emm,I'm Sorry to say that the result  I just said before is not right.

By using the native method setScreenState(), I make my device's screen
off.The code is:

int x=Power.setScreenState(false);//make the screen off
System.out.println(x);//0 will be print out
Thread.sleep(3000);
x=Power.setScreenState(true);//make the screen on
System.out.println(x);//0 will be print out

I tried this code on emulator, it works too.
PS: I use the 1.1r1 SDK and emulator

On Jul 21, 9:17 pm, Yuri Dario <mc6...@mclink.it> wrote:
> Hi,
>
> > public static native int setScreenState(boolean on)
>
> tried this one, but calling it does nothing, and always returns 2;
> since this is a native method, I think it means EACCESS (permission
> denied).
>
> thanks,
>
> Yuri
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