android - Set TextView not changing -

in following code, have options menu , when select menu option, want update textview. setting text works fine , no errors generated. here code settext isn't working. have put in debug statements , code getting hit, text not updating. put arrows next code isn't updating. review other textview examples, can't figure out.

        @override public boolean onoptionsitemselected(menuitem item) {      switch (item.getitemid()) {         case r.id.menu_item_bflat:             if (verbose) log.v(tag, "+++ menu_item_bflat +++");             // bflat = 1             mkeyselected = bflat;     >>>>        mchapterselected.settext("b flat");              return true;         case r.id.menu_item_eflat:             // eflat = 2             mkeyselected = eflat;     >>>>        mchapterselected.settext("e flat");             return true;         default:             return super.onoptionsitemselected(item);     } // switch } // onoptionsitemselected 

here rest of code, if needed:

    public class chapterlistfragment extends listfragment { private static final boolean verbose = true; private arraylist<chapters> mchapters; private static final string tag = "chapterlistfragment"; private static final int bflat = 1; private static final int eflat = 2;  private textview mchapterselected; private view mview; private int mkeyselected;     @override public void oncreate(bundle savedinstancestate) {     if (verbose) log.v(tag, "+++ oncreate +++");     super.oncreate(savedinstancestate);      // must explicitly tell fragment manager fragment should receive call     // oncreateoptionsmenu().     sethasoptionsmenu(true);      // view fields     if (mview == null) {         mview = getactivity().getlayoutinflater()                 .inflate(r.layout.activity_improvisation, null);     }      getactivity().settitle(r.string.chapters_title);     mchapters = chapterlist.get(getactivity()).getchapters();      chapteradapter adapter = new chapteradapter(mchapters);     setlistadapter(adapter);              mchapterselected = (textview) mview.findviewbyid(r.id.chapter_selected);     mchapterselected.settext("chapter selected here");           }  @override public void onlistitemclick(listview l, view v, int position, long id) {                  // chapter adapter     chapters c = ((chapteradapter)getlistadapter()).getitem(position);      //start improvisationactivity     intent = new intent(getactivity(), improvisationactivity.class);     i.putextra(chapterfragment.extra_chapter_id, c.getid());     i.putextra(chapterfragment.extra_keyselected, mkeyselected);     startactivity(i); }      @override public void oncreateoptionsmenu(menu menu, menuinflater inflater) {     super.oncreateoptionsmenu(menu, inflater);     inflater.inflate(r.menu.fragment_chapters_list, menu); } 

here xml file

    <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" >  <linearlayout      android:layout_weight="2"      android:layout_height="fill_parent"      android:layout_width="match_parent"      > <videoview      android:id="@+id/video_view"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="center"     /> </linearlayout>   <linearlayout      android:layout_weight="1"      android:layout_height="fill_parent"      android:layout_width="fill_parent"     android:orientation="vertical"  >       <linearlayout          android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_marginleft="16dp"         android:layout_marginright="16dp"         android:orientation="horizontal" >          <textview             android:id="@+id/chapter_selected"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity = "center"            android:textstyle="bold"            android:paddingleft="4dp"            android:paddingright="4dp"            android:text="chapter selection"     />                            </linearlayout>  <framelayout            android:id="@+id/fragmentcontainer"           android:layout_height="match_parent"           android:layout_width="match_parent"            /> </linearlayout> 

i didn't find out why couldn't settext, displaying subtitles after user selects menu item works purposes.