问题
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.
回答1:
send list object with CardAdapter Constructor
new CardAdapter(MainActivity.res, context, List<object> abc);
then use it.
回答2:
Your code has a "referencing" problem. Move Restaurant item= new Restaurant(); inside the loop. Like this:
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");
}
}
回答3:
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;
来源：https://stackoverflow.com/questions/36257644/last-item-in-listobject-is-repeated-in-a-specific-textview-of-recyclerview-ite