts once the user navigates to a new page:

median.screen.setBrightness({'brightness':'0.8', 'restoreOnNavigation': true});

Reset to Default Brightness

To clear any brightness override and return control to the device's system setting:

median.screen.setBrightness({'brightness':'default'})';