如何通过另一个活动刷新viewpageadapter中的片段

I have a situation for my android app.The scenario is I am using a viewpage adapter whering I have 3 pages which are actually are fragments.My issues is that I want to update these from a dialog activity .The dialog activity containg a list from whose onclick event I want to update the fragment.I have a situation for my android app.The scena