java - 如何在android studio中立即刷新recyclerview的组件？

Question

我有一个按钮，当单击该按钮时，我希望它自动更新文本，问题是文本来自服务器，我通过 JSON 解析它。我的问题是，如何在单击按钮时自动更新文本而不完全刷新？

JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, URL_ANSWER, (String) null, new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    listblogs = parseJSONResponseQuestion(response);
                    mAdapterQuestion.setBloglist(listblogs);
                    System.out.println(response);
                    System.out.println("it worked!!!");
                }

            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    System.out.println(error);

                }
            });
            mRequestQueue.add(request);
        }


        private ArrayList<Blogs> parseJSONResponseQuestion(JSONArray response) {
            if (!response.equals("")) {
                ArrayList<Blogs> blogsArrayList = new ArrayList<>();
                try {
                    StringBuilder data = new StringBuilder();
            for (int i = 0; i < response.length(); i++) {
                JSONObject currentQuestions = response.getJSONObject(i);
                String text = currentQuestions.getString("text");
                String questionId = currentQuestions.getString("questionId");
                String votes = currentQuestions.getString("votes");
                String Answerid = currentQuestions.getString("id");
                String selectedId = currentQuestions.getString("selected");
                System.out.println(response.length() + "length");

                data.append(text + Answerid + "\n");

                System.out.println(data);
                Blogs blogs = new Blogs();
                blogs.setMtext(text);
                blogs.setVotes(votes);
                blogs.setId(Answerid);
                blogs.setSelected(selectedId);
                System.out.print(Answerid);
                listblogs.add(blogs);
            }
            System.out.println(data.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    return listblogs;
}

我唯一尝试过的就是在监听器中调用 jsonarray

public void OnDown(View view) {
    CharSequence IdDownVote = ((TextView) ((RelativeLayout) view.getParent()).getChildAt(1)).getText();
    final RequestQueue mrequestQueue = VolleySingleton.getInstance().getRequestQueue();
    final String PUT_VOTE_DOWN = "someURL";

    StringRequest PostVoteUp = new StringRequest(Request.Method.PUT, PUT_VOTE_DOWN, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            System.out.println(response + "reponse");

        }

    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
            System.out.println("************Answer" + error + "error");
        }
    });
    mrequestQueue.add(PostVoteUp);

    System.out.println("VOTED DOWN");
}

public void ClickCardAnswer(View view) {
    System.out.println("YOU CLICKED THE CARD");
}

}

Answer 1

您的问题有点含糊，但我会尽力回答您可能遇到的两个问题:

1. 您已更新适配器中的项目，但不会显示新内容:使用适配器类的notifyItemChanged(intposition)

2. 您想要更新适配器中的项目。除了适配器类的 setBloglist() 之外，您还需要创建一个方法来更新数据集中的某个项目(通过列表中的位置或通过 id 查找 - 我通常使用 ID 版本)。更新后，参见上面第1点。