java - null pointer expetion in recycler view adapter in get item count

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65847361/null-pointer-expetion-in-recycler-view-adapter-in-get-item-count

Answer 1

try the following instead

//member declaration
private ArrayList<Book> books;

public BookRecViewAdapter(Context mcontexet , String parent) {
        this.mcontexet = mcontexet;
        this.parent = parent;
        this.books = new ArrayList<>();
    }

    @Override
    public int getItemCount() {
        return this.books.size()
    }