If AI presses buttons - what buttons to press (key codes)

I'm programming an android game, where AI, like human, "presses buttons" - sends key events (KeyUp and KeyDown). I know, that there are some instrumental buttons like turn off, menu, etc. I'm using the following key codes now:

        for(int i=1;i<8;i++) {
            _set.setButtons(i, 398+i*2, 399+i*2);
        }

So it is 400,401,...,413. I've read on developer.android.com, that this codes are not assigned to anything. Is it safe to开发者_如何学编程 use this codes for AI "presses"? Is it a good manner?

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So, I'm using it for 2 months and all is ok. AI dispatches key event, which is handled in the same way as human's key press.