列表中的最后一个项目<对象>在RecyclerView项目的特定文本视图中重复 [英] Last Item in List<Object> is repeated in a specific textview of RecyclerView item
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问题描述
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。应用程序的流程如下。
步骤1：（MainActivity.class）
从服务器获取数据
步骤2：
Json数据转换为 List< Object> 类。并在MainActivity
List< Object> 作为 public static 步骤3：
这里我需要将 List< Object> 类值填入Recyclerview。由于声明为公共静态，所以我直接调用这个方法，在适配器中设置一个MainActivity作为父级的片段。
adapter = new CardAdapter（MainActivity.res，context）;
recyclelerView.setAdapter（adapter）;
adapter.notifyDataSetChanged（）;
但问题是在填充RecyclerView时，我只得到最后一个项目被重复直到 列表<餐厅> 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））;
字符串;
while（（line = br.readLine（））！= null）
buffer.append（line）.append（\r\\\
）;
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（）; （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 =餐厅;
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（）;
}
}
}
返回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（）;
}
}
这里只重复RED舍入的数据，其他数据与正确的数据相关。 / strong>
我也发贴了我的代码。请检查。
解决方案
自己修复错误。我已经改变的是我将每个变量（ Product Name，CategoryName ）设置为 List< Object> class中的public static String。 p>
删除静态后，我得到了确切的结果。我的 RecyclerView 被改编为完美的。
而不是
public static String ProductName;
使用此
code> public String ProductName;
I am using Object class( public static List<Restaurant> res;) to set data that I am getting json data from server. The flow of the app is as follow.
Step 1: (MainActivity.class)
Getting data from server
Step 2:
Set all the Json data into List<Object> class. And declared List<Object> as a public static in MainActivity
Step 3:
Here I need to populate List<Object> class values into the Recyclerview.Due to declared as public static, I called this directly while setting in adapter in a fragment which has a MainActivity as a parent.
adapter = new CardAdapter(MainActivity.res, context);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
But the issue is that while populating RecyclerView,I am getting only the last Item is repeated upto the List<Restaurant> size.
MainActivity (AsyncTask Method):
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();
}
}
Here only the RED rounderd data is repeated and the other data are relevant to the correct data.
I have posted my code too.Please check it.
解决方案
Fixed bug by myself. What I have changed is that I had set every variable(Product Name,CategoryName) as public static String in List<Object> class.
After removing static I got the exact result.My RecyclerView is adapted as perfect.Like the following
Instead of
public static String ProductName;
use this
public String ProductName;
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