code: public MultiTouchAction perform() {
          List<TouchAction> touchActions = actions.build();
          checkArgument(touchActions.size() > 0,
                  "MultiTouch action must have at least one TouchAction added before it can be performed");
          if (touchActions.size() > 1) {
              performsTouchActions.performMultiTouchAction(this);
              return this;
          }  //android doesn't like having multi-touch actions with only a single TouchAction...
          performsTouchActions.performTouchAction(touchActions.get(0));
          return this;
      }
docs: Perform the multi-touch action on the mobile performsTouchActions.