Android:Activity to Fragment -

i want convert activity fragment able use in navigation drawer have errors

that's activity

public class recyclerviewactivity extends activity {  private list<person> persons; private recyclerview rv;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.recyclerview_activity);       rv=(recyclerview)findviewbyid(r.id.rv);      rv.sethasfixedsize(true);      linearlayoutmanager llm = new linearlayoutmanager(this);     rv.setlayoutmanager(llm);      initializedata();     initializeadapter(); }  private void initializedata(){     persons = new arraylist<>();     persons.add(new person("emma wilson", "23 years old", r.drawable.emma));     persons.add(new person("lavery maiss", "25 years old", r.drawable.lavery));     persons.add(new person("lillie watts", "35 years old", r.drawable.lillie));     persons.add(new person("ass","ass",r.drawable.lillie));     persons.add(new person("sfs","sfs",r.drawable.lavery));     persons.add(new person("fdfd" , "sfdfe" ,r.drawable.emma)); }  private void initializeadapter(){     rvadapter adapter = new rvadapter(persons);     rv.setadapter(adapter); } 

}

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that's fragment after converted

public class recyclerviewactivity extends fragment {  private list<person> persons; private recyclerview rv; public static final string tag = "rec";  @nullable @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     return inflater.inflate(r.layout.recyclerview_activity, container, false); }  @override public void onactivitycreated(bundle savedinstancestate) {     super.onactivitycreated(savedinstancestate);      rv = (recyclerview) getactivity().findviewbyid(r.id.rv);      rv.sethasfixedsize(true);      linearlayoutmanager llm = new linearlayoutmanager(this);     rv.setlayoutmanager(llm);      initializedata();     initializeadapter();}  private void initializedata() {     persons = new arraylist<>();     persons.add(new person("emma wilson", "23 years old", r.drawable.emma));     persons.add(new person("lavery maiss", "25 years old", r.drawable.lavery));     persons.add(new person("lillie watts", "35 years old", r.drawable.lillie));     persons.add(new person("ass", "ass", r.drawable.lillie));     persons.add(new person("sfs", "sfs", r.drawable.lavery));     persons.add(new person("fdfd", "sfdfe", r.drawable.emma)); }  private void initializeadapter() {     rvadapter adapter = new rvadapter(persons);     rv.setadapter(adapter); } 

}

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i have error in (this) in linear layout manger initialization

replace this getactivity().