Question

我正在使用Object类（public static List<Restaurant> res;）来设置我从服务器获取json数据的数据。该应用程序的流程如下。

第1步：（MainActivity.class）

从服务器获取数据

第2步：

将所有Json数据设置为List<Object>类。并在MainActivity中将List<Object>声明为公共静态

第3步：

这里我需要将List<Object>类值填充到Recyclerview.Due中以声明为public static，我在将适配器设置为具有MainActivity作为父级的片段时直接调用它。

  adapter = new CardAdapter(MainActivity.res, context);
  recyclerView.setAdapter(adapter);
  adapter.notifyDataSetChanged();

但问题是，在填充RecyclerView时，我只会重复最后一项，直到 List<Restaurant> 大小。

MainActivity（AsyncTask方法）：

 private class TabNameSync extends AsyncTask<Void, Void, String> {
        String BASE_URL = Config.DATA_URL;
        ProgressDialog nDialog;
        HashMap<String, String> hashMapPost = new HashMap<>();

        @Override
        protected void onPreExecute() {
            nDialog = new ProgressDialog(MainActivity.this);
            nDialog.setMessage("Loading...");
            nDialog.setIndeterminate(true);
            nDialog.setCancelable(true);
            nDialog.show();
        }

        @Override

        protected String doInBackground(Void... params) {

            HttpURLConnection con = null;
            InputStream is = null;

            StringBuffer buffer;
            String bufferVariable = null;

            hashMapPost.put("tag", "onload");
            hashMapPost.put("lat", "18.71851808");
            hashMapPost.put("log", "97.74131474");

            try {
                con = (HttpURLConnection) (new URL(BASE_URL)).openConnection();
                con.setDoInput(true);
                con.setDoOutput(true);
                con.setRequestMethod("POST");
                con.connect();
                OutputStream os = con.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));
                writer.write(commonUtil.getPostDataString(hashMapPost));

                writer.flush();
                writer.close();
                os.close();

                buffer = new StringBuffer();
                int responseCode = con.getResponseCode();
                if (responseCode == HttpsURLConnection.HTTP_OK) {
                    is = con.getInputStream();
                    BufferedReader br = new BufferedReader(new InputStreamReader(is));
                    String line;
                    while ((line = br.readLine()) != null)
                        buffer.append(line).append("\r\n");
                    is.close();
                }
                con.disconnect();
                bufferVariable = buffer.toString();
                return buffer.toString();
            } catch (Throwable t) {
                t.printStackTrace();
            } finally {
                try {
                    if (is != null) {
                        is.close();
                    }
                } catch (Throwable t) {
                }
                try {
                    if (con != null) {
                        con.disconnect();
                    }
                } catch (Throwable t) {
                }
                if (!bufferVariable.equalsIgnoreCase(" ")) {
                    try {

                        JSONArray jArray = new JSONArray(bufferVariable);
                        int jsonLength = jArray.length();

                        for (int j = 0; j < jArray.length(); j++) {

                            Restaurant_Beam item;
                            JSONObject jsonObj = jArray.getJSONObject(j);
                            item = new Restaurant_Beam();
                            item.setIG_LIKECOUNT(jsonObj.getInt(Config.LIKE));
                            item.setIG_DELIVERY(jsonObj.getInt(Config.DELIVERYTIME));
                            item.setIG_PRODUCTID(jsonObj.getString(Config.PRODUCTID));
                            item.setIG_SALES_PRICE(jsonObj.getString(Config.SALESPRICE));
                            item.setIG_VOUCHER_ID(jsonObj.getString(Config.VOUCHERID));
                            item.setIG_VOUCHEROFFER(jsonObj.getString(Config.VOUCHEROFFER));
                            item.setIG_CATEGORY_ID(jsonObj.getString(Config.CATEID));
                            item.setIG_IMAGEURL(jsonObj.getString(Config.IMGID));
                            item.setIG_PRODUCTNAME(jsonObj.getString(Config.PRODUCTNAME));
                            item.setIG_CATEGORYNAME(jsonObj.getString(Config.CATENAME));

                            Restaurant.add(item);

                            listSuperHeroes = Restaurant;

                            strTabName = jsonObj.getString("Cate Name");
                            String strProductID = jsonObj.getString("Pro_Id");
                            String strProductName = jsonObj.getString("Product_Name");
                            String strSalesPrice = jsonObj.getString("Sales Price");
                            String strVoucherId = jsonObj.getString("Voucher Id");
                            String strVoucherOffer = jsonObj.getString("voucher Offer");
                            String strCatId = jsonObj.getString("Cat Id");
                            String strImage = jsonObj.getString("Image");
                            String strLikes = jsonObj.getString("likes");
                            String strDeliveryTime = jsonObj.getString("deliverytime");
                            strDbName = jsonObj.getString("dbname");


                            tabName.add(strTabName);

                            DbName.add(strDbName);

                            if (jsonLength == jArray.length()) {
                                JSONObject jsonObj2 = jArray.getJSONObject(jsonLength - 1);
                                Config.IMAGE_URL = jsonObj2.getString("url");
                            }
                        }


                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            final TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
            tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);

            values = new ArrayList<String>();
            values = tabName;
            HashSet<String> hashSet = new HashSet<String>();
            hashSet.addAll(values);
            values.clear();
            values.addAll(hashSet);

            nDialog.dismiss();

            //    setTime_ToSlide();
            viewPager.setAdapter(new ViewPagerAdapter(getSupportFragmentManager()));
            tabLayout.post(new Runnable() {
                @Override
                public void run() {
                    tabLayout.setupWithViewPager(viewPager);
                }
            });
            SharedPreferences.Editor editor = pref.edit();
            editor.putString("FIRST_TAB", values.get(1));
            editor.putString("SECOND_TAB", values.get(0));
            editor.putString("THIRD_TAB", values.get(2));
            editor.commit();

        }
    }

此处仅重复RED更改的数据，其他数据与正确的数据相关。

我也发布了我的代码。请检查一下。

Answer 1

使用CardAdapter构造函数发送列表对象

new CardAdapter(MainActivity.res, context, List<object> abc);

然后使用它。

Answer 2

您的代码存在“引用”问题。在循环内移动Restaurant item= new Restaurant();。像这样：

public static List<Restaurant> res;
     try {
                            JSONArray jArray = new JSONArray(bufferVariable);
                            int jsonLength = jArray.length();
                            for (int j = 0; j < jArray.length(); j++) {
                                JSONObject jsonObj = jArray.getJSONObject(j);

                                strTabName = jsonObj.getString("Cate Name");
                                Restaurant item= new Restaurant();

                                item.setIG_LIKECOUNT(jsonObj.getInt(Config.LIKE));
                                item.setIG_DELIVERY(jsonObj.getInt(Config.DELIVERYTIME));
                                item.setIG_PRODUCTID(jsonObj.getString(Config.PRODUCTID));
                                item.setIG_PRODUCTNAME(jsonObj.getString(Config.PRODUCTNAME));
                                item.setIG_SALES_PRICE(jsonObj.getString(Config.SALESPRICE));
                                item.setIG_VOUCHER_ID(jsonObj.getString(Config.VOUCHERID));
                                item.setIG_VOUCHEROFFER(jsonObj.getString(Config.VOUCHEROFFER));
                                item.setIG_CATEGORY_ID(jsonObj.getString(Config.CATEID));
                                item.setIG_CATEGORYNAME(jsonObj.getString(Config.CATENAME));
                                item.setIG_IMAGEURL(jsonObj.getString(Config.IMGID));

                                res.add(item);

                                if (jsonLength == jArray.length()) {
                                    JSONObject jsonObj2 = jArray.getJSONObject(jsonLength - 1);
                                    Config.IMAGE_URL = jsonObj2.getString("url");
                                }
                            }

Answer 3

我自己修复了错误。我更改的是我已将每个变量（产品名称，CategoryName ）设置为List<Object>类中的公共静态字符串。

删除静态后，我得到了确切的结果。我的 RecyclerView 被改编为完美。如下所示

而不是

public static String ProductName;

使用此

public String ProductName;

List <object>中的最后一项在RecyclerView项的特定textview中重复

3 个答案: