android - How to swipe between Fragments with FragmentPagerAdapter -

i can't figure out why swiping between fragments isn't working,

here custom fragmentpageradapter:

public class tabspageradapter extends fragmentpageradapter {  public tabspageradapter(fragmentmanager fm) {     super(fm); }  @override public fragment getitem(int index) {      switch (index) {         case 0:             return new prearrivalplan();         case 1:             return new primarysurvey();         case 2:             return new vitals();         case 3:             return new secondarysurvey();         case 4:             return new preparefortravel();     }      return null; }  @override public int getcount() {     // item count - equal number of tabs     return 5; } 

}

and here activity uses it:

public class mainactivity extends fragmentactivity implements actionbar.tablistener {  private customviewpager  viewpager; private tabspageradapter tabspageradapter; private actionbar        actionbar;  private string[] tabtitles = {"pre-arrival plan", "primary survey", "vitals", "secondary survey", "prepare travel"}; private int      totaltabs = 5;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      viewpager = (customviewpager) findviewbyid(r.id.pager);     actionbar = getactionbar();     tabspageradapter = new tabspageradapter(getsupportfragmentmanager());      viewpager.setadapter(tabspageradapter);     viewpager.setpagingenabled(false);      actionbar.sethomebuttonenabled(true);     actionbar.setnavigationmode(actionbar.navigation_mode_tabs);      viewpager.setonpagechangelistener(new customviewpager.onpagechangelistener() {          @override         public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) {          }          @override         public void onpageselected(int position) {             actionbar.setselectednavigationitem(position);         }          @override         public void onpagescrollstatechanged(int state) {          }      });      viewpager.setoffscreenpagelimit(totaltabs);      // remove android icon action bar     getactionbar().seticon(new colordrawable(getresources().getcolor(android.r.color.transparent)));     getactionbar().setdisplayshowhomeenabled(false);      // add tabs action bar     (string tab_name : tabtitles) {         spannablestring s = new spannablestring(tab_name);         s.setspan(new typefacespan("helveticaneuelight.ttf"), 0, s.length(),                 spannable.span_exclusive_exclusive);         actionbar.addtab(actionbar.newtab().settext(s).settablistener(this));     }  }  @override public boolean oncreateoptionsmenu(menu menu) {     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }  public void updatetabtitles(int tabnumber, int checkboxesremaining) {     string text = tabtitles[tabnumber] + "\n  (" + checkboxesremaining + " unchecked)";      actionbar.gettabat(tabnumber).settext(text); }  @override public void ontabselected(actionbar.tab tab, fragmenttransaction ft) {     viewpager.setcurrentitem(tab.getposition()); }  @override public void ontabunselected(actionbar.tab tab, fragmenttransaction ft) {  }  @override public void ontabreselected(actionbar.tab tab, fragmenttransaction ft) {  }  @override public boolean onoptionsitemselected(menuitem item) {     switch (item.getitemid()) {          case android.r.id.home:             intent intent = new intent(this, mainmenu.class);             startactivity(intent);             return true;          case r.id.complete:             dialoginterface.onclicklistener dialogclicklistener = new dialoginterface.onclicklistener() {                 @override                 public void onclick(dialoginterface dialog, int which) {                     switch (which){                         case dialoginterface.button_positive:                             gotoreport();                             break;                         case dialoginterface.button_negative:                             // "no" button clicked, nothing                             break;                     }                 }             };             alertdialog.builder builder = new alertdialog.builder(this);              builder.setmessage("are sure want complete checklist?").setpositivebutton("yes", dialogclicklistener).setnegativebutton("no", dialogclicklistener).show();             return true;          default:             return super.onoptionsitemselected(item);     } }  public void gotoreport() {     intent intent = new intent(this, report.class);     startactivity(intent); } }; 

could viewpager.setpagingenabled(false); method? try taking method out, or @ least setting true.