如何让OnWindowFocusChanged事件从Android的活动片段中返回??:阿

I have an fragment activity.Inside that there is a fragment. When i click on a button which is on the activity.one dialog shows up.but when i dismiss the dialog i need to do some UI changes in the fragment. But i am not getting On window focus change event in fragment. But while dismissing the dialog.the activity is receiving focus change event. How to get focus change event in a fragment? Is there any callback or any interface we can implement.I implemented on focus change listener in androi but it didnt work.I have an fragment activity.Inside that there i