如何从 API 获取 JSON 数组中没有名称的 JSON 对象

Question

the JSON data from the API I'm using

部分代码：我已经在代码中指出，但不知道该放什么： JSONObject volumeObj = itemsObj.getJSONObject("");在基于该 API 的“”中。我可以在代码中修改什么或放入“ ”以让我从 {0}、{1} 等获取对象？

 RequestQueue queue = Volley.newRequestQueue(MainActivity.this);


    // below line is use to make json object request inside that we
    // are passing url, get method and getting json object. .
    JsonObjectRequest booksObjrequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            progressBar.setVisibility(View.GONE);
            // inside on response method we are extracting all our json data.
            try {
                JSONArray itemsArray = response.getJSONArray("result");
                for (int i = 0; i < itemsArray.length(); i++) {
                    JSONObject itemsObj = itemsArray.getJSONObject(i);
                    **JSONObject volumeObj = itemsObj.getJSONObject("");**
                    String title = volumeObj.optString("title");
                    String subtitle = volumeObj.optString("subtitle");
                    JSONArray authorsArray = volumeObj.getJSONArray("authors");
                    String publisher = volumeObj.optString("publisher");
                    String publishedDate = volumeObj.optString("publishedDate");
                    String description = volumeObj.optString("description");

Answer 1

你想获取数组的项目吗？ “结果”数组包含这些对象，因此您可以使用索引访问它们：

for (int i = 0; i < itemsArray.length(); i++) {
    /* This is the ith object in the array */
    JSONObject volumeObj = itemsArray.getJSONObject(i);
    String title = volumeObj.optString("title");
    String subtitle = volumeObj.optString("subtitle");
    JSONArray authorsArray = volumeObj.getJSONArray("authors");
    String publisher = volumeObj.optString("publisher");
    String publishedDate = volumeObj.optString("publishedDate");
    String description = volumeObj.optString("description");
    ...
}