Android performClick on random button [android help]

Android performClick on random button

I need to do performClick() method on random button. Getting NullPointerException

final Button[] buttons = {bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8, bt9};

bt1.setOnClickListener(new View.OnClickListener() {

            public void onClick(View p1)
            {
                // TODO: Implement this method

                int rando = (int) (Math.random()*9);
                Button randombutton = (buttons[rando]);
                randombutton.performClick();
            }

    });

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