android - call method from fragment to Activity -

hello have activity , call many fragment based on application business need call method fragment in activity searched in internet cannot find solution

this fragment :

public class homefragment extends fragment implements view.onclicklistener { public homefragment() {     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         // inflate layout fragment         log.d("oncreate", "oncreateviewhf");         view = inflater.inflate(r.layout.new_fragment_home, container, false); }  /// method need call in activity   public void adduserlineinfofragment() {         userlineinfofragment = new userlineinfofragment();         fragmenttransaction transaction = getchildfragmentmanager().begintransaction();         transaction.replace(r.id.user_info_fragment_container, userlineinfofragment).commit();         log.d("hommetest","hommmme");     } 

call method of activity fragment

 ((youractivityname)getactivity()).adduserlineinfofragment(); 

call method of fragment activity

1. create interface

 public interface onbuttonlistener     {         void onbuttonclick();     } 

2. init in activity

 protected onbuttonlistener onactionbuttonlistener;      public void setonbuttonlistener(onbuttonlistener actionbuttonlistener)     {         this.onactionbuttonlistener = actionbuttonlistener;     } 

3. in activity, click event when action need perform

this.onactionbuttonlistener.onbuttonclick(); 

4. implement listener(onbuttonlistener) in fragment

 @override     public void onbuttonclick(){} 

5. in fragment oncreateview

((youractivityname) getactivity()).setonbuttonlistener(this);