Turn the screen in to totally dark when press the button on the screen

问题

How to code the android to turn the screen completely off just like you press the power button to lock your screen.

I want the user to press the button on the screen and then screen goes off.

I have tried (with permission):

PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "tag");

wl.acquire();

but not working for me, please help! thank you!

来源：https://stackoverflow.com/questions/23432552/turn-the-screen-in-to-totally-dark-when-press-the-button-on-the-screen