[android-developers] Turn screen OFF/ON or change brightness screen

Hi all!

I'm trying to control to turn screen off/on. I'm using device HTC G1
(1.6).
to turn off screen I write:
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 0f;
getWindow().setAttributes(lp);

but if i want to turn on screen

lp.screenBrightness = 1f;
getWindow().setAttributes(lp);

screen not turn on. if lp.screenBrightness = 0.02f; screen change
bright, but not turn off.

Which right way to control by screen? Could anyone help me?

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