Why is onKey() called twice?

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OnKey is fired twice: the first time for key down, and the second time for key up, so you have to filter:

YOUR_VIEW.setOnKeyListener(new OnKeyListener()
        {                           
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {

                //This is the filter
                if (event.getAction()!=KeyEvent.ACTION_DOWN)
                    return true;

                switch (keyCode) {
                case KeyEvent.KEYCODE_1 : 
                    MakeToast(1);
                    break;
                case KeyEvent.KEYCODE_2 : 
                    MakeToast(2);
                    break;
                case KeyEvent.KEYCODE_3 : 
                    MakeToast(3);
                    break;

                }

                return true;
            }

        });

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