MvvmCross Plugin to manipulate device brightness
Resolve it:
var brightnessService = Mvx.Resolve<IBrightnessService>();
Use it at will:
// Sets the brightness. Parameter must be between 0 and 1 for iOS and between -1 and 1 for Android, or else this will throw.
brightnessService.SetBrightness(0.2);
// Get brightness.
brightnessService.GetBrightness();
Check the Sample projects for a working example.