自定义布局访问activity

在fragment中有自定义布局,extend RelativeLayout

public class Footer extends RelativeLayout

如何从这个自定义对象中使用getSupportFragmentManager?我用this.getContext()的时候会给出应用,不是 FragmentActivity

 The method getSupportFragmentManager() is undefined for the type Footer (extends RelativeLayout)

this.getactivity()获得父activity

楼上回答正确,使用getActivity(),获取父的activity();