Develop Reference

Why am I getting duplicated items on loading more data in RecyclerView?

So I am using Volley to get data from Thinkspeak.com API which has limit results to display the data to JSON format.
Here are the results from the Thinkspeak.com API:
{
"channel": {
"id": "channel_id",
"name": "SISTEM FDRS",
"latitude": "lat",
"longitude": "long",
"field1": "Field Label 1",
"field2": "Field Label 2",
"field3": "Field Label 3",
"field4": "Field Label 4",
"field5": "Field Label 5",
"field6": "Field Label 6",
"created_at": "2019-01-20T02:01:36Z",
"updated_at": "2019-06-27T08:06:29Z",
"last_entry_id": 115
},
"feeds": [{
"created_at": "2019-07-05T10:36:02Z",
"entry_id": 106,
"field1": "31.20",
"field2": "64.30",
"field3": "0.00",
"field4": "2.95",
"field5": "86",
"field6": "2"
},
{
"created_at": "2019-07-05T10:36:50Z",
"entry_id": 107,
"field1": "31.20",
"field2": "64.67",
"field3": "0.00",
"field4": "2.41",
"field5": "86",
"field6": "2"
},
/* ... and so on .. */
]
}
I was able to increase the limit as the end of RecyclerView has been reached by using an addOnScrollListener method.
But the data displayed in RecyclerView are duplicated and I have no idea why.
Here's the Activity code:
public class FFMCActivity extends AppCompatActivity {
private List < Feed > feedList;
private RecyclerView recyclerView;
private String url = "https://api.thingspeak.com/channels/id/feeds.json?api_key=api_key&results=";
private int load_results = 1;
AdapterFFMC adapterFFMC;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ffmc);
recyclerView = findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
feedList = new ArrayList < > ();
adapterFFMC = new AdapterFFMC(feedList);
recyclerView.setAdapter(adapterFFMC);
getData(load_results);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (recyclerView.getAdapter().getItemCount() != 0) {
int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1) {
getData(load_results++);
Toast.makeText(FFMCActivity.this, "Data loaded: " + load_results, Toast.LENGTH_SHORT).show();
}
}
}
});
}
private void getData(int results) {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
Request.Method.GET, url + results,
null,
new Response.Listener < JSONObject > () {
#Override
public void onResponse(JSONObject response) {
JSONArray Jarray = null;
try {
Jarray = response.getJSONArray("feeds");
for (int i = 0; i < Jarray.length(); i++) {
JSONObject feed = Jarray.getJSONObject(i);
feedList.add(new Feed(
feed.getString("created_at"),
feed.getString("entry_id"),
feed.getString("field1"),
feed.getString("field2"),
feed.getString("field3"),
feed.getString("field4"),
feed.getString("field5"),
feed.getString("field6")
));
}
Collections.sort(feedList, new Comparator < Feed > () {
#Override
public int compare(Feed feed1, Feed feed2) {
if (Integer.parseInt(feed1.getEntry_id()) > Integer.parseInt(feed2.getEntry_id())) {
return -1;
} else {
return 1;
}
}
});
adapterFFMC.notifyDataSetChanged();
} catch (JSONException e) {
Log.e("VolleyError", "JSON Parsing Error: " + e.getMessage());
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("VolleyError", "JSON Response Error: " + error.getMessage());
}
}
);
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonObjectRequest);
}
}
And here's the Adapter code:
public class AdapterFFMC extends RecyclerView.Adapter < AdapterFFMC.ViewHolder > {
private List < Feed > dataFFMC;
public AdapterFFMC(List < Feed > dataFFMC) {
this.dataFFMC = dataFFMC;
}
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_ffmc, parent, false);
ViewHolder holder = new ViewHolder(v);
return holder;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
Feed feed = dataFFMC.get(position);
holder.created_at.setText(feed.getCreated_at());
holder.created_day.setText(feed.getCreated_at());
holder.entry_id.setText(feed.getEntry_id());
holder.field_1.setText(feed.getField_1());
holder.field_2.setText(feed.getField_2());
holder.field_3.setText(feed.getField_3());
holder.field_4.setText(feed.getField_4());
holder.field_5.setText(feed.getField_5());
holder.field_6.setText(feed.getField_6());
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getItemCount() {
return dataFFMC.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView created_at, created_day, entry_id, field_1, field_2, field_3, field_4, field_5, field_6;
public ViewHolder(View itemView) {
super(itemView);
created_at = itemView.findViewById(R.id.created_at);
created_day = itemView.findViewById(R.id.created_day);
entry_id = itemView.findViewById(R.id.entry_id);
field_1 = itemView.findViewById(R.id.field_1);
field_2 = itemView.findViewById(R.id.field_2);
field_3 = itemView.findViewById(R.id.field_3);
field_4 = itemView.findViewById(R.id.field_4);
field_5 = itemView.findViewById(R.id.field_5);
field_6 = itemView.findViewById(R.id.field_6);
}
}
}
How do I prevent duplicate results from the code above?
Any help will be much appreciated
Thank you.

Change the sequence of your code to this.
feedList = new ArrayList < > ();
getData(load_results);
adapterFFMC = new AdapterFFMC(feedList);
recyclerView.setAdapter(adapterFFMC);
You are initializing array after setting it's adapter.

Troubles with JSON parsing

I'm working on a simple news app.
I need to fetch data from a remote server in JSON format then put it in view. I use TabLayout and recyclerView to display data categories and Volley for the query no API here.
The TabLayout is set automatically depending on data from JSON where I extract tabs title and the content of every tab is being displayed on recyclerView (Article title, image, content, links...) and rendered inside a fragment
I spent several hours trying to debug it without success., but whatever I do, no data is being displayed. Not sure what I'm doing wrong.
I know this is not the right place to ask for such things, but I'm a bit of a desperate and would need some experienced developer than me look at my problem.
How it works:
Activity launches BaseArticleFragment which calls a method that loads contents categories and bind the data to the views:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.fm = getSupportFragmentManager();
this.baseArticleFragment = new BaseArticleFragment();
FragmentTransaction ft = this.fm.beginTransaction();
ft.add(R.id.fragment_container, this.baseArticleFragment, TAB_LAYOUT_FRAGMENT_TAG);
ft.commit();
}
When launched, baseArticleFragment calls loadCategories() method inside its onActivityCreated() method:
#Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
loadCategories();
}
here is the loadCategories() method:
private void loadCategories(){
String url = "http://somesite.com/categories"; //link to grab the json data
ApplicationController.getInstance().addToRequestQueue(
new JsonObjectRequest(0, url, null, new Listener<JSONObject>() { //0 is the Volley code for GET method
#Override
public void onResponse(JSONObject jsonObject) {
BaseArticleFragment.categories = JSONParser.parseCategories(jsonObject);
BaseArticleFragment.this.mViewPager.setAdapter(
new RecyclerViewFragmentPagerAdapter(BaseArticleFragment.this.getChildFragmentManager(),
BaseArticleFragment.categories));
BaseArticleFragment.this.mTabLayout.setupWithViewPager(BaseArticleFragment.this.mViewPager);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError vError){
Log.d("BaseArticleFragment", "---Volley Error---");
Snackbar.make(BaseArticleFragment.this.mTabLayout, R.string.error_load_categories, Snackbar.LENGTH_SHORT)
.setAction(R.string.action_retry, new View.OnClickListener() {
#Override
public void onClick(View v) {
BaseArticleFragment.this.loadCategories();
}
}).show();
}
}));
}
I guess the problem may be with the query but not sure cause I think my logic here is good
EDIT :
Here is the JSON data I need to fetch:
[
{
"name": "Topic 1",
"tid": "2",
},
{
"name": "Topic 2",
"tid": "3",
},
{
"name": "Topic 3",
"tid": "4",
},
{
"name": "Topic 4",
"tid": "5",
},
{
"name": "Topic 5",
"tid": "6",
},
{
"name": "Topic 6",
"tid": "1415",
},
{
"name": "Topic 7",
"tid": "1414",
},
{
"name": "Topic 8",
"tid": "1298",
},
{
"name": "Topic 9",
"tid": "1301",
},
{
"name": "Topic 10",
"tid": "1299",
},
{
"name": "Topic 11",
"tid": "1302",
},
{
"name": "Topic 12",
"tid": "1300",
},
{
"name": "Topic 13",
"tid": "1297",
}
]
Edit 2:
I forget to paste the code for parseCategories() in my JSONPArser class
public static ArrayList<Category> parseCategories(JSONObject jsonObject) {
ArrayList<Category> categoryArrayList = new ArrayList<>();
try {
JSONArray categories = jsonObject.getJSONArray("categories");
Category all = new Category();
all.setTid("0");
all.setName(ApplicationController.getInstance().getString(R.string.tab_all));
categoryArrayList.add(all);
for (int i = 0; i < categories.length(); i++) {
JSONObject catObject = categories.getJSONObject(i);
Category category = new Category();
category.setTid(catObject.getString("tid"));
category.setName(catObject.getString("name"));
categoryArrayList.add(category);
}
return categoryArrayList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}

Try this #esQmo_,
StringRequest stringRequest = new StringRequest(url , new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
ArrayList<Hashmap<String,String>> arraylist = new
ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
HashMap<String, String> hashMap = new HashMap<>();
String name =
jsonArray.getJSONObject(i).getString("name");
String tid =
jsonArray.getJSONObject(i).getString("tid");
hashMap.put("name", name);
hashMap.put("tid ", tid );
arraylist.add(hashMap);
Log.e("response",name + "\n" + tid);
}
attachAdapter(arraylist);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(stringRequest);
//setting adapter data to the RecyclerView
private void attachAdapter(ArrayList<HashMap<String, String>>
arrayList) {
ExampleAdapter adapter = new ExampleAdapter(arrayList,this);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
This is the adapter class
public class ExampleAdpater extends RecyclerView.Adapter<ExampleAdpater.ExampleViewHolder>{
public ArrayList<HashMap<String,String>> arraylist;
public Context context;
public ExampleAdpater(ArrayList<HashMap<String, String>> arraylist, Context context) {
this.arraylist= arraylist;
this.context = context;
}
#NonNull
#Override
public ExampleViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.textLayout,viewGroup,false);
return new ExampleViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ExampleViewHolder viewHolder, int i) {
HashMap<String,String> hashMap = arraylist.get(i);
viewHolder.name.setText(hashMap.get("name"));
viewHolder.tid.setText(hashMap.get("tid"));
}
#Override
public int getItemCount() {
return arraylist.size();
}
public class ExampleViewHolder extends RecyclerView.ViewHolder{
TextView name,tid;
public ExampleViewHolder(#NonNull View itemView) {
super(itemView);
name = itemView.findViewById(R.id.name);
tid = itemView.findViewById(R.id.tid);
name.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(v.getContext(), ""+name.getText().toString(),
Toast.LENGTH_SHORT).show();
}
});
}
}
}
textLayout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/name"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tid"
/>
</LinearLayout>

You forgot to add this thing at the end of the "load" method:
Volley.newRequestQueue(this).add(jsonRequest);
Try to add it...
Instead of using new RequestQueue, please use RequestQueue jsonQueue = new RequestQueue
Like this:
RequestQueue requestQueue = Volley.newRequestQueue(this);
String url = "https://someurl.com/api";
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
JSONArray ja = new JSONArray(response);
for(int i = 0; i < ja.length(); i++)
{
JSONObject jo = ja.get(i);
String name = jo.getString("name");
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("LOG", error.toString());
}
});
requestQueue.add(jsonObjectRequest);

Just check if you have set LayoutManager for recyclerView
recyclerView.setLayoutManager(new LinearLayoutManager(MyActivity.this));

Can we have your code and JSON data too? Since we can't read what's on your mind or on your computer... Plase make some edits to your post, add code and json data so we may help you.

Since you are getting a timeout error you can change the timeout value so that it will be willing to wait longer.
Try something like this:
jsonObjectRequest.setRetryPolicy(new DefaultRetryPolicy(
MY_SOCKET_TIMEOUT_MS,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
where MY_SOCKET_TIMEOUT_MS is amount of time (in milliseconds) you want to wait before a timeout. Start with 5000 (5 seconds) and play around with it.
Do this before
requestQueue.add(jsonObjectRequest);

How to send to websites on click listview in android?

I am getting list of data from json in which a parameter named as click_url is also there I fetch data in ListView .what I want when on click ListView I want to go to website that click_url contain .how can I do that.
jsons response:-
{
"offers": [{
"offer_id": 97245,
"name": "Earn Talktime & Data Android App",
"description": "Download and install",
"requirements": null,
"credit_delay": "0",
"featured_global": 0,
"epc": "0.00",
"conversion_rate": "0.016",
"testing_status": 0,
"testing_time": "0000-00-00 00:00:00",
"creative_id": 164789,
"creative_filename": "97245-164789.gif",
"creative_url": "https:\/\/asmclk.com\/creat\/97245-164789.gif",
"payout": 0.14,
"payout_custom": 0,
"stats_pending_ce": 0,
"currency_count": 70,
"target_system": 40,
"featured_profile": 0,
"click_url": "https:\/\/asmclk.com\/click.php?aff=105639&camp=97245&from=6453&prod=4&sub1=9555517491&prod_channel=1&device=fb772712-deff-4cc6-9365-41451ed33976&xt=Cb0xo807sNVx8ARZai%2B9dbKYSSBS2XZ23KjB3UGchmL3f8zjm8TT4okSW1ypbTqJ%3A6Jncp2Gx4KZjhM3JqeDoKQ%3D%3D",
"image_url": "\/\/adscendmedia.com\/creat\/97245-164789.gif",
"category_id": [17, 18],
"matches_target_system_detected": true,
"mobile_app": {
"store_id": "info.earntalktime",
"platform": 1
}
}, {
"offer_id": 107027,
"name": "Speak Up - Share Your Thoughts",
"description": "Take part in a survey and get rewarded",
"requirements": null,
"credit_delay": "0",
"featured_global": 0,
"epc": "0.00",
"conversion_rate": "0.006",
"testing_status": 0,
"testing_time": "0000-00-00 00:00:00",
"creative_id": 176235,
"creative_filename": "106989-176199.jpg",
"creative_url": "https:\/\/asmclk.com\/creat\/106989-176199.jpg",
"payout": 0.14,
"payout_custom": 0,
"stats_pending_ce": 0,
"currency_count": 70,
"target_system": 0,
"featured_profile": 0,
"click_url": "https:\/\/asmclk.com\/click.php?aff=105639&camp=107027&from=6453&prod=4&sub1=9555517491&prod_channel=1&device=fb772712-deff-4cc6-9365-41451ed33976&xt=udTdOoT4NSeWh53J%2FJaAf8UGzlJtpd9ZqLvy3TrPf53fPSmCqhaQpWu35HmDYP4V%3Apgx2an3HDsf7Za5dwjSA2A%3D%3D",
"image_url": "\/\/adscendmedia.com\/creat\/106989-176199.jpg",
"category_id": [20],
"matches_target_system_detected": true
}, {
"offer_id": 136497,
"name": "Pockets By ICICI Bank Android App",
"description": "Install and Launch",
"requirements": null,
"credit_delay": "0",
"featured_global": 0,
"epc": "0.00",
"conversion_rate": "0.021",
"testing_status": 0,
"testing_time": "0000-00-00 00:00:00",
"creative_id": 207101,
"creative_filename": "136497-207101.png",
"creative_url": "https:\/\/asmclk.com\/creat\/136497-207101.png",
"payout": 0.14,
"payout_custom": 0,
"stats_pending_ce": 0,
"currency_count": 70,
"target_system": 40,
"featured_profile": 0,
"click_url": "https:\/\/asmclk.com\/click.php?aff=105639&camp=136497&from=6453&prod=4&sub1=9555517491&prod_channel=1&device=fb772712-deff-4cc6-9365-41451ed33976&xt=TFkQXE6w185fT4sagQsrrkcdTd5LJrFe9K2pGZgJ3reXPR0MSVpvsMrjbcd9oShQ%3AaFy%2BGFW2OkHdvEvYmcIfsw%3D%3D",
"image_url": "\/\/adscendmedia.com\/creat\/136497-207101.png",
"category_id": [17, 18],
"matches_target_system_detected": true,
"mobile_app": {
"store_id": "com.icicibank.pockets",
"platform": 1
}
}]
}
listView Code:-
public void getAdscendDeal() {
String url = "http://ads.com/adwall/api/publisher/" + pubId + "/profile/" + aswallId + "/offers.json?subid1=" + m_szMobileNumber;
JSONObject jsonObject = new JSONObject();
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, jsonObject, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.e(TAG, "Server Response::" + response);
try {
JSONArray post = response.optJSONArray("offers");
for (int i = 0; i < post.length(); i++) {
JSONObject obj = post.getJSONObject(i);
m_Item = new CAdscenMediaDealStorage();
m_Item.setM_szHeaderText(obj.getString("name"));
m_Item.setM_szsubHeaderText(obj.getString("description"));
m_Item.setM_szDealValue(obj.getString("currency_count"));
m_Item.setM_szImageView(obj.getString("creative_url"));
m_Item.setM_Link(obj.getString("click_url"));
s_oDataset.add(m_Item);
}
if (!s_oDataset.isEmpty()) {
m_oAdapter = new CADscendDealAdapter(getActivity(), s_oDataset);// create adapter object and add arraylist to adapter
m_ListView.setAdapter(m_oAdapter);//adding adapter to recyclerview
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Server Error::" + error);
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(jsonObjectRequest);
}
ListView Adapter
private class CADscendDealAdapter extends ArrayAdapter {
private final Context m_Context;// declaring context variable
private final ArrayList<CAdscenMediaDealStorage> s_oDataset;// declaring array list ariable
public CADscendDealAdapter(Context m_Context, ArrayList<CAdscenMediaDealStorage> mDataList) {
this.m_Context = m_Context;
s_oDataset = mDataList;
}
#Override
public int getCount() {// get total arraylist size
return s_oDataset.size();
}
#Override
public Object getItem(int position) {// get item position in array list
return s_oDataset.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#SuppressLint("SetTextI18n")
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = View.inflate(m_Context, R.layout.sooper_sonic, null);
viewHolder.m_Header = (TextView) convertView.findViewById(R.id.headingText);
viewHolder.m_Subheader = (TextView) convertView.findViewById(R.id.subHeaderText);
viewHolder.m_logoImage = (ImageView) convertView.findViewById(R.id.appImage);
viewHolder.m_getBtn = (Button) convertView.findViewById(R.id.getDealBtn);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.m_getBtn.setOnClickListener(new View.OnClickListener() {// onclick getDeal Btn
#Override
public void onClick(View v) {//send to deal detail page onclick getDeal Btn
Intent i = new Intent(v.getContext(), CDealAppListingDetails.class);
i.putExtra("DealCode", s_oDataset.get(position).getM_szsubHeaderText());// get deal code from deal data storage
i.putExtra("headerText", s_oDataset.get(position).getM_szHeaderText());// get deal name from deal dta storage
v.getContext().startActivity(i);
}
});
CAdscenMediaDealStorage m = s_oDataset.get(position);
viewHolder.m_Header.setText(m.getM_szHeaderText());
viewHolder.m_Subheader.setText(m.getM_szsubHeaderText());
viewHolder.m_getBtn.setText("GET " + m.getM_szDealValue() + " POINTS");// set deal button text
Picasso.with(m_Context).load(m.getM_szImageView()).placeholder(R.drawable.placeholder).into(viewHolder.m_logoImage);
Picasso.with(m_Context).load(m.getM_szImageView()).into(new Target() {
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
width = width * 2;
height = height * 2;
bitmap = Bitmap.createScaledBitmap(bitmap, width, height, true);
viewHolder.m_logoImage.setImageBitmap(bitmap);
viewHolder.m_logoImage.requestLayout();
}
#Override
public void onBitmapFailed(Drawable errorDrawable) {
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
// set deal logo
return convertView;
}
private class ViewHolder {
public TextView m_Header, m_Subheader, m_DummyText;
public ImageView m_logoImage;
public Button m_getBtn;
}
}

Set an OnItemClickListener on the ListView. The link will open in a browser if it is installed.
Try this code in your Activity,
m_ListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
try {
String url = s_oDataset.get(position).getM_Link();
if (!url.startsWith("http://") && !url.startsWith("https://"))
url = "http://" + url;
Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(myIntent);
} catch (ActivityNotFoundException e) {
Toast.makeText(About.this, "No application can handle this request."
+ " Please install a webbrowser", Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
});

How to show other JsonArray in RecyclerView on Android

I want develop android application for one website. I read website posts from json and show its in RecyclerView every 10 posts and when user scrolling on RecyclerView show more 10 post and go to end! in this project i use okHTTP v3 and RecyclerView!
I want show title from categories in textview, but i don't know how to show this?!
My Json :
{
"status": "ok",
"count": 10,
"count_total": 28,
"pages": 3,
"posts": [{
"id": 145,
"type": "post",
"slug": "english-post-2",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=145",
"status": "publish",
"title": "English Post",
"title_plain": "English Post",
"content": "<p>This post is test for show Text and Image<\/p>\n<p><img class=\"alignnone size-medium wp-image-79\" src=\"http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol49-027-300x240.jpg\" alt=\"[WallpapersMania]_vol49-027\" width=\"300\" height=\"240\" srcset=\"http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol49-027-300x240.jpg 300w, http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol49-027-768x614.jpg 768w, http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol49-027-1024x819.jpg 1024w, http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol49-027.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>This is image in Text<\/p>\n",
"excerpt": "<p>This post is test for show Text and Image<\/p>\n<p>This is image in Text<\/p>\n",
"date": "2016-05-01 08:20:39",
"modified": "2016-05-01 08:20:39",
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 24
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "\u0645\u062d\u0645\u062f",
"first_name": "",
"last_name": "",
"nickname": "\u0645\u062d\u0645\u062f",
"url": "http:\/\/codesaz.com",
"description": "\u0627\u06cc\u0646 \u0632\u0646\u062f\u06af\u06cc \u0646\u0627\u0645\u0647 \u0645\u0646 \u0627\u0633\u062a",
"avatar": "76"
},
"comments": [],
"attachments": [{
"id": 146,
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031.jpg",
"slug": "wallpapersmania_vol33-031",
"title": "WallpapersMania_vol33-031",
"description": "",
"caption": "",
"parent": 145,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-300x225.jpg",
"width": 300,
"height": 225
},
"mediaphase-frontpage-news": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-300x220.jpg",
"width": 300,
"height": 220
},
"mediaphase-blog-large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-700x313.jpg",
"width": 700,
"height": 313
}
}
}],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031.jpg",
"width": 1600,
"height": 1200
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-300x225.jpg",
"width": 300,
"height": 225
},
"mediaphase-frontpage-news": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-300x220.jpg",
"width": 300,
"height": 220
},
"mediaphase-blog-large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/05\/WallpapersMania_vol33-031-700x313.jpg",
"width": 700,
"height": 313
}
}
}
I read this title from this Array :
"categories": [{
"id": 1,
"slug": "%d8%af%d8%b3%d8%aa%d9%87%e2%80%8c%d8%a8%d9%86%d8%af%db%8c-%d9%86%d8%b4%d8%af%d9%87",
"title": "\u062f\u0633\u062a\u0647\u200c\u0628\u0646\u062f\u06cc \u0646\u0634\u062f\u0647",
"description": "",
"parent": 0,
"post_count": 24
}],
My AsyncTask codes:
public class MainDataInfo {
private Context mContext;
private String ServerAddress = ServerIP.getIP();
public void getMainDataInfo(Context context) {
mContext = context;
new getInfo().execute(ServerAddress + "page=1");
}
private class getInfo extends AsyncTask<String, Void, String> {
EventBus bus = EventBus.getDefault();
private String ou_response;
private List<MainDataModel> infoModels;
#Override
protected void onPreExecute() {
CustomProcessDialog.createAndShow(mContext);
infoModels = new ArrayList<>();
}
#Override
protected String doInBackground(String... params) {
OkHttpClient client = new OkHttpClient();
//String url = (String) params[0];
Request request = new Request.Builder()
.url(ServerAddress + "page=1")
.cacheControl(CacheControl.FORCE_NETWORK)
.build();
Response response;
try {
response = client.newCall(request).execute();
ou_response = response.body().string();
response.body().close();
if (ou_response != null) {
try {
JSONObject postObj = new JSONObject(ou_response);
JSONArray postsArray = postObj.optJSONArray("posts");
infoModels = new ArrayList<>();
for (int i = 0; i <= infoModels.size(); i++) {
JSONObject postObject = (JSONObject) postsArray.get(i);
// Thumbnail
JSONObject images = postObject.optJSONObject("thumbnail_images");
JSONObject imagesPair = images.optJSONObject("medium");
// Author
JSONObject Author = postObject.optJSONObject("author");
int id = postObject.getInt("id");
String title = postObject.getString("title");
String content = postObject.getString("content");
String dateTime = postObject.getString("date");
String thumbnail = imagesPair.getString("url");
String authorShow = Author.getString("name");
Log.d("Data", "Post id: " + id);
Log.d("Data", "Post title: " + title);
Log.d("Data", "Post image: " + thumbnail);
Log.d("Data", "Post category: " + authorShow);
//Use the title and id as per your requirement
infoModels.add(new MainDataModel(id, title, content, dateTime, authorShow, thumbnail));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (IOException e) {
e.printStackTrace();
}
return ou_response;
}
#Override
protected void onPostExecute(String result) {
CustomProcessDialog.dissmis();
if (result != null) {
bus.post(infoModels);
}
}
}
}
MainActivity code:
public class Main_page extends AppCompatActivity {
private static final long RIPPLE_DURATION = 250;
private Toolbar toolbar;
private RelativeLayout root;
private ImageView menu_image, toolbar_refresh;
private RecyclerView main_recyclerView;
private MainAdapter_loadMore mAdaper;
private List<MainDataModel> dataModels = new ArrayList<MainDataModel>();
protected Handler handler;
private RelativeLayout loadLayout;
private LinearLayoutManager mLayoutManager;
private int pageCount = 1;
String ServerAddress = ServerIP.getIP();
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page);
if (!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}
// Initializing
handler = new Handler();
context = getApplicationContext();
toolbar = (Toolbar) findViewById(R.id.main_toolbar);
mLayoutManager = new LinearLayoutManager(this);
loadLayout = (RelativeLayout) findViewById(R.id.main_empty_layout);
toolbar_refresh = (ImageView) toolbar.findViewById(R.id.toolbar_update);
// Toolbar
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(null);
}
// Load First Data
LoadData();
// Menu
root = (RelativeLayout) findViewById(R.id.main_root);
View guillotineMenu = LayoutInflater.from(this).inflate(R.layout.menu_layout, null);
root.addView(guillotineMenu);
menu_image = (ImageView) toolbar.findViewById(R.id.toolbar_logo);
new GuillotineAnimation.GuillotineBuilder(guillotineMenu, guillotineMenu.findViewById(R.id.menu_layout_image), menu_image)
.setStartDelay(RIPPLE_DURATION)
.setActionBarViewForAnimation(toolbar)
.setClosedOnStart(true)
.build();
// RecyclerView and setData
main_recyclerView = (RecyclerView) findViewById(R.id.main_recycler);
main_recyclerView.setHasFixedSize(true);
main_recyclerView.setLayoutManager(mLayoutManager);
mAdaper = new MainAdapter_loadMore(this, main_recyclerView, dataModels);
main_recyclerView.setAdapter(mAdaper);
// Load More data
mAdaper.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
dataModels.add(null);
mAdaper.notifyItemInserted(dataModels.size() - 1);
LoadMoreData(pageCount);
}
});
// Refresh Data
toolbar_refresh.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(), PostShow_page.class));
}
});
}
#Subscribe
public void onEvent(List<MainDataModel> mainInfoModels) {
if (dataModels.size() > 0) {
dataModels.remove(dataModels.size() - 1);
mAdaper.notifyItemRemoved(dataModels.size());
mAdaper.setLoaded();
}
mAdaper.add(mainInfoModels);
mAdaper.notifyDataSetChanged();
pageCount++;
if (dataModels.isEmpty()) {
main_recyclerView.setVisibility(View.GONE);
loadLayout.setVisibility(View.VISIBLE);
} else {
main_recyclerView.setVisibility(View.VISIBLE);
loadLayout.setVisibility(View.GONE);
}
}
private void LoadData() {
MainDataInfo dataInfo = new MainDataInfo();
// here getMainDataInfo() should return the server response
dataInfo.getMainDataInfo(this);
}
private void LoadMoreData(int pageNumber) {
MainDataInfo_loadMore dataInfo_loadMore = new MainDataInfo_loadMore();
// here getMainDataInfo() should return the server response
dataInfo_loadMore.getMainDataInfo_loadMore(this, pageNumber);
}
}
Attention : Please don't give me negative points, i am amateur and i really need you helps! thanks all <3

add RecyclerView in layout
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
add dependencies
compile 'com.android.support:recyclerview-v7:23.1.1'
create a layout for each row of RecyclerView and name it list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:clickable="true"
android:background="?android:attr/selectableItemBackground"
android:orientation="vertical">
<TextView
android:id="#+id/title"
android:textColor="#color/title"
android:textSize="16dp"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
create a JAVA file Model.java
public class Model {
public String title;
}
now create java file named as Adapter.java
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class Adapter extends RecyclerView.Adapter<MoviesAdapter.MyViewHolder> {
private ArrayList<Model> modelArrayList=new ArrayList<>();
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title);
}
}
public Adapter(ArrayList<Model> modelArrayList) {
this.modelArrayList = modelArrayList;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_row, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Movie movie = moviesList.get(position);
holder.title.setText(modelArrayList.get(position).title);
}
#Override
public int getItemCount() {
return modelArrayList.size();
}
}
in MainActivity.java
create a Arrylist of type Model
ArrayList<Model> modelArrayList=new ArrayList<>();
RecyclerView recyclerView;
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
prase data
JSONObject jsonObject = new JSONObject(ou_response);
JSONArray message = jsonObject.getJSONArray("categories");
for (int i = 0; i < message.length(); i++) {
Model model = new Model();
JSONObject temp = message.getJSONObject(i);
model.tittle = temp.getString("tittle");
modelArrayList.add(model);
}
create Adapter and set it to recyclerView
Adapter madapter = new Adapter(modelArrayList);
recyclerView.setAdapter(mAdapter);

creating RecyclerView in your xml file:
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
Declare the RecyclerView and JsonArray in your Activity class :
VolleyClass volleyClass;
JSONArray jsonArray = new JSONArray();
RecyclerAdapter recyclerAdapter;
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_head_two_head);
volleyClass = VolleyClass.getInstance(this);
//volleyClass=new VolleyClass(this);
recyclerAdapter = new RecyclerAdapter();
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(HeadToHeadRandom.this, LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(recyclerAdapter);
Retrieve Json data :
JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.POST, URL.HEADTOHEAD_LIST.getURL(), urlObject, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Log.e("onResponse", response.toString());
try {
jsonArray = response.getJSONArray("Categories");
if (jsonArray != null) {
recyclerAdapter.notifyDataSetChanged();
}
} catch (JSONException e) {
e.printStackTrace();
}
mDialog.dismiss();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
mDialog.dismiss();
}
}) {
#Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", "application/json; charset=utf-8");
headers.put("User-agent", System.getProperty("http.agent"));
return headers;
}
#Override
public Priority getPriority() {
return Priority.IMMEDIATE;
}
};
volleyClass.addToRequestQueue(jsObjRequest);
Adapter Class like this:
class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.HaderView> {
#Override
public HaderView onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_head_to_head, parent, false);
lastItem = recyclerView.getChildAdapterPosition(view);
return new HaderView(view);
}
#Override
public void onBindViewHolder(HaderView holder, int position) {
try {
holder.tv_category.setText(jsonArray.getJSONObject(position).getString("title"));
String image_path = jsonArray.getJSONObject(position).getString("icon");
if (image_path != null) {
imageLoader.displayImage(image_path, holder.img_head_to_head, options);
}
} catch (JSONException e) {
e.printStackTrace();
}
final int posi = position;
holder.tv_category.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
try {
String category_id = jsonArray.getJSONObject(posi).getString("id");
startActivity(new Intent(HeadToHead.this, HTHActivity.class).putExtra("category_id", category_id).putExtra("friend_userId", friend_Id));
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
#Override
public int getItemCount() {
return jsonArray.length();
}
class HaderView extends RecyclerView.ViewHolder {
TextView tv_category;
ImageView img_head_to_head;
HaderView(View v) {
super(v);
tv_category = (TextView) v.findViewById(R.id.tv_category);
img_head_to_head = (ImageView) v.findViewById(R.id.img_head_to_head);
}
}
}

arraylist is empty after adding values

When I execute the program, it shows a blank screen and in logcat it shows no adapter attached; skipping layout. When I debug the code the ArrayList is not getting the value (returning 0).
public class MainActivity extends AppCompatActivity implements Constants, NetworkOperation, URL {
LinearLayoutManager manager;
ArrayList<OfferModal> bestoffers;
RecyclerViewAdapter adapter;
RecyclerView rv;
FetchData fetchData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv = (RecyclerView) findViewById(R.id.recyclerview1);
fetchData = new FetchData(this, this, CLOUD_SECTION);
fetchData.fromServer();
manager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
rv.setLayoutManager(new LinearLayoutManager(this));
}
#Override
public void started() {
}
#Override
public void doingBackground() {
}
#Override
public void completed(JSONObject jsonObject) {
bestoffers = new ArrayList<OfferModal>();
try {
JSONArray array_item = new JSONArray();
for (int i = 0; i < array_item.length(); i++) {
JSONObject itemobj = array_item.getJSONObject(i);
String id = itemobj.getString(ID);
String le_id = itemobj.getString(LE_ID);
String title = itemobj.getString(TITLE);
String description = itemobj.getString(DESCRIPTION);
String wid = itemobj.getString(WID);
String hgt = itemobj.getString(HGT);
String tn_path = itemobj.getString(TN_PATH);
String create_time = itemobj.getString(CREATE_TIME);
String update_time = itemobj.getString(UPDATE_TIME);
String view_count = itemobj.getString(VIEW_COUNT);
String slide_count = itemobj.getString(SLIDE_COUNT);
String shared = itemobj.getString(SHARED);
String publish_ver = itemobj.getString(PUBLISH_VER);
String publish_time = itemobj.getString(PUBLISH_TIME);
String user_name = itemobj.getString(USER_NAME);
String avatar_path = itemobj.getString(AVATAR_PATH);
String comment_count = itemobj.getString(COMMENT_COUNT);
String fav = itemobj.getString(FAV);
String fav_count = itemobj.getString(FAV_COUNT);
OfferModal off = new OfferModal(id, le_id, title, description, wid, hgt, tn_path, create_time, update_time, view_count, slide_count, shared, publish_ver, publish_time, user_name, avatar_path, comment_count, fav, fav_count);
off.setId(id);
off.setId(le_id);
off.setTitle(title);
off.setDescription(description);
off.setHgt(hgt);
off.setTn_path(tn_path);
off.setCreate_time(create_time);
off.setUpdate_time(update_time);
off.setView_count(view_count);
off.setSlide_count(slide_count);
off.setShared(shared);
off.setPublish_ver(publish_ver);
off.setPublish_time(publish_time);
off.setUser_name(user_name);
off.setAvatar_path(avatar_path);
off.setComment_count(comment_count);
off.setFav(fav);
off.setFav_count(fav_count);
bestoffers.add(off);
}
} catch (JSONException e) {
e.printStackTrace();
}
adapter = new RecyclerViewAdapter(getApplicationContext(), bestoffers);
rv.setAdapter(adapter);
}
}
This is my json data:
[
{
"id": "42057",
"le_id": "568fb0d29a5eb",
"title": "Bag the Big Deal Lulu Hypermarket",
"description": "",
"wid": "0",
"hgt": "0",
"tn_path": "",
"create_time": "1452257490",
"update_time": "1452332748",
"view_count": "00000000669",
"slide_count": "9",
"shared": "F",
"publish_ver": "11",
"publish_time": "1452332761",
"user_name": " Lulu Retail",
"avatar_path": null,
"comment_count": "0",
"fav": "F",
"fav_count": 0
},
{
"id": "42019",
"le_id": "568f9e45625da",
"title": "Bag the Big Deal Lulu Fashion Store",
"description": "",
"wid": "0",
"hgt": "0",
"tn_path": "",
"create_time": "1452252741",
"update_time": "1452584969",
"view_count": "00000000659",
"slide_count": "1",
"shared": "F",
"publish_ver": "5",
"publish_time": "1452584972",
"user_name": " Lulu Retail",
"avatar_path": null,
"comment_count": "0",
"fav": "F",
"fav_count": 0
},
{
"id": "42017",
"le_id": "568f9e30df0da",
"title": "Bag the Big Deal Lulu Connect",
"description": "",
"wid": "0",
"hgt": "0",
"tn_path": "",
"create_time": "1452252720",
"update_time": "1452585162",
"view_count": "00000000726",
"slide_count": "7",
"shared": "F",
"publish_ver": "7",
"publish_time": "1452275301",
"user_name": " Lulu Retail",
"avatar_path": null,
"comment_count": "0",
"fav": "F",
"fav_count": 0
}
]
This is my adapter class:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
ArrayList<OfferModal> mBestoffers;
Context context;
// List<Offers>card_items;
RequestQueue mRequestQueue;
ImageLoader mImageLoader;
public RecyclerViewAdapter(Context context, ArrayList<OfferModal> mBestoffers) {
this.context = context;
// this.card_items = card_items;
this.mBestoffers = mBestoffers;
mRequestQueue = Volley.newRequestQueue(context);
mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(10);
public void putBitmap(String url, Bitmap bitmap) {
mCache.put(url, bitmap);
}
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
});
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardlayout, null);
RecyclerViewHolder rvh = new RecyclerViewHolder(view);
return rvh;
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
// holder.imageView.setImageUrl(mBestoffers.get(position).getAvatar_path(), mImageLoader);
holder.tv1.setText(mBestoffers.get(position).getTitle());
//write code to download image and data from server and set here
}
#Override
public int getItemCount() {
return mBestoffers.size();
}
}
Please help me to solve this issue, any help will be greately appriciated.

Please paste jsonObject.toString() in completed().
Array empty reason is here.
JSONArray array_item = new JSONArray();
for (int i = 0; i < array_item.length(); i++) {

Please use this code it will help you.
public class MainActivity extends AppCompatActivity implements Constants, NetworkOperation, URL {
LinearLayoutManager manager;
ArrayList<OfferModal> bestoffers;
RecyclerViewAdapter adapter;
RecyclerView rv;
FetchData fetchData;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv = (RecyclerView) findViewById(R.id.recyclerview1);
fetchData = new FetchData(this, this, CLOUD_SECTION);
fetchData.fromServer();
manager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false);
rv.setLayoutManager(new LinearLayoutManager(this));
}
#Override
public void started() {
}
#Override
public void doingBackground() {
}
#Override
public void completed(JSONObject jsonObject) {
bestoffers = new ArrayList<OfferModal>();
try {
JSONArray array_item = new JSONArray();
for (int i = 0; i < array_item.length(); i++) {
JSONObject itemobj = array_item.getJSONObject(i);
String id = itemobj.getString(ID);
String le_id = itemobj.getString(LE_ID);
String title = itemobj.getString(TITLE);
String description = itemobj.getString(DESCRIPTION);
String wid = itemobj.getString(WID);
String hgt = itemobj.getString(HGT);
String tn_path = itemobj.getString(TN_PATH);
String create_time = itemobj.getString(CREATE_TIME);
String update_time = itemobj.getString(UPDATE_TIME);
String view_count = itemobj.getString(VIEW_COUNT);
String slide_count = itemobj.getString(SLIDE_COUNT);
String shared = itemobj.getString(SHARED);
String publish_ver = itemobj.getString(PUBLISH_VER);
String publish_time = itemobj.getString(PUBLISH_TIME);
String user_name = itemobj.getString(USER_NAME);
String avatar_path = itemobj.getString(AVATAR_PATH);
String comment_count = itemobj.getString(COMMENT_COUNT);
String fav = itemobj.getString(FAV);
String fav_count = itemobj.getString(FAV_COUNT);
OfferModal off = new OfferModal(id, le_id, title, description, wid, hgt, tn_path, create_time, update_time, view_count, slide_count, shared, publish_ver, publish_time, user_name, avatar_path, comment_count, fav, fav_count);
off.setId(id);
off.setId(le_id);
off.setTitle(title);
off.setDescription(description);
off.setHgt(hgt);
off.setTn_path(tn_path);
off.setCreate_time(create_time);
off.setUpdate_time(update_time);
off.setView_count(view_count);
off.setSlide_count(slide_count);
off.setShared(shared);
off.setPublish_ver(publish_ver);
off.setPublish_time(publish_time);
off.setUser_name(user_name);
off.setAvatar_path(avatar_path);
off.setComment_count(comment_count);
off.setFav(fav);
off.setFav_count(fav_count);
bestoffers.add(off);
}
} catch (JSONException e) {
e.printStackTrace();
}
adapter = new RecyclerViewAdapter(MainActivity.this,R.layout.cardlayout, bestoffers);
rv.setAdapter(adapter);
adapter.notifyDataSetChanged()
}
}

Your main problem lies in the JSONArray, you are initialising to a new JSONArray, which is empty, please check what is the size of the array in the jsonArray.length(); I'm sure it is 0. That is why your arraylist is also empty.