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我正在编写一个在屏幕上有两个软 d-pad 的应用程序。我在尝试捕获和理解两个同时触摸的所有触摸事件时遇到了极大的困难，因为每个 ACTION_MOVE 事件都表示 id 等于 0。

我所拥有的是两个“触摸”对象，当有触摸时它们会通过管道进入碰撞检测系统。请记住，我有两个方向键，并且都需要同时具有控制能力。

有没有人有什么建议。这是我的 onTouchEvent 方法。请记住，可能很难理解上下文，因为我使用自定义“触摸”游戏对象与 d-pad 进行碰撞检测。

@Override
public void onTouchEvent(MotionEvent e)
{   
    int index = e.getActionIndex();


    int action = MotionEventCompat.getActionMasked(e);
    // Get the index of the pointer associated with the action.
    //index = MotionEventCompat.getActionIndex(e);

    int id = e.getPointerId(index);


    if(touch1.pointerID<0)
        touch1.pointerID = id;
    else
        touch2.pointerID = id;

    switch(action)
    {
        case MotionEvent.ACTION_DOWN:
        {
            if(id == touch1.pointerID)
            {
                touch1.setCollideable(true);
                touch1.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch1.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();
            }
            else if(id==touch2.pointerID)
            {
                touch2.setCollideable(true);
                touch2.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch2.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();

            }

            break;  
        }
        case MotionEvent.ACTION_POINTER_DOWN:
        {
            if(id == touch1.pointerID)
            {
                touch1.setCollideable(true);
                touch1.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch1.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();
            }
            else if(id==touch2.pointerID)
            {
                touch2.setCollideable(true);
                touch2.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch2.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();

            }
            break;
        }
        case MotionEvent.ACTION_UP:
        {
            if(id == touch1.pointerID)
            {
                touch1.setCollideable(false);
                touch1.pointerID = -1;
                touch1.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch1.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();
            }
            else if(id==touch2.pointerID)
            {
                touch2.setCollideable(false);
                touch2.pointerID = -1;
                touch2.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch2.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();

            }
            break;
        }
        case MotionEvent.ACTION_POINTER_UP:
        {
            if(id == touch1.pointerID)
            {
                touch1.setCollideable(false);
                touch1.pointerID = -1;
                touch1.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch1.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();
            }
            else if(id==touch2.pointerID)
            {
                touch2.setCollideable(false);
                touch2.pointerID = -1;
                touch2.getPosition().x = e.getX(index)*GameWorldProperties.getWidthRatio();
                touch2.getPosition().y = e.getY(index)*GameWorldProperties.getHeightRatio();

            }
            break;
        }
        case MotionEvent.ACTION_MOVE:
        {
                Log.d("pointer",String.format("Move index=%s id=%s", index,id));

                for(int i=0;i<e.getPointerCount();i++)
                {
                    Log.d("pointer",String.format("i=%s id=%s",i,e.getPointerId(i)));

                    touch1.setCollideable(true);
                    touch1.getPosition().x = e.getX(i)*GameWorldProperties.getWidthRatio();
                    touch1.getPosition().y = e.getY(i)*GameWorldProperties.getHeightRatio();

                    touch2.setCollideable(true);
                    touch2.getPosition().x = e.getX(i)*GameWorldProperties.getWidthRatio();
                    touch2.getPosition().y = e.getY(i)*GameWorldProperties.getHeightRatio();
                }

            break;
        }
        default:
        {
            break;
        }
    }
4

1 回答 1

1

希望这可以帮助。这是从《开始 Android 游戏编程》一书开始的。

public boolean onTouch(View v, MotionEvent event) {
    synchronized (this) {
        int action = event.getAction() & MotionEvent.ACTION_MASK;
        int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT;
        int pointerId = event.getPointerId(pointerIndex);
        TouchEvent touchEvent;

        switch (action) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_POINTER_DOWN:
            touchEvent = touchEventPool.newObject();
            touchEvent.type = TouchEvent.TOUCH_DOWN;
            touchEvent.pointer = pointerId;
            touchEvent.x = touchX[pointerId] = (int) (event
                    .getX(pointerIndex) * scaleX);
            touchEvent.y = touchY[pointerId] = (int) (event
                    .getY(pointerIndex) * scaleY);
            isTouched[pointerId] = true;
            touchEventsBuffer.add(touchEvent);
            break;

        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_POINTER_UP:
        case MotionEvent.ACTION_CANCEL:
            touchEvent = touchEventPool.newObject();
            touchEvent.type = TouchEvent.TOUCH_UP;
            touchEvent.pointer = pointerId;
            touchEvent.x = touchX[pointerId] = (int) (event
                    .getX(pointerIndex) * scaleX);
            touchEvent.y = touchY[pointerId] = (int) (event
                    .getY(pointerIndex) * scaleY);
            isTouched[pointerId] = false;
            touchEventsBuffer.add(touchEvent);
            break;

        case MotionEvent.ACTION_MOVE:
            int pointerCount = event.getPointerCount();
            for (int i = 0; i < pointerCount; i++) {
                pointerIndex = i;
                pointerId = event.getPointerId(pointerIndex);

                touchEvent = touchEventPool.newObject();
                touchEvent.type = TouchEvent.TOUCH_DRAGGED;
                touchEvent.pointer = pointerId;
                touchEvent.x = touchX[pointerId] = (int) (event
                        .getX(pointerIndex) * scaleX);
                touchEvent.y = touchY[pointerId] = (int) (event
                        .getY(pointerIndex) * scaleY);
                touchEventsBuffer.add(touchEvent);
            }
            break;
        }

        return true;
    }
}
于 2013-06-20T19:17:59.453 回答