java - How to Update a Fragment From PreferenceActivity? -

my main activity has several fragments, 1 of has listview or gridview. have preferenceactivity configures how app looks , functions, in particular whether display list or grid.

when list/grid view setting changed in preference activity want reflect change in fragment (located in app's main activity). how do separate activity? (in cast preference activity).

edit- managed accomplish using onresume() callback check if relevant preference changed, , if there change:

public void onresume() {     super.onresume();     sharedpreferences settings = getactivity().getsharedpreferences("settings", 0);     boolean layout = settings.getboolean("layout", false);     if (layout == true) {         listview.setvisibility(view.visible);         gridview.setvisibility(view.gone);     } else {         listview.setvisibility(view.gone);         gridview.setvisibility(view.visible);     }  } 

you can start preferenceactivity using startactivityforresult return result in mainactivity.in onactivityforresult() update view.

protected void onactivityresult(int requestcode, int resultcode, intent data) {         if(resultcode == result_ok){             //update view.         } }//onactivityresult