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Я перепробовал все методы на Stackoverflow, но ошибка не устраняется. Пожалуйста, посмотрите на мой код и скажите мне..

Это можно сделать, но он не может вывести список. Он подключен к серверу, и данные извлекаются, но они не отображаются на экране из-за ошибки.

Там есть MainActivity.class , MainAdapter.class, activity_main.xml, book_item_list.xml Подробный код находится по адресу GitHub. https://github.com/hyeyoon98/bookSearch.git

 public class MainActivity extends AppCompatActivity {

private RetrofitClient retrofitClient;
private initMyApi initMyApi;
private ActivityMainBinding binding;
private MainAdapter adapter;
private ArrayList<Book> bookList_list = new ArrayList<Book>();

private int page = 1;
private int size = 10;
private boolean lastItemVisibleFlag = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    binding= DataBindingUtil.setContentView(this, R.layout.activity_main);

    adapter = new MainAdapter(this, bookList_list);
    binding.recyclerView.setLayoutManager(new LinearLayoutManager(this));
    binding.recyclerView.setAdapter(adapter);

    initView(page, size);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        binding.scrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {

            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                if (scrollY == v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight()) {
                    page  ;
                    binding.progressBar.setVisibility(View.VISIBLE);
                    initView(page, size);
                }
            }
        });
    }


    /*spinner*/
    //어댑터 생성
    ArrayAdapter<CharSequence> spinnerAdapter = ArrayAdapter.createFromResource(this, R.array.spinner_array,R.layout.spinner_layout);
    //드롭다운뷰 연결
    spinnerAdapter.setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
    //UI와 연결
    binding.homeSpinner.setAdapter(spinnerAdapter);
}

public void initView(int page, int size){
    retrofitClient = RetrofitClient.getInstance();
    initMyApi = RetrofitClient.getRetrofitInterface();

    initMyApi.getPageResponse("createAt", page,size).enqueue(new Callback<Page>() {
        @Override
        public void onResponse(Call<Page> call, Response<Page> response) {
            if (response.isSuccessful()amp;amp;response.body()!=null) {

                binding.progressBar.setVisibility(View.GONE);

                try {
                    JSONArray jsonArray = new JSONArray(response.body().getContent());
                    parseResult(jsonArray);
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }

        @Override
        public void onFailure(Call<Page> call, Throwable t) {
            Toast.makeText(MainActivity.this, "error", Toast.LENGTH_SHORT);
        }
    });

}

private void parseResult(JSONArray jsonArray) {
    for (int i = 0; i < jsonArray.length(); i  )
    {
        try
        {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            Book book = new Book();
            book.setId(jsonObject.getInt("id"));
            book.setImgUrl(jsonObject.getString("imgUrl"));
            book.setTitle(jsonObject.getString("title"));
            book.setAuthor(jsonObject.getString("author"));
            book.setPublisher(jsonObject.getString("publisher"));
            book.setPrice(jsonObject.getInt("price"));
            book.setCreateAt(jsonObject.getString("createAt"));
            book.setDescription(jsonObject.getString("description"));
            book.setIsbn(jsonObject.getString("isbn"));
            book.setModifiedAt(jsonObject.getString("modifiedAt"));
            bookList_list.add(book);
        }
        catch (JSONException e)
        {
            e.printStackTrace();
        }
        adapter = new MainAdapter(MainActivity.this, bookList_list);
        adapter.notifyDataSetChanged();
        binding.recyclerView.setAdapter(adapter);
    }
}



//Spinner Listener
public void spinnerListener() {
    binding.homeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

        //선택 시 작동기능
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            switch (position) {
                case 1:
                    break;
                case 2:
                    break;
                case 3:
                    break;
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });
}
}