我用customarrayadapter创建了arraylist，在使用模拟数据时，列表在屏幕上是可见的，没有任何错误，但是当我用jsonobject替换模拟数据时，json响应在java文件中被硬编码为字符串值，然后我发现所有数据都正确地显示在列表中，但是只有1个列表项显示在屏幕上，而不是15个，因为响应包含15个jsonarray对象。我使用for循环遍历jsonarray，但是我不知道错误是什么？

mainactivity.java:

package com.example.anybookinfo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView bookListView = findViewById(R.id.bookListView);
        ArrayList<BookStore> bookStoreArrayList = HTTTP_REQUEST.readFromJson(HTTTP_REQUEST.jsonResponse);

        BookAdapter bookAdapter = new BookAdapter(this, bookStoreArrayList);

        bookListView.setAdapter(bookAdapter);
    }
}

http\ U请求.java：

package com.example.anybookinfo;

import android.text.TextUtils;
import android.util.Log;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public final class HTTTP_REQUEST {
public static ArrayList<BookStore> readFromJson(String jsonObject) {
        ArrayList<BookStore> currentBookStore = new ArrayList<>();
        if (TextUtils.isEmpty(jsonObject)) {
            return null;
        }
        try {
            JSONObject root = new JSONObject(jsonObject);
            JSONArray items = root.getJSONArray("items");
            for (int i = 0; i < items.length(); i++) {
                JSONObject currentBook = items.getJSONObject(i);
                JSONObject volumeInfo = currentBook.getJSONObject("volumeInfo");
                String fTitle = volumeInfo.getString("title");
                String lTitle = volumeInfo.getString("subtitle");
                JSONArray author = volumeInfo.getJSONArray("authors");
                String authorName = author.getString(0);
                int PageCount = volumeInfo.getInt("pageCount");
                JSONObject saleInfo = currentBook.getJSONObject("saleInfo");
                JSONObject listPrice = saleInfo.getJSONObject("listPrice");
                double amount = listPrice.getDouble("amount");
                String currencyCode = listPrice.getString("currencyCode");
                JSONObject searchInfo = currentBook.getJSONObject("searchInfo");
                String textSnippet = searchInfo.getString("textSnippet");
                BookStore bookStore = new BookStore(fTitle, lTitle, authorName, textSnippet, PageCount, amount, currencyCode);
                currentBookStore.add(bookStore);
            }
        } catch (JSONException j) {
            Log.e("readFromJson Error", "error in reading the json response", j);
        }
        return currentBookStore;
    }
 public static final String jsonResponse = "  //the json response code is here " ;
}

硬编码的实际json响应链接：https://www.googleapis.com/books/v1/volumes?q=inner%20engineering%20用法：%20a%20yogi%27s%20guide%20to%20joy&maxresults=15
logcat错误：

01-24 23:18:46.030 3693-3703/? E/art: Failed sending reply to debugger: Broken pipe
01-24 23:18:46.243 3693-3693/? E/readFromJson Error: error in reading the json response
    org.json.JSONException: No value for listPrice
        at org.json.JSONObject.get(JSONObject.java:389)
com.example.anybookinfo.HTTTP_REQUEST.readFromJson(HTTTP_REQUEST.java:58)
        at com.example.anybookinfo.MainActivity.onCreate(MainActivity.java:18)

主要活动。java:18 line 包含：

ArrayList<BookStore> bookStoreArrayList = HTTTP_REQUEST.readFromJson(HTTTP_REQUEST.jsonResponse);

htttp\u请求。java:58 line 包含：

JSONObject listPrice = saleInfo.getJSONObject("listPrice");