android - First viewpager page blank -


i have problem relates android's viewpager. attempting implement verticalviewpager (though not relevant problem same problem occurs normal viewpager) custom pageradapter gets stuff database , inputs onto screen.

the problem first card appears blank until slide on next page , come back. after content there. i'm not sure going on can shed light on issue. found similar problem here: why first view in viewpager appearing empty? , activity using viewpager, pageradapter , asynctask causes blank view seems if nothing in there able me.

this custom pageradapter code:

public class beginnercardcursorpageradapter extends pageradapter {     private cursor cursor;     private layoutinflater inflater;      public beginnercardcursorpageradapter(context context, cursor cursor){         this.cursor = cursor;         this.inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);     }      public void swapcursor(cursor cursor){         this.cursor = cursor;     }      @override     public void destroyitem(view view, int position, object object) {         ((verticalviewpager) view).removeview((relativelayout) object);     }      @override     public int getcount() {         if(cursor == null) {             return 0;         } else {             return 90;         }     }      @override     public object instantiateitem(view view, int position) {         relativelayout layout = null;         int position2 = position;         if(position == 0){             layout = (relativelayout) inflater.inflate(r.layout.activity_slide_info, null);         }if(position == 89){             layout = (relativelayout) inflater.inflate(r.layout.activity_advertisement_beginner, null);         }         else if(position > 0 && position < 89){             position2--;             cursor.movetoposition(position2);             layout = (relativelayout) inflater.inflate(r.layout.activity_card, null);             layout.setbackgroundresource(r.drawable.card_beginner);             textview cardtitle = (textview) layout.findviewbyid(r.id.pirate_card_title);             textview cardexample = (textview) layout.findviewbyid(r.id.pirate_card_example);             textview carddefinition = (textview) layout.findviewbyid(r.id.pirate_card_definition);              cardtitle.settext(cursor.getstring(cursor.getcolumnindex(flashcardtable.column_title)));             cardexample.settext(cursor.getstring(cursor.getcolumnindex(flashcardtable.column_sentence)));             carddefinition.settext(cursor.getstring(cursor.getcolumnindex(flashcardtable.column_definition)));         }         ((verticalviewpager) view).addview(layout);         return layout;     }      @override     public boolean isviewfromobject(view arg0, object arg1) {         return arg0 == arg1;     } }

the issue must because card taking time load data database , view not updated after data being loaded.try adding

 handler.postdelayed(r=new runnable()         {             @override             public void run() {                 if (mposition == position)                 {                      notifydatasetchanged();                    handler.removecallbacks(r);                   }             }         }, 1000);

inside instantiateitem of adapter view updated after 1 second when being created.mposition postion of first card being opened.if opening viewpager clicking on item in list need pass postion of item being selected when calling adapter..else u can set mpostion 0 if first item opened in viewpager


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