changing screen brightness programmatically in android

Question

I want to change the screen brightness programmatically in android. At the moment I use this code:

WindowManager.LayoutParams lp = getWindow().getAttributes();
float brightness=1.0f;
lp.screenBrightness = brightness;
getWindow().setAttributes(lp);

But this sample code works on cupcake, not on latest versions. I am using the latest version of SDK.. What is the preferred solution for newer Android Versions?

Answer 1

This is possible to do by using:

WindowManager.LayoutParams layout = getWindow().getAttributes();
layout.screenBrightness = 1F;
getWindow().setAttributes(layout);

See also: http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#screenBrightness

Answer 2

You have to add params to Window before it is created otherwise it will throw java.lang.IllegalArgumentException: Window type can not be changed after the window is added.

See the example with a android.app.Dialog.Dialog.

final Dialog dialog = new Dialog(this) {
            @Override
            public void onAttachedToWindow() {
                super.onAttachedToWindow();
                WindowManager.LayoutParams layout = getWindow()
                        .getAttributes();
                layout.screenBrightness = 1F;
                getWindow().setAttributes(layout);
            }
        };
        dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        dialog.show();

Please note that brightness value is between 0.0F and 1.0F.

Answer 3

How about using the IHardwareService interface for this? An example can be found in this tutorial.

Update: tutorial link still works, but actual code is also available in next answer.