android endless gridview logic wrong? -

follow lazy download images gridview write code add more data after 5 row scroll.

mygridviewadater extend baseadapter seem normally. , in page include gridview:

int current_page = 0; @override     public void oncreate(bundle savedinstancestate) {       listdishentity = dishdatabase.getalldishs();   //421 size             listdishdisplay = new arraylist<dishentity>();             (int = 0; < 15; i++) {                 listdishdisplay.add(listdishentity.get(i));  // 15 component                                                            //first iniate gridview              } } 

// , display initiate data

dishimagegridviewadapter adapter = new dishimagegridviewadapter(                     mcontext, listdishdisplay, "");             adapter.notifydatasetchanged();             gridnutri.setadapter(adapter);            gridnutri.setonscrolllistener(new onscrolllistener() {              @override             public void onscrollstatechanged(abslistview view,                     int scrollstate) {              }              @override             public void onscroll(abslistview view, int firstvisibleitem,                     int visibleitemcount, int totalitemcount) {                 int lastinscreen = firstvisibleitem + visibleitemcount;                 // toast.maketext(mcontext, "lastinscreen: " + lastinscreen,                 // 1000).show();                 log.d("lastinscreen", "" + lastinscreen);         if ((lastinscreen == totalitemcount) && loadingmore) { //loadingmore iniate =false                     // fetch next batch of feeds                     log.d("totalitemcount", "" + totalitemcount);                     new loadmorephotos().execute();                 }             }         }); 

and here asytask class:

private class loadmorephotos extends asynctask {

    @override     protected void doinbackground(void... arg0) {          try {             // set loading more "true"             loadingmore = true;             log.d("loadingmore ", "" + loadingmore);             // increment current page              current_page += 1;             // next page request          } catch (exception e) {             log.d("exception ", "" + e.getmessage());         }         return null;     }      @override     protected void onpreexecute() {         // todo auto-generated method stub         // show bottom progress bar (spinner) while loading more photos         linlaprogressbar.setvisibility(view.visible);         // toast.maketext(mcontext, "cac", 1000).show();     }      @override     protected void onpostexecute(void result) {          // listview current position - used maintain scroll position         int currentposition = gridnutri.getfirstvisibleposition();          // append new data arraylist , set adapter         // listview          // listdishdisplay.clear();         (int = ((current_page - 1) * tempdishunitscroll); < current_page                 * tempdishunitscroll; i++) {             listdishdisplay.add(listdishentity.get(i));         }         log.d("current_page ", "" + current_page);         dishimagegridviewadapter adapter = new dishimagegridviewadapter(                 mcontext, listdishdisplay, "");         adapter.notifydatasetchanged();         gridnutri.setadapter(adapter);          // setting new scroll position         gridnutri.setselection(currentposition + 1);         // set loadingmore "false" after adding new feeds existing         // list         loadingmore = false;         log.d("loadingmore ", "" + loadingmore);         linlaprogressbar.setvisibility(view.gone);     }  } 

with each scroll end, show next 5 row ( 15 component). seem rune nomally 4 times. see log :

08-18 05:41:10.092: d/fapfap(1790): 9 08-18 05:41:10.112: d/onscroll loadingmore(1790): true 08-18 05:41:10.112: d/fapfap(1790): 12 08-18 05:41:10.236: d/onscroll loadingmore(1790): true 08-18 05:41:10.236: d/fapfap(1790): 12 08-18 05:41:10.248: d/onscroll loadingmore(1790): true 08-18 05:41:10.248: d/fapfap(1790): 12 08-18 05:41:10.264: d/onscroll loadingmore(1790): true 08-18 05:41:10.264: d/fapfap(1790): 12 08-18 05:41:10.276: d/onscroll loadingmore(1790): true 08-18 05:41:10.276: d/fapfap(1790): 12 08-18 05:41:10.296: d/onscroll loadingmore(1790): true 08-18 05:41:10.296: d/fapfap(1790): 12 08-18 05:41:10.316: d/onscroll loadingmore(1790): true 08-18 05:41:10.316: d/fapfap(1790): 12 08-18 05:41:10.336: d/onscroll loadingmore(1790): true 08-18 05:41:10.336: d/fapfap(1790): 15 08-18 05:41:10.336: d/totalitemcount(1790): 15 08-18 05:41:10.344: d/onscroll loadingmore(1790): true 08-18 05:41:10.344: d/loadingmore(1790): true 08-18 05:41:10.344: d/fapfap(1790): 15 08-18 05:41:10.344: d/totalitemcount(1790): 15 08-18 05:41:10.348: d/loadingmore(1790): true 08-18 05:41:10.456: d/onscroll loadingmore(1790): true 08-18 05:41:10.456: d/fapfap(1790): 15 08-18 05:41:10.456: d/totalitemcount(1790): 15 08-18 05:41:10.460: d/loadingmore(1790): true   08-18 05:41:10.468: d/current_page(1790): 2     ///// why  08-18 05:41:10.468: d/loadingmore(1790): false  /////  current_page 08-18 05:41:10.468: d/current_page(1790): 3     /////    increase continuesly? 08-18 05:41:10.468: d/loadingmore(1790): false  ///// not know why @@ 08-18 05:41:10.468: d/current_page(1790): 4     /////    08-18 05:41:10.468: d/loadingmore(1790): false 08-18 05:41:10.480: d/onscroll loadingmore(1790): false 

and max of data size 60, not 421 :(

08-18 06:02:04.476: d/onscroll loadingmore(1790): false 08-18 06:02:04.476: d/fapfap(1790): 60 08-18 06:02:04.480: d/onscroll loadingmore(1790): false 08-18 06:02:04.480: d/fapfap(1790): 60 08-18 06:02:04.480: d/onscroll loadingmore(1790): false 08-18 06:02:04.480: d/fapfap(1790): 60 08-18 06:02:04.484: d/onscroll loadingmore(1790): false 08-18 06:02:04.484: d/fapfap(1790): 60 08-18 06:02:04.568: d/onscroll loadingmore(1790): false 08-18 06:02:04.572: d/fapfap(1790): 60