Develop Reference

I am facing "No adapter attached; skipping layout" error

When I am writing the title of my question, then this site recommends me some answer but I can't find my answer that's why I am writing a new one. I am trying simple RecyclerView and it's run successfully but when I am fetching data from internet using volley library then I face this error
here is my code
BusinessActivity.java
public class BusinessActivity extends AppCompatActivity {
private final String URL = "https://api.myjson.com/bins/a44ec";
private JsonArrayRequest request;
private RequestQueue requestQueue;
private List<ArticleModel> articleList;
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_business);
articleList = new ArrayList<>();
recyclerView = findViewById(R.id.business_recyclerView);
jsonParse();
}
private void jsonParse() {
request = new JsonArrayRequest(URL, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
JSONObject jsonObject = null;
for (int i=0;i<response.length();i++){
try {
jsonObject = response.getJSONObject(i);
ArticleModel article = new ArticleModel();
article.setTitle(jsonObject.getString("title"));
article.setAuthor(jsonObject.getString("author"));
article.setDescription(jsonObject.getString("description"));
article.setPublishedAt(jsonObject.getString("publishedAt"));
article.setUrlToImage(jsonObject.getString("urlToImage"));
articleList.add(article);
} catch (JSONException e) {
e.printStackTrace();
}
}
setRecyclerView(articleList);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(BusinessActivity.this);
requestQueue.add(request);
}
private void setRecyclerView(List<ArticleModel> articleList) {
BusinessAdapter adapter = new BusinessAdapter(articleList,this);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
}
BusinessAdapter.java
public class BusinessAdapter extends RecyclerView.Adapter<BusinessAdapter.MyViewHolder> {
private List<ArticleModel> articleModels;
private Context context;
RequestOptions options;
public BusinessAdapter(List<ArticleModel> articleModels, Context context) {
this.articleModels = articleModels;
this.context = context;
options = new RequestOptions().centerCrop().placeholder(R.drawable.ic_launcher_background).error(R.drawable.ic_launcher_background);
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.category_row,parent,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
ArticleModel articleModel = articleModels.get(position);
holder.title.setText(articleModel.getTitle());
holder.author.setText(articleModel.getAuthor());
holder.desc.setText(articleModel.getDescription());
holder.date.setText(articleModel.getPublishedAt());
Glide.with(context).load(articleModel.getUrlToImage()).apply(options).into(holder.image);
}
#Override
public int getItemCount() {
return articleModels.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView title,author,desc,date;
ImageView image;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
title = itemView.findViewById(R.id.title);
author = itemView.findViewById(R.id.author);
desc = itemView.findViewById(R.id.detail);
date = itemView.findViewById(R.id.date);
image = itemView.findViewById(R.id.image);
}
}
}
Error log
2020-04-01 00:15:53.117 8821-8821/com.atc.newsappproject E/RecyclerView: No adapter attached; skipping layout
2020-04-01 00:15:53.118 1752-1787/? E/storaged: getDiskStats failed with result NOT_SUPPORTED and size 0
How can I solve this?
Thank you.

This error usually happens when you don't set the RecyclerView when you create your Fragment or Activity. To fix this you need to:
Set your RecyclerView in onCreate instead of when you pick up result. You set it with an empty list.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_business);
articleList = new ArrayList<>();
recyclerView = findViewById(R.id.business_recyclerView);
setRecyclerView(articleList);
jsonParse();
}
You create a setter in your Adapter
public void setArticles(ArrayList<ArticleModel> articles){
this.articles = articles;
notifyDataSetChanged();
}
Create private BusinessAdapter adapter; below private RecyclerView recyclerView;
Finally in your onResponse you call adapter.setArticles(articlesList);
Here is a link with a lot of solutions if you still got issue: recyclerview No adapter attached; skipping layout

Activity Is Taking Too Much Time To Load

I am a beginner at android. I have created a recyclerview which parses data from a JSON. I have set an onclick listener to all recyclerview item which opens new activity and show details of the recycler view item. My problem is when I click a recyclerview item it takes 4-5 seconds to load can I make this faster please help.
My Activity Code
public class Tab1 extends Fragment implements ExampleAdapter.onItemClickListener{
private RecyclerViewPager mRecyclerView;
private ExampleAdapter mExampleAdapter;
private ArrayList<ExampleItem> mExampleList;
private RequestQueue mRequestQueue;
public static final String EXTRA_URL = "imageUrl";
private ShimmerFrameLayout mShimmerViewContainer;
Button sharebuttonz;
File imagePathz;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
((AppCompatActivity) getActivity()).getSupportActionBar().hide();
View rootView = inflater.inflate(R.layout.tab1, container, false);
mRecyclerView = rootView.findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mShimmerViewContainer = rootView.findViewById(R.id.shimmer_view_container);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
// Set the adapter here.
// Use getActivity() instead of getContext()
parseJson();
mExampleAdapter = new ExampleAdapter(getActivity(), mExampleList);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(Tab1.this);
return rootView;
}
private void parseJson() {
String url = "http://maranamassapp.cf/json_getdata.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("server_response");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject ser = jsonArray.getJSONObject(i);
String creatorname = ser.getString("head");
String imageUrl = ser.getString("image");
String cat = ser.getString("content");
String postdate = ser.getString("weburl");
String dateall = ser.getString("date");
int type = ser.getInt("type");
mExampleList.add(new ExampleItem(imageUrl, creatorname, cat, postdate, dateall,type));
}
// Just call notifyDataSetChanged here
mExampleAdapter.notifyDataSetChanged();
mShimmerViewContainer.stopShimmerAnimation();
mShimmerViewContainer.setVisibility(View.GONE);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
public void onItemClick(int position) {
Intent detailintent = new Intent(getContext(), DetailActivity.class);
ExampleItem clickeditem = mExampleList.get(position);
detailintent.putExtra(EXTRA_URL, clickeditem.getmDate());
startActivity(detailintent);
}
}
My Adapter Code
public class ExampleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context mContext;
private ArrayList<ExampleItem> mExampleList;
private onItemClickListener mListener;
public interface onItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(onItemClickListener listener) {
mListener = listener;
}
public class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextViewCreator;
public TextView mTextViewCat;
public TextView mDateAll;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image_view);
mTextViewCreator = itemView.findViewById(R.id.text_view_creator);
mTextViewCat = itemView.findViewById(R.id.text_view_cat);
mDateAll = itemView.findViewById(R.id.date_views);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (mListener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
mListener.onItemClick(position);
}
}
}
});
}
}

Implement listener on RecyclerView instead of individual item. This is better as it avoids unnecessary OnClickListener creation.
As for the slow loading of activity, this seems to be layout optimization issue. As suggested by Oğuzhan Döngül, you should find out if problem persists on actual device. I would suggest reading Improving Layout Performance nevertheless, they show many tricks which will be of great help.

How to show recently added items first in recyclerview

I'm creating an app similar to the instagram app but only admin can add contents. i used python django for my backend but when i add new item to my django database, it comes last on the recyclerview. I want it to be in a way that, when i add new item, it comes first when you open my app like the way instagram shows recent items first.
This is my custom Adapter class
public class DealAdapter extends RecyclerView.Adapter<DealAdapter.DealHolder> {
Context context;
ArrayList<Deal> arrayList;
public DealAdapter(Context context, ArrayList<Deal> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
#Override
public DealHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.deal_cardview, parent, false);
DealHolder dealHolder = new DealHolder(v);
return dealHolder;
}
#Override
public void onBindViewHolder(DealHolder holder, int position) {
Deal deal = arrayList.get(position);
holder.title.setText(deal.getTitle());
Picasso.with(context).
load(deal.getImage()).
placeholder(R.drawable.loading).
error(android.R.drawable.stat_notify_error).
into(holder.image);
}
#Override
public int getItemCount() {
if(arrayList != null) {
return arrayList.size();
}else {
return 0;
}
}
public class DealHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView image;
public DealHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.tvTitle);
image = (ImageView) itemView.findViewById(R.id.ivImage);
}
}
}
This is my main Activity class
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
String TAG = "MainActivity";
ImageButton ibMore;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.rvRecyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
String url = "http://192.168.43.2/api/deals/?format=json";
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
ArrayList<Deal> userList = new JsonConverter<Deal>().
toArrayList(response, Deal.class);
DealAdapter adapter = new DealAdapter(getApplicationContext(), userList);
recyclerView.setAdapter(adapter);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d(TAG, error.toString());
Toast.makeText(getApplicationContext(), "Something Went wrong: " + "'" + error + "'", Toast.LENGTH_LONG).show();
}
});
MySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest);
}
}

Okay so this is what worked for me. After getting JSON and converting to ArrayList, i called it in "Collections.reverse(arrayList);" before adding it to the adapter as shown below.
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
ArrayList<Deal> userList = new JsonConverter<Deal>().
toArrayList(response, Deal.class);
Collections.reverse(userList);
DealAdapter adapter = new DealAdapter(getApplicationContext(), userList);
recyclerView.setAdapter(adapter);
}

Believe me, only this single line worked for me. Use this :
Collections.reverse(list);
Where list will be your list containing any type of object

Max Billionaire,
If your "userList" contain single item then do like this
adapter.add(0, userList.get(0));
adapter.notifyItemInserted(0);
if you have adapter instance then just refresh the adapter like this
adapter.notifyDataSetChanged();
instead
DealAdapter adapter = new DealAdapter(getApplicationContext(), userList);
recyclerView.setAdapter(adapter);

To display the recent added data to the top of the list do this
yourArrayListOfData.add(0, newAddedData);
adapter.notifyDataSetChanged();

RecyclerView not populating inside fragment using volley

My recyclerview is not populating inside fragment. I am getting proper response from volley. I have parsed the JSON in arraylist in proper format only problem is that recyclerview is not populating.
MyFragment.java
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_undekha_tadka, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
myVolleyOperation(view);
return view;
}
private void myVolleyOperation(View v) {
volleySingleton = VolleySingleton.getInstance();
requestQueue = volleySingleton.getRequestQueue();
String url = "http://abcd.com/undekha.html";
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
jsonParsing(response);
Toast.makeText(getContext(), response, Toast.LENGTH_SHORT).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), "ERROR\n" + error.toString(), Toast.LENGTH_SHORT).show();
}
});
requestQueue.add(stringRequest);
recyclerViewAdapter = new RecyclerViewAdapter(undekhaList, v.getContext());
layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(recyclerViewAdapter);
}
RecyclerViewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> {
ArrayList<UndekhaModel> myArrayList = new ArrayList<>();
Context context;
VolleySingleton volleySingleton;
ImageLoader imageLoader;
public RecyclerViewAdapter(ArrayList<UndekhaModel> myArrayList, Context context) {
this.myArrayList = myArrayList;
this.context = context;
volleySingleton = VolleySingleton.getInstance();
imageLoader = volleySingleton.getImageLoader();
}
#Override
public RecyclerViewAdapter.RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_row, parent, false);
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view, context, myArrayList);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(final RecyclerViewAdapter.RecyclerViewHolder holder, int position) {
UndekhaModel undekhaModel = myArrayList.get(position);
holder.title.setText(undekhaModel.getTitle());
String loadUrl = "http://img.youtube.com/vi/" + undekhaModel.getId() + "/0.jpg";
if (loadUrl!=null){
imageLoader.get(loadUrl, new ImageLoader.ImageListener() {
#Override
public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
holder.thumbnail.setImageBitmap(response.getBitmap());
}
#Override
public void onErrorResponse(VolleyError error) {
holder.thumbnail.setImageResource(R.mipmap.ic_launcher);
}
});
}
}
#Override
public int getItemCount() {
return myArrayList.size();
}
public static class RecyclerViewHolder extends RecyclerView.ViewHolder {
TextView title;
ImageView thumbnail;
ArrayList<UndekhaModel> modelArrayList = new ArrayList<>();
Context context;
public RecyclerViewHolder(View itemView, final Context ctx, final ArrayList<UndekhaModel> modelArrayList) {
super(itemView);
this.context = ctx;
this.modelArrayList = modelArrayList;
title = (TextView) itemView.findViewById(R.id.tvTitle);
thumbnail = (ImageView) itemView.findViewById(R.id.ivShow);
}
}
}

Your method jsonParsing() needs to populate data for your RecyclerViewAdapter, needs to notify of the update and the adapter needs to return the correct count of items it is managing. Right now its getItemCount() is always returning 0, so the RecyclerView does not think there is anything to show.

Same issue than here
https://stackoverflow.com/a/35802948/2144418
Try setting the adapter before the layout manager
Change the last two lines on myVolleyOperation to this
recyclerView.setAdapter(recyclerViewAdapter);
recyclerView.setLayoutManager(layoutManager);

Recyclerview in fragmnet using volley json data?

please any one explain RecyclerView in fragment using volley to get json data.
Already i refered below link coding Google recyclerview in fragment
this is my first project in android, so i cannot understand that coding.
Please any one help me.
My fragmnet Coding:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View drawer = inflater.inflate(R.layout.fragment_progress, container, false);
orderLists = new ArrayList<>();
getProgressData();
recyclerView = (RecyclerView) drawer.findViewById(R.id.progress);
adapter = new ProgressOrderListAdapter(orderLists, this);
adapter.clearAdaptor();
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return recyclerView;
}
private void getProgressData(){
String mobilecustomertoken = SharedPreferencesManager.readPreferenceString("MobileCustomerToken", "D/N");
JSONObject progressData = new JSONObject();
try{
progressData.put("mobilecustomertoken", mobilecustomertoken);
JsonObjectRequest progressObject = new JsonObjectRequest(1, Common.OrderDetails + "progress", progressData, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject progressResponse) {
Log.d("Responseprogress", progressResponse.toString());
try {
int status = progressResponse.getInt("status");
if(status == 1) {
progressOrderProgress(progressResponse);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
Log.d("Response", "PROGRESS ERROR");
}
});
progressObject.setShouldCache(false);
ServiceBellApp.getInstance().addToRequestQueue(progressObject);
}
catch (JSONException localJSONException){
localJSONException.printStackTrace();
return;
}
}
private void progressOrderProgress(JSONObject progressResponse) throws JSONException {
JSONArray result = progressResponse.getJSONArray("orderdata");
OrderList orderListModule = new OrderList();
for(int i=0; i<result.length(); i++){
JSONObject orderData = result.getJSONObject(i);
orderListModule.setPackage_name(orderData.getString("package_name"));
orderListModule.setOrderdate(orderData.getString("orderdate"));
orderListModule.setServicedate(orderData.getString("servicedate"));
orderListModule.setServicetime(orderData.getString("servicetime"));
orderListModule.setOrderid(orderData.getString("orderid"));
orderListModule.setOrdstatus(orderData.getString("ordstatus"));
orderListModule.setOrderamount(orderData.getInt("orderamount"));
}
orderLists.add(orderListModule);
}
My adapter code:
public class OrderListAdapter extends RecyclerView.Adapter<OrderListAdapter.ViewHolder> {
List<OrderList> List;
private FragmentPending mContext;
public OrderListAdapter(List<OrderList> List, FragmentPending context) {
this.mContext = context;
this.List = List;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.order_list_view, null);
ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
OrderList orderListsPos = List.get(position);
// this is where the data for each item is assigned
holder.textViewPackageName.setText(orderListsPos.getPackage_name());
holder.textOrderdate.setText(orderListsPos.getOrderdate());
holder.textServicedate.setText(orderListsPos.getServicedate());
holder.textServicetime.setText(orderListsPos.getServicetime());
holder.textOrderid.setText(orderListsPos.getOrderid());
holder.textOrderamount.setText("Rs." + orderListsPos.getOrderamount());
holder.textStatus.setText(orderListsPos.getOrdstatus());
}
#Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewPackageName;
public TextView textServicedate;
public TextView textServicetime;
public TextView textOrderdate;
public TextView textOrderid;
public TextView textOrderamount;
public TextView textStatus;
public ViewHolder(View itemView) {
super(itemView);
textViewPackageName = (TextView) itemView.findViewById(R.id.productName);
textOrderdate = (TextView) itemView.findViewById(R.id.orderdate);
textOrderid = (TextView) itemView.findViewById(R.id.orderno);
textOrderamount = (TextView) itemView.findViewById(R.id.orderprice);
textStatus = (TextView) itemView.findViewById(R.id.orderstatus);
}
}}

First you need four things
1 ) layout that holds the each recycler view layout item
2 ) A view holder for creating each layout
3 ) A Model Class to holds the data
4 ) Recycler Adaptor which deals with the data for the Each Layout item
FIrst create a layout item
for eample lets create a single view with only TextView in it
XML
each_item.xml
<TextView
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:gravity="start|center_vertical"
android:textColor="#color/white"
android:textSize="18sp" />
and lets now create a view holder
i will post both code for the view holder and RecyclerAdaptor
public class Adaptor extends RecyclerView.Adapter<Adaptor.ViewHolder> {
List<Model> List = Collections.emptyList();
private Context mContext;
private LayoutInflater inflater;
public Adaptor(Context context, List<Model> List) {
inflater = LayoutInflater.from(context);
this.mContext = context;
this.List = List;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.each_item, parent, false);
final ViewHolder holder = new ViewHolder(view);
// this is where the each item is inflated.
return holder;
}
#Override
public void onBindViewHolder(WinnersViewHolder holder, int position) {
Model mModel = List.get(position);
// this is where the data for each item is assigned
holder.nameView.setText("" + mModel.getName());
}
#Override
public int getItemCount() {
return List.size();
}
public void clearAdaptor() {
List.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
protected TextView nameView;
public ViewHolder(View itemView) {
super(itemView);
this.nameView = (TextView) itemView.findViewById(R.id.name);
}
}
}
Now the model class
public class Model {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name= name;
}
}
Now the back end is done, Lets implement it on the Fragment
List<Model> List = new ArrayList<>();
private RecyclerView mRecyclerView;
private Adaptor adaptor;
public Fragment() {
// constructor of fragment
// Required empty public constructor
}
in the onCreatView() get the id of recyclerView
View fragmentView = inflater.inflate(R.layout.fragment_layout, container, false);
mRecyclerView = (RecyclerView) fragmentView .findViewById(R.id.recycler_view);
and then pass the data to the Adaptor by creating its object
adaptor = new Adaptor(getContext(), List);
adaptor.clearAdaptor();
mRecyclerView.setAdapter(adaptor);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
You are done now, only thing pending is if you are accessing data form server call notifyDataSetChanged() or adaptor = new Adaptor(getContext(), getList()); where the getList() returns the Model data and do not call adaptor.clearAdaptor() .
hope this helps ..
EDIT
you can two ways infalte the each layout item .. one is above and second is in onCreateViewHolder
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_item, null);

Check this link It is really helpful for beginners for understanding concepts from start to mastering the RecyclerView.
https://github.com/codepath/android_guides/wiki/Using-the-RecyclerView
Hope this helps you to understand recycler view concepts.

RecycerView + Fragment + Volley
Fragment Code:
public class DogListFragment extends Fragment{
private RecyclerView rv;
private StaggeredGridLayoutManager llm;
private DogListAdapter adapter;
private ArrayList<DogModel> dogList;
private Context context;
public static DogListFragment getInstance(){
return new DogListFragment();
}
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
dogList = new ArrayList<>();
adapter = new DogListAdapter(context, dogList, this);
getListFromServer();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.fragment_dog_list, parent, false);
rv = view.findViewById(R.id.rv);
llm = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
rv.setLayoutManager(llm);
rv.setAdapter(adapter);
return view;
}
public void getListFromServer(){
String url = "https://dog.ceo/api/breed/hound/images/random/20";
RequestQueue requestQueue = Volley.newRequestQueue(context);
StringRequest request = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
JSONArray array = jsonObject.getJSONArray("message");
for(int i=0;i<array.length();i++){
String imageUrl = array.getString(i);
dogList.add(new DogModel(imageUrl));
}
adapter.updateDataSet(dogList);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}
);
requestQueue.add(request);
}
}
Full code
Woof Repository
It has the following implementations
Fragment communication via interface
Reusing fragment by
getSupportFragmentManager().findFragmentByTag(TAG)
Which lifecycle method should have API call so that it is called just
once
How to save RecylcerView state in Fragment (Scroll position + content)
Pagination in RecyclerView
Rest Calls (Volley)
Image Rendering (Glide)
JSON Parsing