display_brightness 0.1.1+1

Control app-level screen brightness on iOS and Android using direct native interop (jnigen/swiftgen). No permissions required.

display_brightness

A Flutter plugin for controlling app-level screen brightness on iOS and Android using direct native interop via jnigen (Android) and swiftgen (iOS).

Features

• Set brightness — Control the app-level screen brightness (0.0–1.0)
• Get brightness — Read the current effective brightness
• Monitor changes — Stream of brightness change events
• No permissions — Uses app-level APIs that don't require permissions
• Native-Speed — Direct JNI/FFI calls, no method channels

Usage

import 'package:display_brightness/display_brightness.dart';

// Create a controller (auto-detects platform)
final controller = DisplayBrightnessController();

// Get current brightness
final current = controller.brightness; // 0.0–1.0 (can be null)

// Set brightness
controller.setBrightness(0.8);

// Listen to brightness changes
final subscription = controller.onBrightnessChanged.listen((value) {
  print('Brightness changed: $value');
});

// Cleanup when done
subscription.cancel();
controller.dispose();

API

DisplayBrightnessController

Method	Description
double? get brightness	Current effective brightness (0.0–1.0), or null if it cannot be read
void setBrightness(double value)	Set app-level brightness (0.0–1.0)
Stream<double> get onBrightnessChanged	Broadcast stream of brightness changes
void dispose()	Release native resources

Platform Details

Android

• Uses WindowManager.LayoutParams.screenBrightness
• onBrightnessChanged uses ContentObserver on Settings.System.SCREEN_BRIGHTNESS

iOS

• Uses UIScreen.main.brightness
• onBrightnessChanged uses UIScreen.brightnessDidChangeNotification

Development

Regenerating bindings

After modifying native code, regenerate bindings:

# Build Android first
cd example && flutter build apk && cd ..

# Generate Android bindings
dart run tool/jnigen.dart

# Generate iOS bindings (requires Xcode)
dart run tool/swiftgen.dart

Troubleshooting Android Bindings Generation

If you encounter the following error when running tool/jnigen.dart:

Unexpected end of input (at character 1)

This is likely because the compiled classes parser fails. You can resolve this by rebuilding the Android library with the gradle wrapper directly.

Run the following from the plugin's example/android directory:

./gradlew :display_brightness:assembleDebug --no-daemon --console=plain --refresh-dependencies --rerun-tasks

Special thanks to Dominik Roszkowski for sharing this fix in his article: jnigen and swiftgen in 2026 - some lessons learned.