0

我整天都在绞尽脑汁想弄清楚这一点。我在使数据库正常工作时遇到了很多麻烦（现在可以了）。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（它太大而无法发布整个内容。

        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，这部分代码没有出现任何错误，但这应该会在屏幕上产生可见的按钮。它不是。此外，这部分代码中还会出现 nullpointerexception：

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);

单击 playerMenuAttack 精灵时出现空指针异常。它指向包含 attackButtons[i].setVisible(true); 的行 我完全失去了......

4

0 回答 0