scrollview容器的size用了setSize設了才可拖動,然後編譯android就出錯

scrollview容器的size用了setSize設了才可拖動,然後編譯android就出錯

是不是android.mk要加入什么???:14::14::14::14:

cocos2d-x 3.5
xcode 6.1

auto main_layer = ui::ScrollView::create();
main_layer->setDirection(cocos2d::ui::ScrollView::Direction::VERTICAL);
this->addChild(main_layer);
main_layer->setSize(Size(640,960));

除了要在android.mk里加入自建的自定义类,還要做些什么?