游戏控制器的Android Multitouch问题

Question

我正在编写一个在屏幕上有两个软d-pad的应用程序。我很难尝试捕获和理解两个同时触摸的所有触摸事件，因为每个ACTION_MOVE事件都表明id等于0。

我所拥有的是两个“触摸”物体，当触摸时它们会通过管道进入碰撞检测系统。记住我有两个d-pad，两者都需要能够同时控制。

有没有人有任何建议。这是我的onTouchEvent方法。请记住，可能很难理解上下文，因为我使用cusomt'touch'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;
        }
    }

Answer 1

希望这会有所帮助。这是来自Beginning Android Game Programming book。

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;
    }
}