How could you increase the screen brightness in Android using a seek bar?
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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?
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Answer:
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. http://android-er.blogspot.com/2011/02/change-android-screen-brightness.html is the full example implemented using the SeekBar.
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Other answers
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 http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/SeekBar1.html and call the above code in onProgressChanged(). Default values of progress range from 0 to 100.
Reno
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.
Jong
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