Develop Reference

Update recycler View on a Fragment

I know there is other questions like this with answers but they don't help me...
So I have a Fragment, in this one I use Volley to get a JSON from a Web API. What I want to do is to "refresh" my recycler view with the data I get in my response.
I have tried to add a method in my adapter. But nothing append when I try to change my adapter in my Volley.onresponse() method.
There is my Fragment :
public class TicketsIncidentsFragment extends Fragment implements Response.ErrorListener, Response.Listener<String> {
RequestQueue queue;
StringRequest stringRequest;
ListView listView;
private RecyclerView recyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager layoutManager;
String url;
private TicketsIncidentsViewModel ticketsIncidentsViewModel;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
ticketsIncidentsViewModel =
ViewModelProviders.of(this).get(TicketsIncidentsViewModel.class);
View root = inflater.inflate(R.layout.fragment_ticketsincidents, container, false);
return root;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
RecyclerView recyclerView = (RecyclerView)getView().findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
layoutManager= new LinearLayoutManager(getActivity().getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
MyAdapterTI myAdapterTI=new MyAdapterTI();
recyclerView.setAdapter(myAdapterTI);
queue = Volley.newRequestQueue(getActivity().getApplicationContext());
url = "http://myip/select/ticketsI";
stringRequest = new StringRequest(GET, url, TicketsIncidentsFragment.this, TicketsIncidentsFragment.this);
queue.add(stringRequest);
}
#Override
public void onErrorResponse(VolleyError error) {
}
#Override
public void onResponse(String response) {
RecyclerView recyclerView = (RecyclerView)getView().findViewById(R.id.recyclerview);
Gson gsonTicketsIncidents = new Gson();
ResponseJson responseJson = new ResponseJson();
responseJson = (ResponseJson) gsonTicketsIncidents.fromJson(response, ResponseJson.class);
List<Object> listTicketsIncidents = responseJson.getResponse();
try {
JSONArray tis = new JSONArray(listTicketsIncidents.toArray());
ArrayList<String> date = new ArrayList<String>();
ArrayList<String> nomUser = new ArrayList<String>();
for (int i = 0 ; i< tis.length(); i++) {
JSONObject ticketIncident = tis.getJSONObject(i);
nomUser.add(ticketIncident.get("NOMUSER").toString());
date.add(ticketIncident.get("DateSAISIE").toString());
}
MyAdapterTI myAdapterTI=new MyAdapterTI();
myAdapterTI.getList(nomUser, date);
recyclerView.setAdapter(myAdapterTI);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
There is my adapter :
public class MyAdapterTI extends RecyclerView.Adapter<MyAdapterTI.MyViewHolder> {
private List<Pair<String, String>> TI;
public void getList(ArrayList<String> nomUser, ArrayList<String> date){
for(int i =0; i<nomUser.size();i++){
TI = Arrays.asList( Pair.create(nomUser.get(i), date.get(i)));
}
}
#NonNull
#Override
public MyAdapterTI.MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.list_cell_ti, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyAdapterTI.MyViewHolder holder, int position) {
Pair<String, String> pair = TI.get(position);
holder.display(pair);
}
#Override
public int getItemCount() {
return 0;
}
public class MyViewHolder extends RecyclerView.ViewHolder{
private TextView nomUser;
private TextView date;
private Pair<String, String> currentPair;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
nomUser=(TextView)itemView.findViewById(R.id.nomuser);
date=(TextView)itemView.findViewById(R.id.date);
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
}
});
}
public void display(Pair<String, String> pair) {
currentPair=pair;
nomUser.setText(pair.first);
date.setText(pair.second);
}
}
}
And there is the layout :
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#+id/listview_TI"
android:layout_width="97dp"
android:layout_height="34dp"
android:layout_marginTop="24dp"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.917"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.976" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="409dp"
android:layout_height="680dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.039" />
</androidx.constraintlayout.widget.ConstraintLayout>
Thank's for you're help
UPDATE :
Now my MyAdapter.getList() looks like this :
public void getList(ArrayList<String> nomUser, ArrayList<String> date){
for(int i =1; i<nomUser.size();i++){
TI.add(Pair.create(nomUser.get(i), date.get(i)));
}
notifyDataSetChanged();
}
But nothing change yet.
Last UPDATE :
The problem has been solved.
It's a ridiculous mistake I've made in my Adapter.
I used to return 0 but the solution is this :
#Override
public int getItemCount() {
return TI.size();
}

just change
#Override
public int getItemCount() {
return 0;
}
to
#Override
public int getItemCount() {
if(TI == null)
return 0;
else
return TI.size;
}

private List<Pair<String, String>> TI = new ArrayList();
public void getList(ArrayList<String> nomUser, ArrayList<String> date){
for(int i =0; i<nomUser.size();i++){
TI.add(Pair.create(nomUser.get(i), date.get(i)));
}
notifyDataSetChanged();
}

layoutManager= new LinearLayoutManager(getActivity().getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
MyAdapterTI myAdapterTI=new MyAdapterTI(getActivity().getApplicationContext(),ThisIsYourList);
recyclerView.setAdapter(myAdapterTI);
Don't do this in response
MyAdapterTI myAdapterTI=new MyAdapterTI();
recyclerView.setAdapter(myAdapterTI);
myAdapterTI make this global variable
Only update your list and then
myAdapterTI.notifyDataSetChanged();
Or in your adapter, you can do
this.notifyDataSetChanged(); ////in getList

multiple recyclerviews in one activity

I'm trying to make an app which has so many recyclerview, cardview init and all of them are in one activity. So, there are a lot of lists and these lists has horizontal orientation. I'm fetching data from JSON file and showing them on these lists. I know there is a long way to do it. But i believe there is more effective way to do it also. I'm not an expert. But i don't want to write so many different recyclerview, layoutmanager and adapter. So can you teach me how to do this?
Here is my codes;
Games.class;
public class Games extends AppCompatActivity {
RecyclerView recyclerView, recyclerView2;
ArrayList<ModelGames> modelGames;
private RequestQueue mQueue;
GamesAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_games);
modelGames = new ArrayList<>();
recyclerView = findViewById(R.id.gamesPageRecyclerView);
recyclerView2 = findViewById(R.id.gamesPageRecyclerView2);
mQueue = Volley.newRequestQueue(this);
releasedOn19();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView.LayoutManager gamesLiLayoutManager = linearLayoutManager;
recyclerView.setLayoutManager(gamesLiLayoutManager);
adapter = new GamesAdapter(this, modelGames);
recyclerView.setAdapter(adapter);
}
private void releasedOn19() {
String popularIn2019 = "https://api.rawg.io/api/games?dates=2019-01-01,2019-12-31&ordering=-added";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, popularIn2019, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("results");
for (int i = 0; i < jsonArray.length(); i++){
JSONObject result = jsonArray.getJSONObject(i);
String gameName = result.getString("name");
String gameImage = result.getString("background_image");
modelGames.add(new ModelGames(gameName, gameImage));
}
adapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mQueue.add(request);
}
}
ModelGames;
public class ModelGames {
private String text, image;
public ModelGames(String text, String image) {
this.text = text;
this.image = image;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
GamesAdapter;
public class GamesAdapter extends RecyclerView.Adapter<GamesAdapter.ViewHolder> {
private Context mContext;
private ArrayList<ModelGames> mList;
GamesAdapter(Context context, ArrayList<ModelGames> list){
mContext = context;
mList = list;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(mContext);
View view = layoutInflater.inflate(R.layout.rv_game_items, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
ModelGames getItem = mList.get(position);
TextView gameName = holder.game_title;
ImageView gameImage = holder.game_image;
Glide.with(mContext).asBitmap().load(getItem.getImage()).into(gameImage);
gameName.setText(mList.get(position).getText());
}
#Override
public int getItemCount() {
return mList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView game_image;
TextView game_title;
public ViewHolder(#NonNull View itemView) {
super(itemView);
game_image = itemView.findViewById(R.id.cardviewImage);
game_title = itemView.findViewById(R.id.cardviewText);
}
}
}
And here is my activity_games.xml. I added second recyclerview. But i didn't use that in anywhere
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="165dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:text="2019 Yılında Çıkan Oyunlar"
android:textStyle="bold"
android:textSize="18sp"
android:gravity="center_horizontal|center_vertical"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/gamesPageRecyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="165dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:text="2018 Yılında Çıkan Oyunlar"
android:textStyle="bold"
android:textSize="18sp"
android:gravity="center_horizontal|center_vertical"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/gamesPageRecyclerView2"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>

Items not displaying in RecyclerView

That's a weird problem I'm facing right now.
From my app, I'm fetch data from JSON file from a link then parse it with Volley. Now I want to display the data on a RecyclerView which doesn't seem to work, I'm pretty dure that my code is good but something doesn't seem to work and I can't find it.
activity_home.xml
This seems to render as I tested wiht background color:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activities.HomeActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_main_list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</androidx.recyclerview.widget.RecyclerView>
</androidx.constraintlayout.widget.ConstraintLayout>
Here is the activity code
HomeActivity.java:
public class HomeActivity extends AppCompatActivity {
private String url = "url/to/json.file";
private RecyclerView mList;
private LinearLayoutManager linearLayoutManager;
private List<News> newsList;
private RecyclerView.Adapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
newsList = new ArrayList<>();
mList = findViewById(R.id.rv_main_list);
adapter = new NewsAdapter(newsList);
mList.setHasFixedSize(true);
mList.setLayoutManager(new LinearLayoutManager(this));
mList.setAdapter(adapter);
getData();
}
This is the layout I'm inflating from the adapter and set data from JSON file
layout_single_item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/linearlayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#673AB7"
android:orientation="vertical">
<ImageView
android:id="#+id/iv_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:srcCompat="#mipmap/ic_launcher" />
<TextView
android:id="#+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
And the adapter class relevant code, I guess:
#Override
public NewsAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.layout_single_item, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(#NonNull NewsAdapter.ViewHolder holder, int position) {
final News currentNews = newsList.get(position);
holder.tvTitle.setText(String.valueOf(currentNews.getTitle()));
Glide.with(mContext.getApplicationContext()).load(currentNews.getImage()).into(holder.ivArticleImage);
}
holder.linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Uri newsUri = Uri.parse(currentNews.getNewsLink());
Intent toWebSiteIntent = new Intent(Intent.ACTION_VIEW, newsUri);
mContext.startActivity(toWebSiteIntent);
}
});
ViewHolder class:
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView tvTitle;
public ImageView ivArticleImage;
public LinearLayout linearLayout;
public ViewHolder(#NonNull View itemView) {
super(itemView);
this.tvTitle = itemView.findViewById(R.id.tv_title);
this.ivArticleImage = itemView.findViewById(R.id.iv_image);
linearLayout = itemView.findViewById(R.id.linearlayout);
}
}
Not sure what I'm doing wrong. Thanks for your time.
Edit:
getData function:
private void getData() {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading...");
progressDialog.show();
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(url, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
ArrayList<News> newsList = new ArrayList<>();
for(int i = 0; i < response.length(); i++){
try{
JSONObject jsonObject = response.getJSONObject(i);
News article = new News();
article.setTitle(jsonObject.getString("title"));
article.setImage(jsonObject.getString("image"));
}catch (JSONException e){
e.printStackTrace();
progressDialog.dismiss();
}
}
adapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
progressDialog.dismiss();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
Update 2:
Process: com.agencegg.apps.actualitecd, PID: 15002
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context
android.content.Context.getApplicationContext()' on a null object
reference
at com.agencegg.apps.actualitecd.adapters.NewsAdapter.onBindViewHolder(NewsAdapter.java:73)
at com.agencegg.apps.actualitecd.adapters.NewsAdapter.onBindViewHolder(NewsAdapter.java:31) //...

Add a method on your adapter like this:
public void update(ArrayList<News> newsList){
this.newsList = newsList;
}
Update your list on onResponse() method like this way:
#Override
public void onResponse(JSONArray response) {
ArrayList<News> newsList = new ArrayList<>();
for(int i = 0; i < response.length(); i++){
try{
JSONObject jsonObject = response.getJSONObject(i);
News article = new News();
article.setTitle(jsonObject.getString("title"));
article.setImage(jsonObject.getString("image"));
newsList.add(news).
}catch (JSONException e){
e.printStackTrace();
progressDialog.dismiss();
}
}
adapter.update(newsList)
adapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}

Android volley recyclerview not showing data

I spent a lot of time debugging this code but unfortunately could not find the bug, can someone help me find the issue in this code. I am not able to see data on the activity page. Although I have found the I am getting response data from the server.
Activity Class
public class SelectServiceActivity extends AppCompatActivity {
private TextView textView;
private RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_service);
recyclerView = (RecyclerView) findViewById(R.id.select_service_rv);
String serviceTypeId = getIntent().getStringExtra(AppConstants.SELECTED_SERVICE_TYPE_ID);
getProductDetailsByProductId(serviceTypeId);
}
private void getProductDetailsByProductId(String serviceTypeId) {
final List<SelectServiceBean> selectServiceList = new ArrayList<>();
final JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(
Request.Method.GET,
APIEndpoints.SERVICE_LIST_URI + serviceTypeId,
null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response.length() > 0) {
for (int i = 0; i < response.length(); i++) {
try {
selectServiceList.add(DatabaseObjectsMapper.selectServiceBeanMapper((JSONObject) response.get(i)));
} catch (JSONException e) {
Toast.makeText(SelectServiceActivity.this, "Something went wrong : " + e.getMessage(), Toast.LENGTH_LONG).show();
}
}
recyclerView.setAdapter(new SelectServiceAdapter(getApplicationContext(),selectServiceList));
} else {
Toast.makeText(SelectServiceActivity.this, "No Response From Server!", Toast.LENGTH_LONG).show();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(SelectServiceActivity.this, error.toString(), Toast.LENGTH_LONG).show();
}
});
VolleySingleton.getInstance(SelectServiceActivity.this).addToRequestQueue(jsonArrayRequest);
}
}
Adapter Class
public class SelectServiceAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private List<SelectServiceBean> selectServiceList;
public SelectServiceAdapter(final Context context, final List<SelectServiceBean> selectServiceList) {
this.context = context;
this.selectServiceList = selectServiceList;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View row = LayoutInflater.from(context).inflate(R.layout.item_select_service, parent, false);
return (new Item(row));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((Item) holder).serviceTypeIssue.setText(selectServiceList.get(position).getServiceTypeIssue());
((Item) holder).serviceTypeIssue.setText(selectServiceList.get(position).getServiceType());
}
#Override
public int getItemCount() {
return selectServiceList.size();
}
public static class Item extends RecyclerView.ViewHolder {
private TextView serviceTypeIssue;
private TextView serviceType;
public Item(View view) {
super(view);
serviceTypeIssue = view.findViewById(R.id.service_type_issue);
}
}
}
Single View Item
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<android.support.v7.widget.AppCompatTextView
android:id="#+id/service_type_issue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="Sample text" />
<android.support.v7.widget.AppCompatCheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true" />
</RelativeLayout>
<View
android:layout_width="match_parent"
android:layout_height="1sp"
android:background="#color/lightGrey" />
</LinearLayout>
Recyclerview File
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/select_service_rv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

From docs
A LayoutManager must be provided for RecyclerView to function.
You need to add the layoutManager
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_service);
recyclerView = (RecyclerView) findViewById(R.id.select_service_rv);
LinearLayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
//^^^^^^^^^^^
recyclerView.setLayoutManager(mLayoutManager);
//^^^^^^^^^^^^^^^^^^^^
String serviceTypeId = getIntent().getStringExtra(AppConstants.SELECTED_SERVICE_TYPE_ID);
getProductDetailsByProductId(serviceTypeId);
}
Improvement :
Initialize serviceType in Item class and use it in onBindViewHolder
public Item(View view) {
super(view);
serviceTypeIssue = view.findViewById(R.id.service_type_issue);
serviceType = view.findViewById(R.id.yourID);
//^^^^^^^
}
Keep a reference to new SelectServiceAdapter so that later you can use notify functions for more optimal performance
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((Item)holder).serviceTypeIssue.setText(selectServiceList.get(position).getServiceTypeIssue());
((Item)holder).serviceType.setText(String.valueOf(selectServiceList.get(position).getServiceType()));
//^^^^^^^^
}

No adapter attached skipping layout in recyclerview using fragment

I got an error in recycler view using fragment. I have read stackoverflow answers but it not solve. PLease help me.
Recycler reference tutorial
http://www.android-examples.com/android-recyclerview-listview-with-imageview-textview-json/
When i use in without fragment it work as fine but in fragment it shows error.
My codes shown below.
FriendsFragment.java
public class FriendsFragment extends android.support.v4.app.Fragment {
List<GetDataAdapter> GetDataAdapter1;
RecyclerView recyclerView;
RecyclerView.LayoutManager recyclerViewlayoutManager;
RecyclerView.Adapter recyclerViewadapter;
String GET_JSON_DATA_HTTP_URL = "http://192.168.43.7/work/ecom/2/1.php";
String JSON_IMAGE_TITLE_NAME = "image_title";
String JSON_IMAGE_URL = "image_url";
JsonArrayRequest jsonArrayRequest ;
RequestQueue requestQueue ;
public FriendsFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_friends, container, false);
GetDataAdapter1 = new ArrayList<>();
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview1);
recyclerView.setHasFixedSize(true);
recyclerViewlayoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(recyclerViewlayoutManager);
JSON_DATA_WEB_CALL();
// Inflate the layout for this fragment
return rootView;
}
public void JSON_DATA_WEB_CALL(){
jsonArrayRequest = new JsonArrayRequest(GET_JSON_DATA_HTTP_URL,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d("LOGTAG", "Response :"+response);
JSON_PARSE_DATA_AFTER_WEBCALL(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(jsonArrayRequest);
}
public void JSON_PARSE_DATA_AFTER_WEBCALL(JSONArray array){
for(int i = 0; i<array.length(); i++) {
GetDataAdapter GetDataAdapter2 = new GetDataAdapter();
JSONObject json = null;
try {
json = array.getJSONObject(i);
GetDataAdapter2.setImageTitleNamee(json.getString(JSON_IMAGE_TITLE_NAME));
GetDataAdapter2.setImageServerUrl(json.getString(JSON_IMAGE_URL));
} catch (JSONException e) {
e.printStackTrace();
}
GetDataAdapter1.add(GetDataAdapter2);
}
recyclerViewadapter = new RecyclerViewAdapter(GetDataAdapter1, getContext());
recyclerView.setAdapter(recyclerViewadapter);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onDetach() {
super.onDetach();
}
}
RecyclerViewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
List<GetDataAdapter> getDataAdapter;
ImageLoader imageLoader1;
public RecyclerViewAdapter(List<GetDataAdapter> getDataAdapter, Context context){
super();
this.getDataAdapter = getDataAdapter;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder Viewholder, int position) {
GetDataAdapter getDataAdapter1 = getDataAdapter.get(position);
imageLoader1 = ServerImageParseAdapter.getInstance(context).getImageLoader();
imageLoader1.get(getDataAdapter1.getImageServerUrl(),
ImageLoader.getImageListener(
Viewholder.networkImageView,//Server Image
R.mipmap.ic_launcher,//Before loading server image the default showing image.
android.R.drawable.ic_dialog_alert //Error image if requested image dose not found on server.
)
);
Viewholder.networkImageView.setImageUrl(getDataAdapter1.getImageServerUrl(), imageLoader1);
Viewholder.ImageTitleNameView.setText(getDataAdapter1.getImageTitleName());
}
#Override
public int getItemCount() {
return getDataAdapter.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public TextView ImageTitleNameView;
public NetworkImageView networkImageView ;
public ViewHolder(View itemView) {
super(itemView);
ImageTitleNameView = (TextView) itemView.findViewById(R.id.textView_item) ;
networkImageView = (NetworkImageView) itemView.findViewById(R.id.VollyNetworkImageView1) ;
}
}
}
fragment_friends.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.ecom.fragment2.FriendsFragment">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</RelativeLayout>
recyclerview_items.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/cardview1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardElevation="3dp"
card_view:contentPadding="3dp"
card_view:cardCornerRadius="3dp"
card_view:cardMaxElevation="3dp"
>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<com.android.volley.toolbox.NetworkImageView
android:id="#+id/VollyNetworkImageView1"
android:layout_width="150dp"
android:layout_height="100dp"
android:src="#mipmap/ic_launcher"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Image Name"
android:id="#+id/textView_item"
android:layout_centerVertical="true"
android:layout_toRightOf="#+id/VollyNetworkImageView1"
android:layout_toEndOf="#+id/VollyNetworkImageView1"
android:layout_marginLeft="20dp"/>
</RelativeLayout>
</android.support.v7.widget.CardView>

You should make your custom linearlayout manager. Sometimes there is a scenario: If you scroll fast then there causes Exception in you recycleView. To avoid this problem you have to implement your custom layout manager like below:
public class CustomLinearLayoutManager extends LinearLayoutManager {
private Context mContext;
public CustomLinearLayoutManager(Context context, int orientation,boolean reverseLayout){
super(context, orientation, reverseLayout);
mContext=context;
}
#Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
try {
super.onLayoutChildren(recycler, state);
} catch (Exception e) {
Constants.errorLog("onLayoutChildren :" , e.toString());
}
}
}
Now use this layout manager in your recycleview like this:
LinearLayoutManager recyclerViewlayoutManager = new CustomLinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(recyclerViewlayoutManager );
Hope you will now avoid the exception i mentioned.

The problem is adding permission in manifest file.
Add
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
It work as fine.