Why am I getting java.util.ConcurrentModificationException on Android Gridview? -
i have task load images website , load them gridview. when try update mangagridarrayadapter error:
08-24 21:03:03.433 22791-22791/com.solomobile.englishmanga w/system.err﹕ java.util.concurrentmodificationexception 08-24 21:03:03.433 22791-22791/com.solomobile.englishmanga w/system.err﹕ @ java.util.abstractlist$subabstractlist.size(abstractlist.java:360) 08-24 21:03:03.434 22791-22791/com.solomobile.englishmanga w/system.err﹕ @ java.util.abstractlist$subabstractlist.addall(abstractlist.java:280) 08-24 21:03:03.434 22791-22791/com.solomobile.englishmanga w/system.err﹕ @ android.widget.arrayadapter.addall(arrayadapter.java:195) 08-24 21:03:03.434 22791-22791/com.solomobile.englishmanga w/system.err﹕ @ com.solomobile.englishmanga.task.popularmangatask.onpostexecute(popularmangatask.java:128) 08-24 21:03:03.434 22791-22791/com.solomobile.englishmanga w/system.err﹕ @ com.solomobile.englishmanga.task.popularmangatask.onpostexecute(popularmangatask.java:19) following code task:
package com.solomobile.englishmanga.task;
import android.app.activity; import android.content.context; import android.os.asynctask; import android.widget.gridview; import android.widget.abslistview; import com.solomobile.englishmanga.r; import com.solomobile.englishmanga.adapter.mangagridarrayadapter; import com.solomobile.englishmanga.controller.englishmangacontroller; import com.solomobile.englishmanga.domain.manga; import com.solomobile.englishmanga.util.util; import java.util.list; public class popularmangatask extends asynctask<context, void, void> { private activity activity = null; private mangagridarrayadapter mangagridarrayadapter = null; private list<manga> mangas = null; string erro = null; private final int max_per_page = 6; private int currentpage = 0; private static boolean loading = new boolean(false); public activity getactivity() { return activity; } public void setactivity(activity activity) { this.activity = activity; } @override protected synchronized void doinbackground(context... params) { this.activity = (activity) params[0]; if(mangas == null) { system.out.println("getting mangas first time"); englishmangacontroller controller = englishmangacontroller.getinstance(); mangas = controller.getpopularmangas(); list<manga> mangalist = mangas.sublist(currentpage * max_per_page, (currentpage * max_per_page) + max_per_page); englishmangacontroller.getinstance().definemangacover(mangalist); mangagridarrayadapter = new mangagridarrayadapter(activity, mangalist); }else{ system.out.println("loading more covers"); list<manga> mangalist = mangas.sublist(currentpage * max_per_page, (currentpage * max_per_page) + max_per_page); englishmangacontroller.getinstance().definemangacover(mangalist); } system.out.println("previous current page: " + currentpage); currentpage++; system.out.println("after current page: " + currentpage); return null; } public int getcurrentpage() { return currentpage; } public void setcurrentpage(int currentpage) { this.currentpage = currentpage; } public list<manga> getmangas() { return mangas; } public void setmangas(list<manga> mangas) { this.mangas = mangas; } public mangagridarrayadapter getmangagridarrayadapter() { return mangagridarrayadapter; } public void setmangagridarrayadapter(mangagridarrayadapter mangagridarrayadapter) { this.mangagridarrayadapter = mangagridarrayadapter; } @override protected synchronized void onpostexecute(void result) { super.onpostexecute(result); try{ gridview gridview = (gridview) activity.findviewbyid(r.id.gridviewpopular); if(gridview != null){ if(currentpage == 1) { gridview.setadapter(mangagridarrayadapter); gridview.setonscrolllistener(new abslistview.onscrolllistener() { @override public void onscrollstatechanged(abslistview view, int scrollstate) { } @override public synchronized void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) { int lastinscreen = firstvisibleitem + visibleitemcount; int maxpages = (int)(mangas.size() / max_per_page); system.out.println("scrolling - currentpage: " + currentpage + " max pages: " + maxpages + " loading: " + loading); if (!loading && lastinscreen == totalitemcount && currentpage <= maxpages) { loading = true; system.out.println("call new popular manga task: " + loading); popularmangatask popularmangatask = new popularmangatask(); popularmangatask.setcurrentpage(currentpage); popularmangatask.setmangas(mangas); popularmangatask.setmangagridarrayadapter(mangagridarrayadapter); util.startmytask(popularmangatask, activity); } } }); }else{ system.out.println("adding more mangas popular list - current page: " + currentpage); int maxsublist = (currentpage * max_per_page) + max_per_page; if(maxsublist >= mangas.size()){ maxsublist = mangas.size()-1; } system.out.println("maxsublist: " + maxsublist); system.out.println("mangas.size: " + mangas.size()); // mangagridarrayadapter = new mangagridarrayadapter(activity, mangas.sublist(0, maxsublist)); // mangagridarrayadapter.clear(); // mangagridarrayadapter.getmangas().clear(); // list<manga> sublistmanga = mangas.sublist(currentpage * max_per_page,maxsublist); list<manga> sublistmanga = mangas.sublist(8,maxsublist > mangas.size() ? mangas.size() : maxsublist); system.out.println("sublistmanga.size: " + sublistmanga.size()); mangagridarrayadapter.addall(sublistmanga); // loading = false; } } }catch (exception e){ e.printstacktrace(); } } } and here code adapter:
package com.solomobile.englishmanga.adapter; import java.util.list; import android.content.context; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.imageview; import android.widget.textview; import com.solomobile.englishmanga.r; import com.solomobile.englishmanga.controller.englishmangacontroller; import com.solomobile.englishmanga.domain.manga; import com.squareup.picasso.picasso; public class mangagridarrayadapter extends arrayadapter<manga>{ private final context context; private final list<manga> mangas; public list<manga> getmangas() { return mangas; } public mangagridarrayadapter(context context, list<manga> mangas) { super(context, r.layout.manga_grid_layout, mangas); this.context = context; this.mangas = mangas; } @override public view getview(final int position, view convertview, viewgroup parent) { layoutinflater inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service); final view rowview = inflater.inflate(r.layout.manga_grid_layout, parent, false); final manga selectedmanga = mangas.get(position); final imageview imageview = (imageview) rowview.findviewbyid(r.id.iconmanga); system.out.println("loading image: " + selectedmanga.getcoverlink()); picasso.with(context).load(selectedmanga.getcoverlink()).into(imageview); textview textview = (textview) rowview.findviewbyid(r.id.name); textview.settext(selectedmanga.getname()); return rowview; } } what doing wrong in case? have quite same code working listview, gridview i'm getting this.
how can without getting error?
add method mangagridarrayadapter
public void addallmanga(list<manga> list) { for(int = 0; < list.size(); i++) { mangas.add(list.get(i)); } notifydatasetchanged(); } in task
mangagridarrayadapter.addallmanga(sublistmanga); 
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