How do you set brightness of screen in Android?

Question

I want a dialog that adjusts brightness of the screen using SeekBar.

How to display custom dialog with SeekBar that adjusts brightness of screen?

Answer 1

You can use this API. This will change screen brightness of your window and not of the whole system.

        // Make the screen full bright for this activity.
        WindowManager.LayoutParams lp = getWindow().getAttributes();
        lp.screenBrightness = 1.0f;

        getWindow().setAttributes(lp);

Answer 2

This code snippet should help you

pdlg = ProgressDialog.show(getParent(), "Loading...", ""); 
WindowManager.LayoutParams lp = pdlg.getWindow().getAttributes();
p.dimAmount=0.0f;        //Dim Amount
pdlg.getWindow().setAttributes(lp);  //Applying properties to progress dialog
pdlg.dismiss(); //Dismiss the dialog

Answer 3

Hey you can set the system brightness like this:

 //Set the system brightness using the brightness variable value
System.putInt(cResolver, System.SCREEN_BRIGHTNESS, brightness);
//Get the current window attributes
LayoutParams layoutpars = window.getAttributes();
//Set the brightness of this window
layoutpars.screenBrightness = brightness / (float)255;
//Apply attribute changes to this window
window.setAttributes(layoutpars);

Or you may refer on this complete tutorial