How could you increase the screen brightness in Android using a seek bar?

问题

I would like to increase the brightness of the screen using a seek bar within my Android application, but I'm not sure how to do this. How can I add this functionality?

回答1:

Using this you can set the screen brightness:

WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 100 / 100.0f;
getWindow().setAttributes(lp);

Now, as you want to implement progress bar like control, i would suggest you to implement SeekBar, so using this you can easily increase/decrease based on tracking value of seekbar.

Here is the full example implemented using the SeekBar.

回答2:

Use this to change the brightness (system-wide)

 ContentResolver cr = getContentResolver();
 int brightness = Settings.System.getInt(cr,Settings.System.SCREEN_BRIGHTNESS);            
 Settings.System.putInt(cr, Settings.System.SCREEN_BRIGHTNESS, brightness);
 WindowManager.LayoutParams lp = getWindow().getAttributes();
 lp.screenBrightness = brightness / 255.0f;
 getWindow().setAttributes(lp);

You may use this example and call the above code in onProgressChanged(). Default values of progress range from 0 to 100.

回答3:

You can change the screen brightness using the WindowManager.LayoutParams. Get the LayoutParams using getWindow().getAttributes() then set the field screenBrightness to a number between 0 to 1 (0 dark, 1 bright) and then call getWindow().setAttributes() with your modified LayoutParams object.

来源：https://stackoverflow.com/questions/7845458/how-could-you-increase-the-screen-brightness-in-android-using-a-seek-bar