How can I make changes to android screen brightness persistent?

Question

I've managed to change screen brightness within an activity (and by extension the entire app) using the following code:

Settings.System.putFloat(this.getContentResolver(),Settings.System.SCREEN_BRIGHTNESS, ((float)LocationService.settings.screenBrightness));

WindowManager.LayoutParams lp = getWindow().getAttributes();
float brightness = someValue;
lp.screenBrightness = brightness;
getWindow().setAttributes(lp);

However, as soon as I close the app the brightness returns to its previous settings. Is there anyway to make these changes persist outside of the lifecycle of the app?

Thanks!

Your question is identical to this one: http://stackoverflow.com/q/3737579/83446 Did you even run a search first? Somebody mark as duplicate. — Robert Massaioli, Jun 01 '11 at 04:04
@Robert Massaioli: I don't think this is a duplicate because the question you linked to is about `changing screen brightness programmatically` while here the poster is asking about `how to make change to Android screen brightness persistent`. — Mudassir, Jun 01 '11 at 05:48
@Robert Massaioli: Actually, I did perform a search. In fact, I read that exact question. However, as Mudassir pointed out, my issue is not simply adjusting brightness within the app; the problem lies in making those changes last even after the app has been paused or stopped. — dckrooney, Jun 01 '11 at 07:16
Point taken. You are right they are different points. My mistake. — Robert Massaioli, Jun 01 '11 at 12:18

score 0 · Answer 1 · answered Oct 22 '12 at 07:13

Try this

Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE, Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);

int brightnessLevel = 255;
Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, brightnessLevel);

You will need the WRITE_SETTINGS permission set in your AndroidManifest.xml

http://android-er.blogspot.com/2011/02/change-system-screen-brightness-using.html

score 0 · Answer 2 · answered Oct 22 '12 at 07:16

Settings application does it this way:

private static final int MINIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_DIM + 10;
private static final int MAXIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_ON;

System.putInt(getContext().getContentResolver(), Settings.System.SCREEN_BRIGHTNESS, value + MINIMUM_BACKLIGHT);

but I suspect you cannot change a System Settings without having system shared user id

score 0 · Answer 3 · answered Jul 15 '15 at 19:36

Provide the permission in androidMainfest.xml

<uses-permission android:name="android.permission.WRITE_SETTINGS"/>

And provide a integer number between 0 to 255

//number>=0 && number<=255
//If you have passed context then you can use context.getContentResolver()
android.provider.Settings.System.putInt(cgetContentResolver(),
            android.provider.Settings.System.SCREEN_BRIGHTNESS,
            number);

score 0 · Answer 4 · edited Oct 22 '12 at 06:34

0

Here maybe help you:

WindowManager.LayoutParams layoutParams = getWindow().getAttributes();  
layoutParams.buttonBrightness = value;
getWindow().setAttributes(layoutParams);

edited Oct 22 '12 at 06:34

Marco

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answered Jun 15 '11 at 07:07

How can I make changes to android screen brightness persistent?

4 Answers4