android - call methods defined in the fragments from SherlockFragmentActivity -

i using sherlockfragmentactivity 2 fragments. want call methods defined in fragments sherlockfragmentactivity.

fragment1 extends fragment{    protected void resetsettings(){       //my code     }      } 

and activity

 main extends sherlockfragmentactivity{     //here want call resetsettings()   }