android - Change TextView inside Fragment -


i followed guy's tutorial on how make actionbar. let's want change textview inside 1 of fragments. added on startactivity.java, under oncreate:

textview textview = (textview) findviewbyid(r.id.textview1); textview.settext("hi!"); 

when start app, crashes. can point me right direction?

i hope takes time @ guy's tutorial because layout same mine. thank you.

if want change component, suggest make method inside fragment this:

    import android.os.bundle;     import android.support.v4.app.fragment;     import android.view.layoutinflater;     import android.view.view;     import android.view.viewgroup;     import android.widget.textview;      public class detailfragment extends fragment {          @override         public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {             view view = inflater.inflate(r.layout.details, container, false);             return view;         }           public void settext(string text){             textview textview = (textview) getview().findviewbyid(r.id.detailstext);             textview.settext(text);         }      } 

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