How can I control the brightness of the device screen from my application in Jetpack Compose?

Question

I am making a simple app in which I want that when I press a button the brightness of the device is set to maximum and when I press it again it goes back to how it was before. but I can't find anywhere on the internet how to do this, I've been trying several ways and I can't get it to work.

Answer 1

Here is how to change brightness

@Composable
fun UpdateBrightness() {
    val context = LocalContext.current
    DisposableEffect(Unit) {
        setBrightness(context, isFull = true)
        onDispose {
            setBrightness(context, isFull = false)
        }
    }
}

fun setBrightness(context: Context, isFull: Boolean) {
    val activity = context as? Activity ?: return
    val layoutParams: WindowManager.LayoutParams = activity.window.attributes
    layoutParams.screenBrightness = if (isFull) 1f else WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
    activity.window.attributes = layoutParams
}

@Composable
fun MyScreen() {
    UpdateBrightness() // Set maximum brightness by default
    ...
}

The code is taken from this article: https://medium.com/@yhdista/change-the-brightness-for-the-screen-thinking-in-compose-84378dce3b6c