IndexOutOfBoundsException: in RecyclerViewAdapter

Question

java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
at com.ppl.adapter.FoodRecyclerViewAdapter.onBindViewHolder(FoodRecyclerViewAdapter.java:99) 
at com.ppl.adapter.FoodRecyclerViewAdapter.onBindViewHolder(FoodRecyclerViewAdapter.java:24) 

Was ist falsch? Plz Erklär mir das. Lebensmittel haben Daten. FoodCategory haben auch Daten.

Im Nahrungsmittelobjekt;

private Integer id; 
private String foodName; 
// etc. 
private List<FoodSize> foodSizes = new ArrayList<FoodSize>(); 

In FoodSize Objekt;

private Integer price; 
// etc 

public Integer getPrice() { 
     return price; 
    } 

In FoodRecyclerViewAdapter;

List<Food> contents;  

public void onBindViewHolder(ItemViewHolder holder, int position); 
    if (contents.get(position).getFoodSizes().get(0).getPrice() != null) { 
         holder.foodPrice.setText(contents.get(position).getFoodSizes().get(0).getPrice().toString()); 
        } 

Hier;

[ 
{ 
     "id": 1, 
     "food_name": "Chicken", 
      "food_category": { }, 
      "food_sizes": [ 
       { 
       "id": 84, 
       "size": "Normal", 
       "food_id": 1, 
       "price": 1100, 
       } 
      ] 
    } 
] 

Answer 1

public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) { 

     FoodSize mfoodSize = (FoodSize)foodSizes.get(position); 

     holder.foodPrice.setText(mfoodSize.getPrice().toString()); 

} 

Answer 2

Ich denke, Ihr Problem in getCount() Methode ist:

Schreib wie unten:

@Override 
public int getItemCount() { 
    if (contents != null) return contents.size(); 
    return 0; 
} 

Answer 3

ich es bekam.

if (contents.get(position).getFoodSizes().size() > 0) { 
        holder.foodPrice.setText(contents.get(position).getFoodSizes().get(0).getPrice().toString()); 
       } else { 
        Log.i("Price 0", " 0"); 
       }