这个事件不是点击键盘自动触发的事件吗？点了键盘在日志logcat里面没输出啊解决方案

//键盘事件
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        int a=keyCode;
        Log.i("GameView", ((Integer)a).toString());
        //处理键盘事件
        switch(keyCode){
        case KeyEvent.KEYCODE_DPAD_UP:
            player.move(Player.UP);
            break;
        case KeyEvent.KEYCODE_DPAD_DOWN:
            player.move(Player.DOWN);
            break;
        case KeyEvent.KEYCODE_DPAD_LEFT:
            player.move(Player.LEFT);
            break;
        case KeyEvent.KEYCODE_DPAD_RIGHT:
            player.move(Player.RIGHT);
            break;
        case KeyEvent.KEYCODE_DPAD_CENTER:
            for (int i = 0; i < bullets.length; i++) {
                if(bullets[i].getAlive()==false){
                    bullets[i].setAlive(true,player.getRefPixelX()-bullets[i].getWidth()/2,player.getRefPixelY()-player.getHeight());
                    break;
                }
            }
            break;
        }
        return super.onKeyDown(keyCode, event);
    }