android - onPageSelected doesn't work for first page -


my pager adapter ( extends pageradepter ) has textview in it. , update textview mainactivity's onpageselected . update textview position > 0 , start page (position 0) doesn't update on startup. when swipe forward swipe back; sets value position 0 couldnt set value on start. how can set value star page ?

public void onpageselected(int position) {               switch (position) {                 case 0:                        pageradapter.tv.settext("value"); // => doesnt work on start                      break;                              default:                                    pageradapter.tv.settext("value");                                          break; } }

full code:

public class quizstart extends slidingfragmentactivity {  @override         protected void oncreate(final bundle savedinstancestate) {             super.oncreate(savedinstancestate);             this.setcontentview(r.layout.activity_main);                mpager = (viewpager)findviewbyid(r.id.pager);                      questionpageradapter madapter = new questionpageradapter();              mpager.setadapter(madapter);             quizstart.onpageselected(0);           mpager.setonpagechangelistener(new onpagechangelistener() {               @override             public void onpagescrollstatechanged(int arg0) { }              @override             public void onpagescrolled(int arg0, float arg1, int arg2) { }              @override             public void onpageselected(int position) {               switch (position) {                 case 0:                        pageradapter.tv.settext("value"); // => doesnt work on start                      break;                              default:                                    pageradapter.tv.settext("value");                                          break;                 }             }          }); } }

you can manually call onpageselected(0) when create onpagechangelistener set starting state:

onpagechangelistener pagechangelistener = new onpagechangelistener() {     @override     public void onpagescrollstatechanged(int arg0) { }      @override     public void onpagescrolled(int arg0, float arg1, int arg2) { }      @override     public void onpageselected(int position) {          switch (position) {         case 0:              quizstart.next.settext(getmycurrentpage()+"");             break;          default:              quizstart.next.settext(getmycurrentpage()+"");             break;         }     } });     mpager.setonpagechangelistener(pagechangelistener);    // in runnable make sure viewpager's views instantiated before triggering onpageselected call    mpager.post(new runnable()    {        @override        public void run()         {            pagechangelistener .onpageselected(viewpager.getcurrentitem());        }    });

edit

now not null pointer exception pointed @metemet06


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