method getItemcount in adapter of recylerview

Question

here code is Of the class

public class AdapterOrderShop extends 
RecyclerView.Adapter<AdapterOrderShop.HolderOrderShop>
implements Filterable {

private Context context;
public ArrayList<ModelOrderShop> orderShopArrayList,filterList;
private FilterOrderShop filter;

 public AdapterOrderShop(Context context, ArrayList<ModelOrderShop> orderShopArrayList) {
    this.context = context;
    this.orderShopArrayList = orderShopArrayList;

    this.filterList=orderShopArrayList;
}

@Override
public int getItemCount() {
     return orderShopArrayList.size();
}

Attempt to invoke virtual method 'int java.util.ArrayList.size()' on a null object reference

As the error says, You didn't set the list and it is null. Are You passing a list in the constructor to the Adapter? You have to init `orderShopArrayList` in some way. Maybe show full adapter class and a place where You create it and someone will help You, now I think it is impossible — iknow, Nov 12 '20 at 10:35

score 0 · Answer 1 · answered Nov 12 '20 at 10:40

0

You should initialize your list in the adapter constructor and the problem is solved. Uninitialized list return the null that why this error occur. You can create the constructor in adapter and then the list passing from the activity or fragment assign to the list declare in the adapter. If you are passing the context from the activity or fragment then you have the same constructor just like below but if you are not passing the context then remove the Context parameter from the constructor.

public YourAdapterName(Context mCtx, List<YourModelClassName> taskList) {
    this.mCtx = mCtx;
    this.orderShopArrayList= taskList;
}

answered Nov 12 '20 at 10:40

Syed Rafaqat Hussain

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public AdapterOrderShop(Context context, ArrayList orderShopArrayList) { this.context = context; this.orderShopArrayList = orderShopArrayList; this.filterList=orderShopArrayList; } We worked the code but the problem remained – mahmoud ad Nov 12 '20 at 10:44
update your question with full adapter code or the list passing from the activity. then it will be clear to trace the problem. – Syed Rafaqat Hussain Nov 12 '20 at 10:50
Iam udate the Question – mahmoud ad Nov 12 '20 at 11:31
add the code from where you passing the list to the adapter – Syed Rafaqat Hussain Nov 12 '20 at 11:40
Activity code from where you passing the list to the recyclerview adapter i wants that one. – Syed Rafaqat Hussain Nov 12 '20 at 12:15
the code is update – mahmoud ad Nov 12 '20 at 12:17
bro you did not getting my point i wants activity code bro – Syed Rafaqat Hussain Nov 12 '20 at 12:19
what is the soultion https://stackoverflow.com/questions/64803870/push-notification-with-fcm-by-topic-android – mahmoud ad Nov 19 '20 at 20:00

method getItemcount in adapter of recylerview

1 Answers1