android - Update recycle view -


i have trouble recycleview. want update recycleview using diffutil. can't understand why not work. diffutil

public class consumablediffcallback extends diffutil.callback {  private list<consumablebytask> oldlistofconsumablebytask; private list<consumablebytask> newlistofconsumablebytask;  @override public boolean areitemsthesame(int olditemposition, int newitemposition) {     return oldlistofconsumablebytask.get(olditemposition).getquantity() != newlistofconsumablebytask.get(newitemposition).getquantity(); }  @override public boolean arecontentsthesame(int olditemposition, int newitemposition) {     return oldlistofconsumablebytask.get(olditemposition).equals(newlistofconsumablebytask.get(newitemposition)); }}

my adapter holder

    public class consumeholder extends recyclerview.viewholder {      private button addconsumebtn;      public consumeholder(view itemview) {         /**          * add/change data , send server.          * after close consumablesbytaskactivity.          */         addconsumebtn.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 //do                  listener.senddataandcloseframe();             }         });}}

update method in adapter class

public void updatelist(list<consumablebytask> list){     final consumablediffcallback consumablediffcallback = new consumablediffcallback(this.consumablebytasklist,list);     final diffutil.diffresult diffresult = diffutil.calculatediff(consumablediffcallback);      this.consumablebytasklist.clear();     this.consumablebytasklist.addall(list);      diffresult.dispatchupdatesto(this); }

activity method

public void senddataandcloseframe() {     list<consumablebytask> listofconsumable = //get new list server;      adapter.updatelist(listofconsumable);       finish(); }

thanks.

i'm using in recycleradapater

private list<bindableassignment> databaseitemlist;  public void setitems(final list<bindableassignment> argumentlist) {     if (databaseitemlist == null) {         databaseitemlist = argumentlist;         notifyitemrangechanged(0, databaseitemlist.size());     } else {         diffutil.diffresult result = diffutil.calculatediff(new diffutil.callback() {             @override             public int getoldlistsize() {                 return databaseitemlist.size();             }              @override             public int getnewlistsize() {                 return argumentlist.size();             }              @override             public boolean areitemsthesame(int olditemposition, int newitemposition) {                 return databaseitemlist.get(olditemposition).getid() == argumentlist.get(newitemposition).getid();             }              @override             public boolean arecontentsthesame(int olditemposition, int newitemposition) {                 bindableassignment olditem = databaseitemlist.get(olditemposition);                 bindableassignment newitem = argumentlist.get(newitemposition);                 // change apply object                 return olditem.getid() == newitem.getid()                         && olditem.getname().equals(newitem.getname())                         && (olditem.getdesc() != null && newitem.getdesc() != null) && olditem.getdesc().equals(newitem.getdesc())                         && olditem.getclassid() == newitem.getclassid()                         && olditem.getduetime() == newitem.getduetime();             }         });         databaseitemlist = argumentlist;         result.dispatchupdatesto(this);     }     log.d("databindingadapter", "changing data " + databaseitemlist.size() + " elements"); }

hopefully works you.


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