與遊戲控制器有關的Android多點觸控問題

Question

我正在編寫一個應用程序，該應用程序在屏幕上有兩個軟性d-pad。我極其困難地試圖捕捉和理解兩個同時觸摸的所有觸摸事件，因爲事實是每個ACTION_MOVE事件都說ID等於0.

我所擁有的是兩個'touch'對象，當碰觸時碰撞到碰撞檢測系統。記住我有兩個d-pad，兩者都需要有能力同時控制。

有沒有人有任何建議。這是我的onTouchEvent方法。請記住，可能難以理解上下文，因爲我使用cusomt'touch'gameobject與d-pad進行碰撞檢測。

@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

希望這會有所幫助。這是從開始的Android遊戲編程書。

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; 
    } 
}