text - android - textswitcher in fragment -

using horizontalpaging example in android studio, put 2 activities, tab1.java , tab2.java. , want put textswitcher in both activity. but, textview(tab1.this) in tab1.java make error. , think has problems. how can make codes work?

mainactivity.java

public class mainactivity extends fragmentactivity implements     actionbar.tablistener {  sectionspageradapter msectionspageradapter;  viewpager mviewpager;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.sample_main);      final actionbar actionbar = getactionbar();     actionbar.setnavigationmode(actionbar.navigation_mode_tabs);      msectionspageradapter = new sectionspageradapter(             getsupportfragmentmanager());      // set viewpager sections adapter.     mviewpager = (viewpager) findviewbyid(r.id.pager);     mviewpager.setadapter(msectionspageradapter);       mviewpager             .setonpagechangelistener(new viewpager.simpleonpagechangelistener() {                 @override                 public void onpageselected(int position) {                     actionbar.setselectednavigationitem(position);                 }             });       (int = 0; < msectionspageradapter.getcount(); i++) {          actionbar.addtab(actionbar.newtab()                 .settext(msectionspageradapter.getpagetitle(i))                 .settablistener(this));     } }  @override public void ontabselected(actionbar.tab tab,                           fragmenttransaction fragmenttransaction) {     // when given tab selected, switch corresponding page in     // viewpager.     mviewpager.setcurrentitem(tab.getposition()); }  @override public void ontabunselected(actionbar.tab tab,                             fragmenttransaction fragmenttransaction) { }  @override public void ontabreselected(actionbar.tab tab,                             fragmenttransaction fragmenttransaction) { }   public class sectionspageradapter extends fragmentpageradapter {     context mcontext;      public sectionspageradapter(fragmentmanager fm) {         super(fm);     }      @override     public fragment getitem(int position) {          switch(position) {             case 0:                 return new tab1(mcontext);             case 1:                 return new tab2(mcontext);          }         return null;     }      @override     public int getcount() {         // show 3 total pages.         return 2;     }      @override     public charsequence getpagetitle(int position) {         locale l = locale.getdefault();         switch (position) {             case 0:                 return getstring(r.string.title_section1).touppercase(l);             case 1:                 return getstring(r.string.title_section2).touppercase(l);          }         return null;     } }   public static class dummysectionfragment extends fragment {      public static final string arg_section_number = "section_number";      public dummysectionfragment() {     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.fragment_main_dummy,                 container, false);         textview dummytextview = (textview) rootview                 .findviewbyid(r.id.section_label);         dummytextview.settext(integer.tostring(getarguments().getint(                 arg_section_number)));         return rootview;     } }} 

tab1.java

public class tab1 extends fragment { context mcontext;  public tab1(context context) {     mcontext = context; } private textswitcher mswitcher; button button1;  string texttoshow[]={"st1","st2","st3","st4","st5","st6"}; int messagecount=texttoshow.length;  int currentindex=-1;  public view oncreateview(layoutinflater inflater,                         viewgroup container,bundle savedinstancestate) {     view view = inflater.inflate(r.layout.activity_tab1, null);     super.oncreate(savedinstancestate);      button1=(button)view.findviewbyid(r.id.button1);     mswitcher = (textswitcher) view.findviewbyid(r.id.textswitcher);     mswitcher.setfactory(new viewswitcher.viewfactory() { @override     public view makeview() {     textview mytext = new textview(tab1.this);     mytext.setgravity(gravity.top | gravity.center_horizontal);     mytext.settextsize(36);     return mytext; }});      button1.setonclicklistener(new view.onclicklistener() {          public void onclick(view v) {     // todo auto-generated method stub     currentindex++;     // if index reaches maximum reset     if (currentindex == messagecount)         currentindex = 0;     mswitcher.settext(texttoshow[currentindex]); }});     return view; } } 

activity_tab1.xml

 <textswitcher     android:layout_margintop="50dp"     android:id="@+id/textswitcher"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_gravity="center_horizontal" />  <button     android:id="@+id/button1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="next"     android:layout_alignparentbottom="true"     android:layout_alignparentright="true"     android:layout_alignparentend="true"     android:singleline="false"     android:typeface="normal" />