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Fragment, Volley and RecyclerView

I hope someone out there can help me solve my problem. I have android app that have 3 tabs, i use fragment, first tab is recyclerView list, second tabs is map. the problem is in tabs 1, i need to fetch data with volley to recyclerView on tabs 1, if run fine but i cannot see the data on first app start, but when i change tab and back to tab 1 again it will refresh the data and show the data on recyclerView.
Adapter.java
public class CustomListAdapterWarkop extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private List<Warkop> mWarkop;
private LayoutInflater inflater;
public CustomListAdapterWarkop(Context context, List<Warkop> mWarkop) {
this.context=context;
inflater= LayoutInflater.from(context);
this.mWarkop = mWarkop;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.list_warkop_row, parent, false);
ItemViewHolder holder = new ItemViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
ItemViewHolder viewHolder = (ItemViewHolder) holder;
Warkop current = mWarkop.get(position);
viewHolder.tvNamaWarkop.setText(current.getNamaWarkop());
ImageLoader imageLoader = ImageLoader.getInstance();
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisc(true).resetViewBeforeLoading(true)
.showImageForEmptyUri(R.drawable.noimage)
.showImageOnFail(R.drawable.noimage)
.showImageOnLoading(R.drawable.noimage).build();
imageLoader.displayImage(current.getFotoWarkop(), viewHolder.ivFotoWarkop, options);
}
#Override
public int getItemCount() {
return mWarkop.size();
}
}
ItemHolder.java
package com.andylah.warkopedia;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
/**
* Created by andylah on 11/3/2017.
*/
public class ItemViewHolder extends RecyclerView.ViewHolder {
public ImageView ivFotoWarkop;
public TextView tvNamaWarkop;
public ItemViewHolder(View itemView) {
super(itemView);
tvNamaWarkop = itemView.findViewById(R.id.nama_warkop);
ivFotoWarkop = itemView.findViewById(R.id.image_warkop);
}
}
Tab 1.java
public class tabSatu extends Fragment {
private static final String TAG = tabDua.class.getSimpleName();
public static final int CONNECTION_TIMEOUT = 10000;
public static final int READ_TIMEOUT = 15000;
private boolean isFragmentLoaded = false;
View vTabSatu;
private RecyclerView recyclerView;
public static List<Warkop> warkopList = new ArrayList<Warkop>();
private CustomListAdapterWarkop warkopAdapter;
public tabSatu(){
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
new AsyncFetch().execute();
vTabSatu = inflater.inflate(R.layout.tabsatu_view, container, false);
recyclerView = vTabSatu.findViewById(R.id.warkop_container);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
Log.d("LOG : ", "onCreatedView Run");
// Inflate the layout for this fragment
return vTabSatu;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
warkopAdapter = new CustomListAdapterWarkop(getActivity(), warkopList);
warkopAdapter.notifyDataSetChanged();
recyclerView.setAdapter(warkopAdapter);
Log.d("LOG : ", "onViewCreated Run");
}
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser && !isFragmentLoaded ) {
// Load your data here or do network operations here
isFragmentLoaded = true;
//new AsyncFetch().execute();
}else{
isFragmentLoaded = false;
Log.d("LOG : ", "isFragmentLoaded = false");
}
}
private class AsyncFetch extends AsyncTask<String, String, String> {
ProgressDialog pDialog = new ProgressDialog(getActivity());
HttpURLConnection conn;
URL url = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog.setMessage("Loading list warkop ...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected String doInBackground(String... strings) {
try {
// Enter URL address where your json file resides
// Even you can make call to php file which returns json data
url = new URL(AppConfig.LOAD_WARKOP);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoOutput to true as we recieve data from json file
conn.setDoOutput(true);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return ("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
#Override
protected void onPostExecute(String result) {
pDialog.dismiss();
try{
JSONObject object = new JSONObject(result);
String getObject = object.getString("warkop");
JSONArray jsonArray = new JSONArray(getObject);
boolean error = object.getBoolean("error");
if(!error){
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Warkop warkop = new Warkop();
warkop.setNamaWarkop(jsonObject.getString("nama_warkop"));
warkop.setAlamatWrkop(jsonObject.getString("alamat_warkop"));
warkop.setKotaWarkop(jsonObject.getString("kota_warkop"));
warkop.setLatWarkop(Double.parseDouble(jsonObject.getString("lat_warkop")));
warkop.setLangWarkop(Double.parseDouble(jsonObject.getString("long_warkop")));
warkop.setIsWifi(Integer.parseInt(jsonObject.getString("is_wifi")));
warkop.setIsToilet(Integer.parseInt(jsonObject.getString("is_toilet")));
warkop.setIsTv(Integer.parseInt(jsonObject.getString("is_tv")));
warkop.setIsColokan(Integer.parseInt(jsonObject.getString("is_colokan")));
warkop.setIsParkir(Integer.parseInt(jsonObject.getString("is_parkir")));
warkop.setFotoWarkop(jsonObject.getString("foto_warkop"));
warkopList.add(warkop);
}
}else{
String errorMsg = object.getString("error_msg");
Toast.makeText(getContext(),
errorMsg, Toast.LENGTH_LONG).show();
}
}catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getActivity(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
}

Problem: Even you call notifyDataSetChanged() but there are no data in Adapter.
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
warkopAdapter = new CustomListAdapterWarkop(getActivity(), warkopList);
warkopAdapter.notifyDataSetChanged();
recyclerView.setAdapter(warkopAdapter);
}
So you need to set and notify warkopList to Adapter after API call. It will help you.
tabSatu:
#Override
protected void onPostExecute(String result) {
pDialog.dismiss();
try {
JSONObject object = new JSONObject(result);
String getObject = object.getString("warkop");
JSONArray jsonArray = new JSONArray(getObject);
boolean error = object.getBoolean("error");
if (!error) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Warkop warkop = new Warkop();
...
warkopList.add(warkop);
adapter.setItems(warkopList);
}
}
...
}
CustomListAdapterWarkop: add setItem() method to Adapter
public class CustomListAdapterWarkop extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
...
public void setItems(List<WarkopList> warkopList) {
mWarkop = warkopList;
notifyDataSetChanged();
}
...
}

How to load more Jsons data in Recyclerview in android

I am using recyclerview in which I want to fetch more data from server using json.
scenario is something like that :- On first hit I want to display 5 page in list and a show more button below recyclerview is there when user click show more button on second hit display 5 more pages.how can I do that
here is my code
public class MainActivity extends AppCompatActivity {
public static String m_DealListingURL = "http://9992.1999.0.110:8080/ireward/rest/json/metallica/getDealListInJSON";
public static String s_szresult = " ";
public Handler m_Handler;
private Toolbar mToolbar;
private RecyclerView mRecyclerView;
private List<User> mUsers = new ArrayList<>();
private UserAdapter mUserAdapter;
//declare boolean
private CJsonsResponse m_oJsonsResponse;
private JSONObject m_oResponseobject;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
mToolbar.setTitle("LoadMoreRecycleView");
new CDealDataSent().execute(m_DealListingURL);
mRecyclerView = (RecyclerView) findViewById(R.id.recycleView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
m_Handler = new Handler();
mUserAdapter = new UserAdapter();// create adapter object and add arraylist to adapter
mUserAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
Log.e("haint", "Load More");
mUsers.add(null);
mUserAdapter.notifyItemInserted(mUsers.size() - 1);
//Load more data for reyclerview
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Log.e("haint", "Load More 2");
//Remove loading item
mUsers.remove(mUsers.size() - 1);
mUserAdapter.notifyItemRemoved(mUsers.size());
//Load data
int index = mUsers.size();
int end = index + 20;
for (int i = index; i < end; i++) {
User user = new User();
user.setName("Name " + i);
user.setEmail("alibaba" + i + "#gmail.com");
mUsers.add(user);
}
mUserAdapter.notifyDataSetChanged();
mUserAdapter.setLoaded();
}
}, 5000);
}
});
}
//sending deal data to retreive response from server
public String DealListing(String url, CRegistrationDataStorage login) {
InputStream inputStream = null;
m_oJsonsResponse = new CJsonsResponse();
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json = "";
// 3. build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.put("agentCode", "7777777776");
jsonObject.put("pin", "38F629170AC3AB74B9D6D2CC411C2F3C");
jsonObject.put("recordcount", "5");
jsonObject.put("lastcountvalue", "0");
//jsonObject.put("emailId", "nirajk1190#gmail.com");
// 4. convert JSONObject to JSON to String
json = jsonObject.toString();
// 5. set json to StringEntity
StringEntity se = new StringEntity(json);
// 6. set httpPost Entity
httpPost.setEntity(se);
// 7. Set some headers to inform server about the type of the content
httpPost.setHeader("Content-type", "application/json");
// 8. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
HttpEntity entity = httpResponse.getEntity();
// 9. receive response as inputStream
inputStream = entity.getContent();
System.out.println("InputStream....:" + inputStream.toString());
System.out.println("Response....:" + httpResponse.toString());
StatusLine statusLine = httpResponse.getStatusLine();
System.out.println("statusLine......:" + statusLine.toString());
////Log.d("resp_body", resp_body.toString());
int statusCode = statusLine.getStatusCode();
// 10. convert inputstream to string
if (statusCode == 200) {
// 10. convert inputstream to string
if (inputStream != null)
s_szresult = m_oJsonsResponse.convertInputStreamToString(inputStream);
//String resp_body =
EntityUtils.toString(httpResponse.getEntity());
} else
s_szresult = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
System.out.println("resul.....:" + s_szresult);
// 11. return s_szResult
return s_szresult;
}
public void getResponse() throws JSONException {// getting response from serevr ..................
if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Transaction Successful")) {// server based condition
mRecyclerView.setAdapter(mUserAdapter);//adding adapter to recyclerview
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {//server based conditions
Toast.makeText(MainActivity.this, "Connection not avaliable", Toast.LENGTH_SHORT).show();
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Deal List Not Found")) {// serevr based conditions .....
Toast.makeText(MainActivity.this, "No more deals", Toast.LENGTH_SHORT).show();
;
}
}
static class UserViewHolder extends RecyclerView.ViewHolder {
public TextView tvName;
public TextView tvEmailId;
public UserViewHolder(View itemView) {
super(itemView);
tvName = (TextView) itemView.findViewById(R.id.tvName);
tvEmailId = (TextView) itemView.findViewById(R.id.tvEmailId);
}
}
static class LoadingViewHolder extends RecyclerView.ViewHolder {
public ProgressBar progressBar;
public LoadingViewHolder(View itemView) {
super(itemView);
progressBar = (ProgressBar) itemView.findViewById(R.id.progressBar1);
}
}
class UserAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final int VIEW_TYPE_ITEM = 0;
private final int VIEW_TYPE_LOADING = 1;
private OnLoadMoreListener mOnLoadMoreListener;
private boolean isLoading;
private int visibleThreshold = 5;
private int lastVisibleItem, totalItemCount;
public UserAdapter() {
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if (!isLoading && totalItemCount <= (lastVisibleItem + visibleThreshold)) {
if (mOnLoadMoreListener != null) {
mOnLoadMoreListener.onLoadMore();
}
isLoading = true;
}
}
});
}
public void setOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener) {
this.mOnLoadMoreListener = mOnLoadMoreListener;
}
#Override
public int getItemViewType(int position) {
return mUsers.get(position) == null ? VIEW_TYPE_LOADING : VIEW_TYPE_ITEM;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == VIEW_TYPE_ITEM) {
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.layout_user_item, parent, false);
return new UserViewHolder(view);
} else if (viewType == VIEW_TYPE_LOADING) {
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.layout_loading_item, parent, false);
return new LoadingViewHolder(view);
}
return null;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof UserViewHolder) {
User user = mUsers.get(position);
UserViewHolder userViewHolder = (UserViewHolder) holder;
userViewHolder.tvName.setText(user.getName());
userViewHolder.tvEmailId.setText(user.getEmail());
} else if (holder instanceof LoadingViewHolder) {
LoadingViewHolder loadingViewHolder = (LoadingViewHolder) holder;
loadingViewHolder.progressBar.setIndeterminate(true);
}
}
#Override
public int getItemCount() {
return mUsers == null ? 0 : mUsers.size();
}
public void setLoaded() {
isLoading = false;
}
}
// sending deal data to server and retreive response......
class CDealDataSent extends AsyncTask<String, Void, String> {
public CRegistrationDataStorage oRegisterStorage;
public User item;
public ProgressDialog pDialog;
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
//pDialog.getWindow().setBackgroundDrawableResource(R.color.trans);
pDialog.setMessage("Processing ...");
//pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected String doInBackground(String... urls) {
return DealListing(urls[0], oRegisterStorage);// sending data to server...
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(final String result) {
new Thread(new Runnable() {
#Override
public void run() {
m_Handler.post(new Runnable() {
#Override
public void run() {
pDialog.dismiss();
try {
m_oResponseobject = new JSONObject(result);// getting response from server
JSONArray posts = m_oResponseobject.optJSONArray("dealList");
mUsers = new ArrayList<User>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);
item = new User();
item.setEmail(post.getString("dealname"));
item.setName(post.getString("dealcode"));
mUsers.add(item);
}
getResponse();
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}
}).start();
}
}
}
From the above code Here I want second hit to server to get more data and add to adapter
mUserAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
Log.e("haint", "Load More");
mUsers.add(null);
mUserAdapter.notifyItemInserted(mUsers.size() - 1);
//Load more data for reyclerview
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Log.e("haint", "Load More 2");
//Remove loading item
mUsers.remove(mUsers.size() - 1);
mUserAdapter.notifyItemRemoved(mUsers.size());
// instead off this I want to hit second time to server to get more data ...here
int index = mUsers.size();
int end = index + 20;
for (int i = index; i < end; i++) {
User user = new User();
user.setName("Name " + i);
user.setEmail("alibaba" + i + "#gmail.com");
mUsers.add(user);
}
mUserAdapter.notifyDataSetChanged();
mUserAdapter.setLoaded();
}
}, 5000);
}
});

How to show more in Recylerview in android [duplicate]

This question already has answers here:
How to implement endless list with RecyclerView?
(36 answers)
Closed 6 years ago.
I am developing an app in which there is recyclerview in which I have to show more at bottom on which user scroll load more data. Please help me out from this problem.
Here is my fragment class where I show Recycler View:
public class CDealAppListing extends Fragment {
public static String m_DealListingURL = "http://192.143.0.110:8080/ireward/rest/json/metallica/getDealListInJSON";
public static String s_szresult = " ";
public static RecyclerView m_RecyclerView;
public static CDealAppListingAdapter m_oAdapter;
public static CDealAppDatastorage item;
public ArrayList<CDealAppDatastorage> s_oDataset;
public int[] m_n_FormImage;
public View m_Main;
public CRegistrationSessionManagement m_oSessionManagement;
public String m_szMobileNumber, m_szEncryptedPassword;
public LinearLayoutManager mLayoutManager;
public RelativeLayout loadProgress;
public AppCompatButton m_showMore;
public ProgressBar mProgressBar;
int r = 4;
int u = 0;
String record = String.valueOf(r);
String last = String.valueOf(u);
//declare boolean
private CJsonsResponse m_oJsonsResponse;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
m_Main = inflater.inflate(R.layout.deal_app_listing, container, false);//intialize mainLayout
new CDealDataSent().execute(m_DealListingURL);
init();//initialize method
implementScroll();
return m_Main;
}
public void init() {
mProgressBar = (ProgressBar) m_Main.findViewById(R.id.progressBar1);
mProgressBar.setVisibility(View.GONE);
m_showMore = (AppCompatButton) m_Main.findViewById(R.id.show_more);
m_showMore.setBackgroundColor(Color.TRANSPARENT);
m_showMore.setVisibility(View.INVISIBLE);
// Getting the string array from strings.xml
m_n_FormImage = new int[]{
R.drawable.amazon,
R.drawable.whatsapp,
R.drawable.zorpia,
R.drawable.path,
R.drawable.app_me,
R.drawable.evernote,
R.drawable.app_me};
m_RecyclerView = (RecyclerView) m_Main.findViewById(R.id.my_recycler_view);//finding id of recyclerview
m_RecyclerView.setItemAnimator(new DefaultItemAnimator());//setting default animation to recyclerview
m_RecyclerView.setHasFixedSize(true);//fixing size of recyclerview
//Layout manager for Recycler view
mLayoutManager = new LinearLayoutManager(getActivity());
m_RecyclerView.setLayoutManager(mLayoutManager);//showing odata vertically to user.
m_oSessionManagement = new CRegistrationSessionManagement(getActivity());
HashMap<String, String> user = m_oSessionManagement.getRegistrationDetails();
m_szEncryptedPassword = user.get(m_oSessionManagement.s_szKEY_PASSWORD);
m_szMobileNumber = user.get(m_oSessionManagement.s_szKEY_MOBILENUMBER);
}
public void implementScroll() {
m_RecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
m_showMore.setVisibility(View.VISIBLE);
m_showMore.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//change boolean value
m_showMore.setVisibility(View.INVISIBLE);
r = r + 4;
u = u + 4;
record = String.valueOf(r);
last = String.valueOf(u);
new DealNext().execute(m_DealListingURL);
}
});
} else {
m_showMore.setVisibility(View.INVISIBLE);
}
}
});
}
//sending deal data to retreive response from server
public String DealListing(String url, CRegistrationDataStorage login) {
InputStream inputStream = null;
m_oJsonsResponse = new CJsonsResponse();
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json = "";
// 3. build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.put("agentCode", "989899999");
jsonObject.put("pin", "05E0901648FD6439207FA74FC3E07734");
jsonObject.put("recordcount", record);
jsonObject.put("lastcountvalue", last);
//jsonObject.put("emailId", "nirajk1190#gmail.com");
// 4. convert JSONObject to JSON to String
json = jsonObject.toString();
// 5. set json to StringEntity
StringEntity se = new StringEntity(json);
// 6. set httpPost Entity
httpPost.setEntity(se);
// 7. Set some headers to inform server about the type of the content
httpPost.setHeader("Content-type", "application/json");
// 8. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
HttpEntity entity = httpResponse.getEntity();
// 9. receive response as inputStream
inputStream = entity.getContent();
System.out.println("InputStream....:" + inputStream.toString());
System.out.println("Response....:" + httpResponse.toString());
StatusLine statusLine = httpResponse.getStatusLine();
System.out.println("statusLine......:" + statusLine.toString());
////Log.d("resp_body", resp_body.toString());
int statusCode = statusLine.getStatusCode();
// 10. convert inputstream to string
if (statusCode == 200) {
// 10. convert inputstream to string
if (inputStream != null)
s_szresult = m_oJsonsResponse.convertInputStreamToString(inputStream);
//String resp_body =
EntityUtils.toString(httpResponse.getEntity());
} else
s_szresult = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
System.out.println("resul.....:" + s_szresult);
// 11. return s_szResult
return s_szresult;
}
// sending deal data to server and retreive response......
class CDealDataSent extends AsyncTask<String, Void, String> {
public JSONObject m_oResponseobject;
public ProgressDialog m_PDialog;
public CRegistrationDataStorage oRegisterStorage;
public CDealAppDatastorage item;
// #Override
protected void onPreExecute() {
super.onPreExecute();
m_PDialog = new ProgressDialog(getActivity());
m_PDialog.setMessage("Please wait while Loading Deals...");
m_PDialog.setCancelable(false);
m_PDialog.show();
}
#Override
protected String doInBackground(String... urls) {
return DealListing(urls[0], oRegisterStorage);// sending data to server...
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(String result) {
m_PDialog.dismiss();
try {
m_oResponseobject = new JSONObject(result);// getting response from server
final JSONArray posts = m_oResponseobject.optJSONArray("dealList");
s_oDataset = new ArrayList<CDealAppDatastorage>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);
item = new CDealAppDatastorage();
item.setM_szHeaderText(post.getString("dealname"));
item.setM_szsubHeaderText(post.getString("dealcode"));
item.setM_n_Image(m_n_FormImage[i]);
s_oDataset.add(item);
}
if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Transaction Successful")) {
m_oAdapter = new CDealAppListingAdapter(s_oDataset);//creating object of adapter and addd setting odata to adapter for use.
m_RecyclerView.setAdapter(m_oAdapter);//adding adapter to recyclerview
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {
Toast.makeText(getActivity(), "Connection not avaliable", Toast.LENGTH_SHORT).show();
}
System.out.println("agentCode...." + m_szMobileNumber);
System.out.println("password...." + m_szEncryptedPassword);
System.out.println("record////" + record);
System.out.println("last:........" + last);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private class DealNext extends AsyncTask<String, Void, String> {
public JSONObject m_oResponseobject;
public CRegistrationDataStorage oRegisterStorage;
#Override
protected void onPreExecute() {
super.onPreExecute();
mProgressBar.setVisibility(View.VISIBLE);
}
#Override
protected String doInBackground(String... urls) {
//My Background tasks are written here
synchronized (this) {
return DealListing(urls[0], oRegisterStorage);
}
}
#Override
protected void onPostExecute(String result) {
mProgressBar.setVisibility(View.INVISIBLE);
super.onPostExecute(result);
try {
m_oResponseobject = new JSONObject(result);// getting response from server
final JSONArray posts = m_oResponseobject.optJSONArray("dealList");
s_oDataset = new ArrayList<CDealAppDatastorage>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);
item = new CDealAppDatastorage();
item.setM_szHeaderText(post.getString("dealname"));
item.setM_szsubHeaderText(post.getString("dealcode"));
item.setM_n_Image(m_n_FormImage[i]);
s_oDataset.add(item);
}
if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Transaction Successful")) {
m_oAdapter = new CDealAppListingAdapter(s_oDataset);//creating object of adapter and addd setting odata to adapter for use.
m_RecyclerView.setAdapter(m_oAdapter);//adding adapter to recyclerview
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {
Toast.makeText(getActivity(), "Connection not avaliable", Toast.LENGTH_SHORT).show();
}
System.out.println("agentCode...." + m_szMobileNumber);
System.out.println("password...." + m_szEncryptedPassword);
System.out.println("record////" + record);
System.out.println("last:........" + last);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
And here is Adapter class:-
public class CDealAppListingAdapter extends RecyclerView.Adapter<CDealAppListingAdapter.DealAppViewHolder> {
private static ArrayList<CDealAppDatastorage> s_oDataset;
public CDealAppListingAdapter(ArrayList<CDealAppDatastorage> mDataList) {
s_oDataset = mDataList;
}
#Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
#Override
public DealAppViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.deallisting_card_view, viewGroup, false);
DealAppViewHolder viewHolder = new DealAppViewHolder(itemLayoutView);//creating object of ViewHolder containg component
return viewHolder;
}
#Override
public void onBindViewHolder(DealAppViewHolder viewHolder, int i) {
CDealAppDatastorage list = s_oDataset.get(i);// receiving item on position on index i
DealAppViewHolder.s_szAppImage.setImageResource(list.getM_n_Image());//adding m_n_Image to viewHolder
DealAppViewHolder.s_szheadingText.setText(list.getM_szHeaderText());
DealAppViewHolder.s_szSubHeader.setText(list.getM_szsubHeaderText());
viewHolder.m_oDealAppDatastorage = list;
}
#Override
public int getItemCount() {
return (null != s_oDataset ? s_oDataset.size() : 0);//counting size of odata in ArrayList
}
public static class DealAppViewHolder extends RecyclerView.ViewHolder {
public static ImageView s_szAppImage;
public static TextView s_szheadingText, s_szSubHeader;
public static Button s_szGetDealBtn;
public CDealAppDatastorage m_oDealAppDatastorage;
public DealAppViewHolder(View itemLayoutView) {
super(itemLayoutView);
s_szheadingText = (TextView) itemLayoutView.findViewById(R.id.headingText);// finding id of headerText...
s_szSubHeader = (TextView) itemLayoutView.findViewById(R.id.subHeaderText);// finding id of subHeader.....
s_szAppImage = (ImageView) itemLayoutView.findViewById(R.id.appImage);//finding Id of Imgae in CardView
s_szGetDealBtn = (Button) itemLayoutView.findViewById(R.id.getDealBtn);// finding id of getdeal Btn
Random rnd = new Random();//creating object of Random class
int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));//genrating random color
s_szGetDealBtn.setBackgroundColor(color);//backgraound color of getDeal Btn
s_szGetDealBtn.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);
Bundle b = new Bundle();
b.putSerializable("DATA", s_oDataset.get(getPosition()));// sending data to deal detail page
i.putExtras(b);
v.getContext().startActivity(i);
}
});
itemLayoutView.setOnClickListener(new View.OnClickListener() {// onclick cardview
#Override
public void onClick(View v) {// onclick cardview send to deal app listing details page .....
Intent i = new Intent(v.getContext(), CDealAppListingDetails.class);
Bundle b = new Bundle();
b.putSerializable("DATA", s_oDataset.get(getPosition()));
i.putExtras(b);
v.getContext().startActivity(i);
}
});
}
}
}

How I've implemented similar thing is, I added a footer in my RecyclerView named 'Load More' and then by clicking on the load more footer i called a service again to fetch more data and then notify the recycler view to repopulate the data.
So let me put a discussion of my server side implementation. When the RecyclerView is loaded for the first time I called a service to fetch the data from server with page number 0. When the response is received I populated the RecyclerView and added a load more footer at the end of RecyclerView. When the load more footer is clicked I called the service again with page number 1 and when I got the response back I appended the data with the previously saved list and then called notifyDataSetChanged on the Adapter. That's how a simple pagination is done in my case.
I had to put a boolean which was returned in every single response from server indicating if I have any more data to show. So that when the boolean hasNext was found false I had to change the text of the load more footer to 'no more results to show', so that user can understand there's no more data.
Here's now you can add a footer in your RecyclerView

How to update UI from separate AsynkTask class

I have a class CDealListing from where I execute AsynkTask class which is separate class,what I want is to update UI of class CDealListing on AsynkTask class onPost method .kindly help me .....
here is code of my class CDealListing
public class CDealAppListing extends Fragment {
public static String m_DealListingURL = "http://192.166.0.110:8080/ireward/rest/json/metallica/getDealListInJSON";
public static String s_szresult = " ";
public static RecyclerView m_RecyclerView;
public static CDealAppListingAdapter m_oAdapter;
public static CDealAppDatastorage item;
public ArrayList<CDealAppDatastorage> s_oDataset;
public int[] m_n_FormImage;
public View m_Main;
public CRegistrationSessionManagement m_oSessionManagement;
public String m_szMobileNumber, m_szEncryptedPassword;
public LinearLayoutManager mLayoutManager;
public AppCompatButton m_showMore;
public ProgressBar mProgressBar;
public int m_n_DefaultRecordCount = 5;// intiallly record count is 5.
public int m_n_DeafalutLastCount = 0;//initally lastcount is 0.
public String sz_RecordCount, sz_LastCount;
//declare boolean
private CJsonsResponse m_oJsonsResponse;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
m_Main = inflater.inflate(R.layout.deal_app_listing, container, false);//intialize mainLayout
new CDealDataSent().execute(m_DealListingURL);
init();//initialize method
implementScroll();
return m_Main;
}
public void init() {
mProgressBar = (ProgressBar) m_Main.findViewById(R.id.progressBar1);
mProgressBar.setVisibility(View.GONE);
m_showMore = (AppCompatButton) m_Main.findViewById(R.id.show_more);
m_showMore.setBackgroundColor(Color.TRANSPARENT);
m_showMore.setVisibility(View.GONE);
// Getting the string array from strings.xml
m_n_FormImage = new int[]{
R.drawable.amazon,
R.drawable.whatsapp,
R.drawable.zorpia,
R.drawable.path,
R.drawable.app_me,
R.drawable.evernote,
R.drawable.app_me};
m_RecyclerView = (RecyclerView) m_Main.findViewById(R.id.my_recycler_view);//finding id of recyclerview
m_RecyclerView.setItemAnimator(new DefaultItemAnimator());//setting default animation to recyclerview
m_RecyclerView.setHasFixedSize(true);//fixing size of recyclerview
mLayoutManager = new LinearLayoutManager(getActivity());
m_RecyclerView.setLayoutManager(mLayoutManager);//showing odata vertically to user.
m_oSessionManagement = new CRegistrationSessionManagement(getActivity());
HashMap<String, String> user = m_oSessionManagement.getRegistrationDetails();
m_szEncryptedPassword = user.get(m_oSessionManagement.s_szKEY_PASSWORD);
m_szMobileNumber = user.get(m_oSessionManagement.s_szKEY_MOBILENUMBER);
sz_RecordCount = String.valueOf(m_n_DefaultRecordCount);// increment of record count
sz_LastCount = String.valueOf(m_n_DeafalutLastCount);
}
public void implementScroll() {
m_RecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE){
}
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) {
m_showMore.setVisibility(View.VISIBLE);
m_showMore.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//change boolean value
m_showMore.setVisibility(View.GONE);
m_n_DefaultRecordCount = m_n_DefaultRecordCount + 5;
m_n_DeafalutLastCount = m_n_DeafalutLastCount + 5;
sz_RecordCount = String.valueOf(m_n_DefaultRecordCount);
sz_LastCount = String.valueOf(m_n_DeafalutLastCount);
new DealNext().execute(m_DealListingURL);
}
});
} else {
m_showMore.setVisibility(View.GONE);
}
}
});
}
//sending deal data to retreive response from server
public String DealListing(String url, CRegistrationDataStorage login) {
InputStream inputStream = null;
m_oJsonsResponse = new CJsonsResponse();
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json = "";
// 3. build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.put("agentCode", m_szMobileNumber);
jsonObject.put("pin", m_szEncryptedPassword);
jsonObject.put("recordcount", sz_RecordCount);
jsonObject.put("lastcountvalue", sz_LastCount);
//jsonObject.put("emailId", "nirajk1190#gmail.com");
// 4. convert JSONObject to JSON to String
json = jsonObject.toString();
// 5. set json to StringEntity
StringEntity se = new StringEntity(json);
// 6. set httpPost Entity
httpPost.setEntity(se);
// 7. Set some headers to inform server about the type of the content
httpPost.setHeader("Content-type", "application/json");
// 8. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
HttpEntity entity = httpResponse.getEntity();
// 9. receive response as inputStream
inputStream = entity.getContent();
System.out.println("InputStream....:" + inputStream.toString());
System.out.println("Response....:" + httpResponse.toString());
StatusLine statusLine = httpResponse.getStatusLine();
System.out.println("statusLine......:" + statusLine.toString());
////Log.d("resp_body", resp_body.toString());
int statusCode = statusLine.getStatusCode();
// 10. convert inputstream to string
if (statusCode == 200) {
// 10. convert inputstream to string
if (inputStream != null)
s_szresult = m_oJsonsResponse.convertInputStreamToString(inputStream);
//String resp_body =
EntityUtils.toString(httpResponse.getEntity());
} else
s_szresult = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
System.out.println("resul.....:" + s_szresult);
// 11. return s_szResult
return s_szresult;
}
and here is my AsynkTask class
/ sending deal data to server and retreive response......
class CDealDataSent extends AsyncTask<String, Void, String> {
public JSONObject m_oResponseobject;
public ProgressDialog m_PDialog;
public CRegistrationDataStorage oRegisterStorage;
public CDealAppDatastorage item;
// #Override
protected void onPreExecute() {
super.onPreExecute();
m_PDialog = new ProgressDialog(getActivity());
m_PDialog.setMessage("Please wait while Loading Deals...");
m_PDialog.setCancelable(false);
m_PDialog.show();
}
#Override
protected String doInBackground(String... urls) {
return DealListing(urls[0], oRegisterStorage);// sending data to server...
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(String result) {
m_PDialog.dismiss();
try {
m_oResponseobject = new JSONObject(result);// getting response from server
final JSONArray posts = m_oResponseobject.optJSONArray("dealList");
s_oDataset = new ArrayList<CDealAppDatastorage>();
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);
item = new CDealAppDatastorage();
item.setM_szHeaderText(post.getString("dealname"));
item.setM_szsubHeaderText(post.getString("dealcode"));
item.setM_n_Image(m_n_FormImage[i]);
s_oDataset.add(item);
}
getResponse();
} catch (JSONException e) {
e.printStackTrace();
}
}
public void getResponse() throws JSONException {
if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Transaction Successful")) {
m_oAdapter = new CDealAppListingAdapter(s_oDataset);//creating object of adapter and addd setting odata to adapter for use.
m_RecyclerView.setAdapter(m_oAdapter);//adding adapter to recyclerview
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {
Toast.makeText(getActivity(), "Connection not avaliable", Toast.LENGTH_SHORT).show();
}else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Deal List Not Found")){
Toast.makeText(getActivity(),"No More Deals",Toast.LENGTH_SHORT).show();
}
System.out.println("agentCode...." + m_szMobileNumber);
System.out.println("password...." + m_szEncryptedPassword);
System.out.println("record////" + sz_RecordCount);
System.out.println("last:........" + sz_LastCount);
}
}
In asynkTask class get Response method update UI of class CDealListing

There are 3 ways
Call some method of your Fragment in onPostExecute()
Use BroadcastReceiver in onPostExecute()
use EventBus library for passing event to your Fragment.

One way would be to declare a listener interface and pass an instance of that interface (or perhaps a Runnable) into the AsyncTask's constructor.
In your fragment code:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
...
new CDealDataSent(new Runnable() {
#Override
public void run() {
// perform update UI code here
}
}).execute(m_DealListingURL);
...
}
In your AsyncTask code:
class CDealDataSent extends AsyncTask<String, Void, String> {
private final Runnable mOnPostExecuteRunnable;
CDealDataSent(Runnable onPostExecuteRunnable) {
mOnPostExecuteRunnable = onPostExecuteRunnable;
}
...
#Override
protected void onPostExecute(String result) {
...
if (mPostExecuteRunnable != null) {
mPostExecuteRunnable.run();
}
...
}
}
You could also use an anonymous subclass of AsyncTask from your fragment and override onPostExecute():
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
...
new CDealDataSent() {
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result); // be sure to call super first to do normal processing
... // update your UI here
}
}.execute(m_DealListingURL);
...
}
Note that both of these solutions are prone to Activity/Fragment leakage if you are not careful, as the parent class of the Runnable/anonymous subclass is retained as an implicit reference. Be sure to cancel any outstanding AsyncTasks if the user backs out of your activity in onDestroy().
You might be able to mitigate any potential leakage issues via a static nested class, or maybe pass a Handler instance to the AsyncTask for it to send a message on when onPostExecute() has done its job. See What's the correct way to implement AsyncTask? static or non static nested class? for a discussion on this.

2 recycler view adapter , the first showing images the second shows error No adapter attached; skipping layout

I have 2 recycler view adapter, the first is working perfect , the second one I am having the below error,
E/RecyclerView: No adapter attached; skipping layout
is it possible this is the mistake ?
if (mListener != null)
mListener.myMethod(Listitem);
both have different adapter
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView mRecyclerView1;
private RecyclerView.Adapter mAdapter1;
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(
new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false));
RecyclerOkHttpHandler handler = new RecyclerOkHttpHandler( this, new RecyclerOkHttpHandler.MyInterface() {
#Override
public void myMethod(ArrayList result) {
mAdapter = new MyAdapter(result,Search.this);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter );
}
});
handler.execute();
//second recycler
mRecyclerView1 = (RecyclerView) findViewById(R.id.my_recycler_view1);
mRecyclerView1.setHasFixedSize(true);
mRecyclerView1.setLayoutManager(
new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false));
RecyclerOkHttpHandler1 handler1 = new RecyclerOkHttpHandler1( this, new RecyclerOkHttpHandler1.MyInterface() {
#Override
public void myMethod(ArrayList result1) {
mAdapter1 = new MyAdapter1(result1,Search.this);
mAdapter1.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter1);
}
});
handler1.execute();
this is RecyclerOkHttpHandler
public class RecyclerOkHttpHandler extends AsyncTask<String, Void, String> {
private Context mContext;
private MyInterface mListener;
public RecyclerOkHttpHandler (Context context, MyInterface mListener){
mContext = context;
this.mListener = mListener;
}
public interface MyInterface {
public void myMethod(ArrayList result);
}
private final String Fetch_URL = "http://je.com/getdata.php";
// ArrayList<Listitem> Listitem;
ArrayList<CategoryList> Listitem;
int resulta;
OkHttpClient httpClient = new OkHttpClient();
ListView list;
String myJSON;
JSONArray peoples = null;
InputStream inputStream = null;
#Override
protected String doInBackground(String... params) {
Log.d("okhttp Fetch_URL", Fetch_URL);
Request.Builder builder = new Request.Builder();
builder.url(Fetch_URL);
Request request = builder.build();
String result = null;
try {
Response response = httpClient.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
inputStream = response.body().byteStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
resulta = 1; //"Success
// return response.body().bytes();
} catch (Exception e) {
Toast.makeText(mContext, "Connection failed, check your connection",
Toast.LENGTH_LONG).show();
e.printStackTrace(); }
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
#Override
protected void onPostExecute(String result){
if( resulta ==1){
myJSON=result;
Log.e("result",result);
showList();
}
else{
Log.e("d","there is an error on postexecute in okhhttphandler.java");
}
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
peoples = jsonObj.getJSONArray("result");
System.out.println("Length:"+peoples.length());
int J_length=peoples.length()-1;
//JSONObject maxj = peoples.getJSONObject(peoples.length() - 1);
// max of arrray
jsonObj= peoples.getJSONObject(J_length);
String j_id= jsonObj.getString("id");
int _id = Integer.parseInt(j_id);
// if (_id < d_id) {
System.out.println("Getting json result ");
Listitem = new ArrayList<CategoryList>();
for (int i = 0; i < peoples.length(); i++) {
JSONObject c = peoples.getJSONObject(i);
// String id ="2";
String id = c.getString("id");
String url = c.getString("url");
int intid = 0;
try {
intid = Integer.parseInt(id.toString());
} catch (NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
// DatabaseHandler db = new DatabaseHandler(mContext);
Log.d("Insert: ", "Inserting ..");
//db.addObjects(new Objects(intid, "Image1", url, "IMAGES", "Leb Funny"));
Listitem.add(new CategoryList(id, url));
System.out.println(Listitem);
}
//}
if (mListener != null)
mListener.myMethod(Listitem);
// GridViewAdapter adapter = new GridViewAdapter(mContext, R.layout.grid_item_layout, Listitem);
// gridView.setAdapter(gridAdapter);
// adapter.notifyDataSetChanged();
// list.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
RecyclerOkHttpHandler1 class
public class RecyclerOkHttpHandler1 extends AsyncTask<String, Void, String> {
private Context mContext;
private MyInterface mListener;
public RecyclerOkHttpHandler1(Context context, MyInterface mListener){
mContext = context;
this.mListener = mListener;
}
public interface MyInterface {
public void myMethod(ArrayList result);
}
private final String Fetch_URL = "http://je.com/getdata.php";
// ArrayList<Listitem> Listitem;
ArrayList<CategoryList> Listitem;
int resulta;
OkHttpClient httpClient = new OkHttpClient();
ListView list;
String myJSON;
JSONArray peoples = null;
InputStream inputStream = null;
#Override
protected String doInBackground(String... params) {
Log.d("okhttp Fetch_URL", Fetch_URL);
Request.Builder builder = new Request.Builder();
builder.url(Fetch_URL);
Request request = builder.build();
String result = null;
try {
Response response = httpClient.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
inputStream = response.body().byteStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
resulta = 1; //"Success
// return response.body().bytes();
} catch (Exception e) {
Toast.makeText(mContext, "Connection failed, check your connection",
Toast.LENGTH_LONG).show();
e.printStackTrace(); }
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}
return result;
}
#Override
protected void onPostExecute(String result){
if( resulta ==1){
myJSON=result;
Log.e("result",result);
showList();
}
else{
Log.e("d","there is an error on postexecute in okhhttphandler.java");
}
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
peoples = jsonObj.getJSONArray("result");
System.out.println("Length:"+peoples.length());
int J_length=peoples.length()-1;
//JSONObject maxj = peoples.getJSONObject(peoples.length() - 1);
// max of arrray
jsonObj= peoples.getJSONObject(J_length);
String j_id= jsonObj.getString("id");
int _id = Integer.parseInt(j_id);
System.out.println(j_id);
//max of
// if (_id < d_id) {
System.out.println("Getting json result ");
Listitem = new ArrayList<CategoryList>();
for (int i = 0; i < peoples.length(); i++) {
JSONObject c = peoples.getJSONObject(i);
// String id ="2";
String id = c.getString("id");
String url = c.getString("url");
int intid = 0;
try {
intid = Integer.parseInt(id.toString());
} catch (NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
// DatabaseHandler db = new DatabaseHandler(mContext);
Log.d("Insert: ", "Inserting ..");
//db.addObjects(new Objects(intid, "Image1", url, "IMAGES", "Leb Funny"));
Listitem.add(new CategoryList(id, url));
System.out.println(Listitem);
}
//}
if (mListener != null)
mListener.myMethod(Listitem);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
my adapter
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<CategoryList> mDataset;
Context mContext;
public class ImageViewHolder extends RecyclerView.ViewHolder {
//ImageView mImage;
public TextView txtHeader;
public TextView txtFooter;
public ImageView image;
public ImageViewHolder(View itemView) {
super (itemView);
txtHeader = (TextView) itemView.findViewById(R.id.firstLine);
txtFooter = (TextView) itemView.findViewById(R.id.secondLine);
image = (ImageView) itemView.findViewById(R.id.imagecateg);
}
}
public void add(int position, CategoryList item) { //changed from string to listitem
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(String item) {
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(ArrayList<CategoryList> myDataset, Context context) {
mDataset = myDataset;
mContext = context;
}
// Create new views (invoked by the layout manager)
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.category_search, parent, false);
// set the view's size, margins, paddings and layout parameters
ImageViewHolder vh = new ImageViewHolder(v);
return vh;
}
private static final int TYPE_IMAGE = 1;
private static final int TYPE_GROUP = 2;
#Override
public int getItemViewType(int position) {
// here your custom logic to choose the view type
return position;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(RecyclerView.ViewHolder TextViewHolder, int position) {
ImageViewHolder viewHolder = (ImageViewHolder) TextViewHolder;
// viewHolder.txtHeader.setText(...)
final CategoryList item;
// final String name = mDataset.get(position);
item = mDataset.get(position);
// viewHolder.txtHeader.setText(mDataset.get(position));
// this to be removed when added text
// viewHolder.txtHeader.setText(mDataset.get(position).getUrl());
Picasso.with(mContext)
.load(item.getUrl())
.placeholder(R.drawable.logo)
.fit()
.noFade()
.into(viewHolder.image);
/* viewHolder.txtFooter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
remove(item);
}
});*/
// viewHolder.txtFooter.setText("Footer: " + mDataset.get(position));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.size();
}
}
my adapter 1
public class MyAdapter1 extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<CategoryList> mDataset;
Context mContext;
public class ImageViewHolder extends RecyclerView.ViewHolder {
//ImageView mImage;
public TextView txtHeader;
public TextView txtFooter;
public ImageView image;
public ImageViewHolder(View itemView) {
super (itemView);
txtHeader = (TextView) itemView.findViewById(R.id.firstLine);
txtFooter = (TextView) itemView.findViewById(R.id.secondLine);
image = (ImageView) itemView.findViewById(R.id.imagecateg);
}
}
public void add(int position, CategoryList item) { //changed from string to listitem
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(String item) {
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter1(ArrayList<CategoryList> myDataset, Context context) {
mDataset = myDataset;
mContext = context;
}
// Create new views (invoked by the layout manager)
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.category_search, parent, false);
// set the view's size, margins, paddings and layout parameters
ImageViewHolder vh = new ImageViewHolder(v);
return vh;
}
private static final int TYPE_IMAGE = 1;
private static final int TYPE_GROUP = 2;
#Override
public int getItemViewType(int position) {
// here your custom logic to choose the view type
return position;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(RecyclerView.ViewHolder TextViewHolder, int position) {
ImageViewHolder viewHolder = (ImageViewHolder) TextViewHolder;
// viewHolder.txtHeader.setText(...)
final CategoryList item;
// final String name = mDataset.get(position);
item = mDataset.get(position);
// viewHolder.txtHeader.setText(mDataset.get(position));
// this to be removed when added text
// viewHolder.txtHeader.setText(mDataset.get(position).getUrl());
Picasso.with(mContext)
.load(item.getUrl())
.placeholder(R.drawable.logo)
.fit()
.noFade()
.into(viewHolder.image);
/* viewHolder.txtFooter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
remove(item);
}
});*/
// viewHolder.txtFooter.setText("Footer: " + mDataset.get(position));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.size();
}
}

Here you are setting adapter for mRecyclerView
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(
new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false));
RecyclerOkHttpHandler handler = new RecyclerOkHttpHandler( this, new RecyclerOkHttpHandler.MyInterface() {
#Override
public void myMethod(ArrayList result) {
mAdapter = new MyAdapter(result,Search.this);
mAdapter.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter );
}
});
handler.execute();
And here again you are setting adapter for same mRecyclerView, not for mRecyclerView1
//second recycler
mRecyclerView1 = (RecyclerView) findViewById(R.id.my_recycler_view1);
mRecyclerView1.setHasFixedSize(true);
mRecyclerView1.setLayoutManager(
new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false));
RecyclerOkHttpHandler1 handler1 = new RecyclerOkHttpHandler1( this, new RecyclerOkHttpHandler1.MyInterface() {
#Override
public void myMethod(ArrayList result1) {
mAdapter1 = new MyAdapter1(result1,Search.this);
mAdapter1.notifyDataSetChanged();
mRecyclerView.setAdapter(mAdapter1);
}
});
handler1.execute();
This is the reason for the issue (E/RecyclerView: No adapter attached; skipping layout).