使用andengine NullpointerException创建一个按钮sprite数组

Question

我一直绞尽脑汁试图弄明白这一整天。我有足够的麻烦让数据库工作（它现在做）。我遇到的问题是我得到一个空指针异常。这是文件的重要部分（它的方式太大，无法发布整个文件。

        db = new MyDatabase(activity);

    attackCursor = db.getPlayerAttackWeapons();
    attackButtons = new ButtonSprite[attackCursor.getColumnCount()];
    if (attackCursor != null) {


      attackCursor.moveToFirst();
      while (attackCursor.isAfterLast() == false) {         
        attackButtons[attackButtonsCounter] =  
                new ButtonSprite(0, 0, PlayerMenu.getPlayerMenuAttackTR(),
                engine.getVertexBufferObjectManager()) {
            @Override
            public boolean onAreaTouched(TouchEvent pSceneTouchEvent,
                    float pTouchAreaLocalX, float pTouchAreaLocalY) {

                if (pSceneTouchEvent.isActionDown()) {
                    beep.play();
                    attackType = attackCursor.getInt(0);
                    this.setVisible(false);
                    selectTargetMessage.setVisible(true);
                    gameScene.unregisterTouchArea(this);
                    playerMenu.setVisible(false);
                    this.setParent(playerMenuAttack);

                }

                return super.onAreaTouched(pSceneTouchEvent, pTouchAreaLocalX,
                        pTouchAreaLocalY);

            }
        };
        attackButtons[attackButtonsCounter].setColor(Color.YELLOW);
        attackButtons[attackButtonsCounter].setPosition(0,attackButtonsYpos - 0-attackButtons[attackButtonsCounter].getHeight());

        attackButtonsYpos = attackButtonsYpos - 90;

        attackButtonsCounter++;
        attackCursor.moveToNext();
      }

    }

现在，这部分代码没有任何错误，但是这应该会在屏幕上产生可见的按钮。它不是。此外，nullpointerexception出现在代码的这一部分：

playerMenuAttack = new Sprite(0, 0, PlayerMenu.getPlayerMenuAttackTR(),
            engine.getVertexBufferObjectManager()) {
        @Override
        public boolean onAreaTouched(TouchEvent pSceneTouchEvent,
                float pTouchAreaLocalX, float pTouchAreaLocalY) {

            if (pSceneTouchEvent.isActionDown()) {
                beep.play();
                int i = 0;
                while (i <= attackButtons.length)
                 {
                    //getButtonTogglers(attackButtons[i]);
                    attackButtons[i].setVisible(true);
                    i++;
                }

            }

            return super.onAreaTouched(pSceneTouchEvent, pTouchAreaLocalX,
                    pTouchAreaLocalY);

        }
    };
    playerMenuAttack.setPosition(0,0);

当我点击playerMenuAttack sprite时，我得到了nullpointer异常。它指向包含attackButtons [i] .setVisible（true）的行;我完全失去了......