How to turn screen off or send device to sleep

Question

I want to send device to sleep or turn the screen off. I have investigated and found this topic: Turn off screen on Android

Basically, the are three ways to do it, b

Answer 1

My application already does this fine, I found this in my PowerManager.class

 /**
 * Force the device to go to sleep. Overrides all the wake locks that are
 * held.
 * 
 * @param time is used to order this correctly with the wake lock calls. 
 *          The time  should be in the {@link SystemClock#uptimeMillis 
 *          SystemClock.uptimeMillis()} time base.
 */
public void goToSleep(long time) 
{
    try {
        mService.goToSleep(time);
    } catch (RemoteException e) {
    }
}