新增觸控支援

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如要處理觸控輸入事件,請讀取遊戲迴圈中的陣列 motionEvents。這些事件包含自上次清除這些陣列之後發生的事件。包含的事件數量會儲存在 motionEventsCount 中。

  1. 疊代並處理遊戲迴圈中的各個事件。在這個範例中,以下程式碼會疊代 motionEvents,並透過 handle_event 進行處理:

    for(size_t i = 0; i < mApp->motionEventsCount; ++i) {
      GameActivityMotionEvent* motionEvent = mApp->motionEvents[i];
    
      int action = motionEvent->action;
      int actionMasked = action & AMOTION_EVENT_ACTION_MASK;
      int ptrIndex = (action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK) >>
        AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
    
      struct CookedEvent ev;
      memset(&ev, 0, sizeof(ev));
    
      if (actionMasked == AMOTION_EVENT_ACTION_DOWN ||
        actionMasked == AMOTION_EVENT_ACTION_POINTER_DOWN) {
          ev.type = COOKED_EVENT_TYPE_POINTER_DOWN;
      } else if (actionMasked == AMOTION_EVENT_ACTION_UP ||
        actionMasked == AMOTION_EVENT_ACTION_POINTER_UP) {
          ev.type = COOKED_EVENT_TYPE_POINTER_UP;
      } else {
          ev.type = COOKED_EVENT_TYPE_POINTER_MOVE;
      }
    
      ev.motionPointerId = motionEvent->pointers[ptrIndex].id;
      ev.motionIsOnScreen = motionEvent->source == AINPUT_SOURCE_TOUCHSCREEN;
      ev.motionX = GameActivityPointerInfo_getX(
        &motionEvent->pointers[ptrIndex]);
      ev.motionY = GameActivityPointerInfo_getY(
        &motionEvent->pointers[ptrIndex]);
    
      if (ev.motionIsOnScreen) {
        // Use screen size as the motion range.
        ev.motionMinX = 0.0f;
        ev.motionMaxX = SceneManager::GetInstance()->GetScreenWidth();
        ev.motionMinY = 0.0f;
        ev.motionMaxY = SceneManager::GetInstance()->GetScreenHeight();
      }
    
      handle_event(&ev);
    }
    
  2. 完成後,請記得清除剛處理的事件佇列:

    android_app_clear_motion_events(mApp);