android - Viewpager position 0 doesnt work with onPageSelected(0) -


i cant set value start page (position 0)

i mean questionpageradapter.tv.settext("default") must work in mainactivity's onpageselected(int position) case 0: gives nullpoint. works position > 0

pageradapter:

public class questionpageradapter extends pageradapter{      public static textview tv;  @override     public object instantiateitem(view collection, int pos) {         layoutinflater inflater = (layoutinflater) collection.getcontext()                 .getsystemservice(context.layout_inflater_service);         view page = inflater.inflate(r.layout.page_quiz, null);           tv = (textview)page.findviewbyid(r.id.questiontext);   } }

mainactivity:

    @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);  @override             public void onpageselected(int position) {                 switch (position) {             case 0:       //       questionpageradapter.tv.settext("default");  => doesnt works                 break;                    default:         questionpageradapter.tv.settext("default");  =>  works                                break;      }

since have textview instance passed asynctask, can use onpreexecute() method set default value before task starts executing. onpreexecute() method runs on ui thread shouldn't issue.

http://developer.android.com/reference/android/os/asynctask.html#onpreexecute()


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