android - Fragments in Tabs of ViewPager shows wrong data -

i got following tutorial http://blog.grafixartist.com/material-design-tabs-with-android-design-support-library/ after implementing viewpager. relised though correct interfaces shown in tabs. if put toast in 3 fragments. first displays toast second , second shows toast third, , third shows no toast though has toast.

below code

public class activeseen extends appcompatactivity {  // declaring view , variables  toolbar toolbar;   viewpager mviewpager;  parseuser muser; public string objectid; public string mser;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_active_seen);      toolbar = (toolbar) findviewbyid(r.id.tool_bar);     setsupportactionbar(toolbar);      muser = parseuser.getcurrentuser();       mser = muser.getusername();      intent = new intent();      intent geti=getintent();      objectid = geti.getstringextra("objectid");      final viewpager viewpager = (viewpager) findviewbyid(r.id.pager);      setupviewpager(viewpager);      tablayout tablayout = (tablayout) findviewbyid(r.id.tabanim_tabs);      tablayout.setupwithviewpager(viewpager);       tablayout.setontabselectedlistener(new tablayout.ontabselectedlistener() {         @override         public void ontabselected(tablayout.tab tab) {              viewpager.setcurrentitem(tab.getposition());              switch (tab.getposition()) {                 case 0:                  //   showtoast("one");                     break;                 case 1:                 //    showtoast("two");                     break;                 case 2:                   //  showtoast("three");                     break;             }         }          @override         public void ontabunselected(tablayout.tab tab) {         }          @override         public void ontabreselected(tablayout.tab tab) {         }     });   }  private void setupviewpager(viewpager viewpager) {      viewpageradapter adapter = new viewpageradapter(getsupportfragmentmanager());      adapter.addfrag(new criticalinformationfragment(), "critical information");     adapter.addfrag(new personalhistoryfragment(), "personal history");     adapter.addfrag(new obstetrichistoryfragment(), "obstetric history");    // adapter.addfrag(new medicalhistoryfragment(), "critical information");  //   adapter.addfrag(new sexuallytransmittedinfectionfragment(), "sexually transmitted infection");  //   adapter.addfrag(new familyhistoryfragment(), "family history");      viewpager.setadapter(adapter); }    class viewpageradapter extends fragmentpageradapter {     private final list<fragment> mfragmentlist = new arraylist<>();     private final list<string> mfragmenttitlelist = new arraylist<>();     public viewpageradapter(fragmentmanager manager) {         super(manager);     }     @override     public fragment getitem(int position) {         return mfragmentlist.get(position);     }     @override     public int getcount() {         return mfragmentlist.size();     }     public void addfrag(fragment fragment, string title) {         mfragmentlist.add(fragment);         mfragmenttitlelist.add(title);     }     @override     public charsequence getpagetitle(int position) {         return mfragmenttitlelist.get(position);     } } 

and 1 of fragment classes

public  class criticalinformationfragment extends fragment implements view.onclicklistener{      private static final string arg_section_number = "section_number";      textview name;     textview maidenname;      static textview dateofbirth;     textview registrationnumber;     textview bloodgrp;     textview rhesusfactor;     textview sicklingstatus;     textview hbelectro;     private floatingactionbutton fab1;      activeseen mactivity;       static edittext input;     string objectid;     parseuser muser;     private progressdialog progressdialog;       int color;      public static criticalinformationfragment newinstance(int sectionnumber) {         criticalinformationfragment fragment = new criticalinformationfragment();         bundle args = new bundle();         args.putint(arg_section_number, sectionnumber);         fragment.setarguments(args);         return fragment;     }       public criticalinformationfragment() {         this.color = color;     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.fragment_patient_info_screen_1, container, false);          toast.maketext(getactivity(),"critical" , toast.length_short).show();           final floatingactionbutton fabsave = (floatingactionbutton) rootview.findviewbyid(r.id.fabsave);         final floatingactionbutton fabconsult = (floatingactionbutton) rootview.findviewbyid(r.id.fabconsultation);         final floatingactionbutton fabrequest = (floatingactionbutton) rootview.findviewbyid(r.id.fablabrequest);          final tablerow row1 = (tablerow) rootview.findviewbyid(r.id.tablerow1);         final tablerow row2 = (tablerow) rootview.findviewbyid(r.id.tablerow2);         final tablerow row3 = (tablerow) rootview.findviewbyid(r.id.tablerow3);         final tablerow row4 = (tablerow) rootview.findviewbyid(r.id.tablerow4);         final tablerow row5 = (tablerow) rootview.findviewbyid(r.id.tablerow5);         final tablerow row6 = (tablerow) rootview.findviewbyid(r.id.tablerow6);         final tablerow row7 = (tablerow) rootview.findviewbyid(r.id.tablerow7);         final tablerow row8 = (tablerow) rootview.findviewbyid(r.id.tablerow8);          row1.setonclicklistener(this);         row2.setonclicklistener(this);         row3.setonclicklistener(this);         row4.setonclicklistener(this);         row5.setonclicklistener(this);         row6.setonclicklistener(this);         row7.setonclicklistener(this);         row8.setonclicklistener(this);          final framelayout framelayout = (framelayout) rootview.findviewbyid(r.id.frame_layout);         framelayout.getbackground().setalpha(0);         final floatingactionsmenu fabmenu = (floatingactionsmenu) rootview.findviewbyid(r.id.fabmenu);               fabsave.setonclicklistener(this);         fabconsult.setonclicklistener(this);         fabrequest.setonclicklistener(this);           mactivity = (activeseen) getactivity();           objectid = mactivity.objectid;             name = (textview) rootview.findviewbyid(r.id.nameedit);          maidenname= (textview) rootview.findviewbyid(r.id.maidenedit);          dateofbirth= (textview) rootview.findviewbyid(r.id.dateofbirthedit);          registrationnumber= (textview) rootview.findviewbyid(r.id.registrationedit);          bloodgrp= (textview) rootview.findviewbyid(r.id.bloodgrpedit);          rhesusfactor= (textview) rootview.findviewbyid(r.id.rhesusfactoredit);          sicklingstatus= (textview) rootview.findviewbyid(r.id.sicklingstatusedit);          hbelectro= (textview) rootview.findviewbyid(r.id.hbelectroedit);            getdataparse();           fabmenu.setonfloatingactionsmenuupdatelistener(new floatingactionsmenu.onfloatingactionsmenuupdatelistener() {             @override             public void onmenuexpanded() {                 framelayout.getbackground().setalpha(300);                 framelayout.setontouchlistener(new view.ontouchlistener() {                     @override                     public boolean ontouch(view v, motionevent event) {                         fabmenu.collapse();                         return true;                     }                  });             }               @override             public void onmenucollapsed() {                 framelayout.getbackground().setalpha(0);                 framelayout.setontouchlistener(null);             }         });           return rootview;     } 

you calling showing toast in oncreateview. in viewpager, view created before shown. stated in answer, should override setuservisiblehint action when fragment showing.