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I need to change the screen brightness programmatically. I read multiple solutions like this Can't apply system screen brightness programmatically in Android.
My problem is that those solutions implies changing the activity to be effective (having something like a dummy activity finishing immediately) and I would like to avoid the overhead of an activity switch.
Is there any other solution... maybe using native code so that the screen brightness will change immediately ?
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To change the brightness on an external monitor, use the buttons on it. The Brightness slider appears in action center in Windows 10, version 1903. To find the brightness slider in earlier versions of Windows 10, select Settings > System > Display, and then move the Change brightness slider to adjust the brightness.
The best monitor brightness for your eyes is between 40 to 60%. However, this value may vary depending on the ambient light conditions. Bright light conditions require higher brightness, while dim light conditions require lower brightness.
If you keep the screen brightness of your gadget at higher than 50 per cent, you still may not risk a permanent damage but many short term problems, such as digital eye strain, eye irritation and dry and fuzzy eyes.
There are many apps out there designed to turn your Android's screen brightness down even further. A couple of options are the Lower Brightness Screen Filter app and the Screen Filter app. Both of these have the option of lowering your screen brightness from zero to 100%.
The following affects immediately the single activity, no need to restart it. The activity also remembers the screenBrightness attribute over pause/resume.
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 1; // 0f - no backlight ... 1f - full backlight
getWindow().setAttributes(lp);
But it has no effect if you have automatic backlight level enabled in the system settings. This solution should help to turn off automatic backlight.
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