Updating data in a recyclerview

Updating data in a recyclerview - android

In my project a read data from a CMS I created through a JSON response. My problem is when I click the refresh button the data are read twice!. Here is my fragment's code.
public class FootballNews extends Fragment {
public static final String TAG = "ManuApp";
private static final String IMAGE_URL = "http://xxx//manucms/football_news_images/" ;
private List<FootballNewsObject> listItemsList;
private RecyclerView mRecyclerView;
private FootballNewsAdapter adapter;
public FootballNews() {
// Required empty public constructor
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setRetainInstance(true);
View v = inflater.inflate(R.layout.fragment_football_news, container, false);
// Inflate the layout for this fragment
listItemsList = new ArrayList<FootballNewsObject>();
mRecyclerView = (RecyclerView)v.findViewById(R.id.recycler_view);
//mRecyclerView.addItemDecoration(new HorizontalDividerItemDecoration.Builder(getActivity()).color(Color.BLACK).build());
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(linearLayoutManager);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
updateList();
}
public void updateList() {
//declare the adapter and attach it to the recyclerview
adapter = new FootballNewsAdapter(getActivity(), listItemsList);
mRecyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
// Instantiate the RequestQueue.
RequestQueue queue = Volley.newRequestQueue(getActivity());
// Clear the adapter because new data is being added from a new subreddit
//adapter.clearAdapter();
//showPD();
// Request a string response from the provided URL.
JsonArrayRequest jsObjRequest = new JsonArrayRequest(Request.Method.GET, Config.URL_FOOTBALL_NEWS, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
//hidePD();
// Parse json data.
// Declare the json objects that we need and then for loop through the children array.
// Do the json parse in a try catch block to catch the exceptions
try {
for (int i = 0; i < response.length(); i++) {
JSONObject post = response.getJSONObject(i);
FootballNewsObject item = new FootballNewsObject();
item.setTitle(post.getString("title"));
item.setImage(IMAGE_URL + post.getString("news_image"));
item.setArticle(post.getString("article"));
listItemsList.add(item);
}
} catch (JSONException e) {
e.printStackTrace();
}
// Update list by notifying the adapter of changes
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
//hidePD();
}
});
jsObjRequest.setRetryPolicy(new RetryPolicy() {
#Override
public int getCurrentTimeout() {
return 50000;
}
#Override
public int getCurrentRetryCount() {
return 50000;
}
#Override
public void retry(VolleyError error) throws VolleyError {
}
});
queue.add(jsObjRequest);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
getActivity().getMenuInflater().inflate(R.menu.main, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if(id == R.id.refresh){
if(isOnline()) {
updateList();
}else{
Toast.makeText(getActivity(),"There is no internet connection",Toast.LENGTH_SHORT).show();
}
}
return super.onOptionsItemSelected(item);
}
protected boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager)getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
} else {
return false;
}
}
}
Basically I am running the updateList method twice. Once in the onActivityCreated(...) method,and secondly inside the onOptionsItemSelected(...).
Finally here is my adapter.
public class FootballNewsAdapter extends RecyclerView.Adapter<FootballNewsRowHolder>{
private List<FootballNewsObject> footballNewsObjectList;
private Context mContext;
private ImageLoader mImageLoader;
private int focused = 0;
public FootballNewsAdapter(Activity activity, List<FootballNewsObject> footballNewsObjectList){
this.footballNewsObjectList = footballNewsObjectList;
this.mContext = activity;
}
#Override
public FootballNewsRowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.football_news_row,null);
final FootballNewsRowHolder holder = new FootballNewsRowHolder(v);
return holder;
}
#Override
public void onBindViewHolder(FootballNewsRowHolder holder, int position) {
final FootballNewsObject listItems = footballNewsObjectList.get(position);
holder.itemView.setSelected(focused==position);
holder.getLayoutPosition();
mImageLoader = AppController.getInstance().getImageLoader();
holder.thumbnail.setImageUrl(listItems.getImage(),mImageLoader);
holder.thumbnail.setDefaultImageResId(R.drawable.reddit_placeholder);
holder.name.setText(Html.fromHtml(listItems.getTitle()));
holder.relativeLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String title = listItems.getTitle();
String article = listItems.getArticle();
String image = listItems.getImage();
Intent i = new Intent(mContext, Extras.class);
i.putExtra("title",title);
i.putExtra("article",article);
i.putExtra("image",image);
mContext.startActivity(i);
//Toast.makeText(mContext,"You clicked",Toast.LENGTH_SHORT).show();
//Intent intent = new Intent(mContext,WebActivity.class);
//intent.putExtra("url",postUrl);
// mContext.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return (null != footballNewsObjectList?footballNewsObjectList.size() :0 );
}
}
Any ideas?
Thanks

You are adding to your list in your refresh method, instead of updating. Add
listItemsList.clear();
at the beginning of your refresh function (updateList).

Related

RecyclerView - No adapter attached; skipping layout

I know this question has already been posted but i tried all solutions and the error still exists.when i call fragment which is loading some data from json and set it in recyclerview, with Debug app i get this error
RecyclerView: No adapter attached; skipping layout
Fragement :
public class Artists extends Fragment {
String URL_DATA = JsonData.FirebaseList;
RecyclerView.LayoutManager layoutManager;
ProgressBar pb;
private List<Post_Artist> post_artists;
private RecyclerView recyclerView;
private TextView loading;
private AdapterFor_Artists adapter;
private AdView mAdView;
public Artists() {
// Required empty public constructor
}
#Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_artists, container, false);
post_artists = new ArrayList<>();
recyclerView = v.findViewById(R.id.rc);
layoutManager = new GridLayoutManager(getActivity(),1);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
loading = v.findViewById(R.id.loadingtext);
pb = v.findViewById(R.id.loadingP);
Typeface typeface = Typeface.createFromAsset(getActivity().getAssets(),"ARCADECLASSIC.TTF");
loading.setTypeface(typeface);
if (adapter == null) {
adapter = new AdapterFor_Artists(post_artists, getActivity(), new RecyclerViewClickListenner_ForArtist() {
#Override
public void onClick(View view, Post_Artist post_artist) {
Intent intent = new Intent(getActivity(), ArtistsPage.class);
intent.putExtra("json_url", post_artist.getJsonUrl());
intent.putExtra("name", post_artist.getArtistName());
startActivity(intent);
getActivity().overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}
});
recyclerView.setAdapter(adapter);
checkInternet();
return v;
}
private boolean checkInternet() {
if (!isNetworkConnected()) {
showDialog();
return false;
} else {
refreshContent();
}
return true;
}
public boolean isNetworkConnected() {
ConnectivityManager connectionManager = (ConnectivityManager) getActivity().getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectionManager == null) {
return false;
}
NetworkInfo networkInfo = connectionManager.getActiveNetworkInfo();
return networkInfo != null && networkInfo.isConnected();
}
private void refreshContent() {
fetchRemoteData(new DataStatus_For_ArtistsList() {
#Override
public void onSuccess(List<Post_Artist> post_artists) {
loading.setVisibility(View.GONE);
pb.setVisibility(View.GONE);
adapter.getItems().clear();
adapter.getItems().addAll(post_artists);
adapter.notifyDataSetChanged();
}
#Override
public void onError(Exception e) {
msgError();
}
});
}
}
private void fetchRemoteData(final DataStatus_For_ArtistsList callback) {
StringRequest stringRequest = new StringRequest(Request.Method.GET,
URL_DATA,
new Response.Listener<String>() {
#Override
public void onResponse(String s) {
List<Post_Artist> listItems = new ArrayList<>();
try {
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("bgs");
for (int i = 0; i < array.length(); i++) {
JSONObject o = array.getJSONObject(i);
Post_Artist item = new Post_Artist(
o.optString("json_url"),
o.optString("name"),
o.optString("cover")
);
listItems.add(item);
}
callback.onSuccess(listItems);
} catch (JSONException e) {
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
callback.onError(error);
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
requestQueue.add(stringRequest);
}

You have to set the adapter with your post_artists list in the onCreateView().your adapter is null that's why you have this error.

Getting same item position in RecyclerView, when click on back button

I have implemented one app where I am using RecyclerView in fragments. There are 3 buttons, 1 image and some text on every item. If I scroll and click on "View Profile" button then new activity will open which is running successfully but when I call back button then the Item is coming on start position. I need item will come at the same position.
Item Image
Code for Fragment
public class Broader_Match_Tab extends Fragment{
int lastVisibleItemPosition;
SessionManager session;
private List<SuperHero> listSuperHeroes;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
public ProgressBar progressBar;
private RequestQueue requestQueue;
private int requestCount1 = 1;
private Boolean isStarted = false;
private Boolean isVisible = false;
boolean isLastPageLoaded = false;
public String email;
TextView tvMSG;
public Broader_Match_Tab() {}
#Override
public void onStart() {
super.onStart();
isStarted = true;
if (isVisible && isStarted){
getData();
}
}
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
isVisible = isVisibleToUser;
if (isStarted && isVisible && (! isLastPageLoaded)) { getData(); } }
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.activity_main_test, container, false);
session = new SessionManager(getActivity());
// get user data from session
HashMap<String, String> user = session.getUserDetails();
email = user.get(SessionManager.KEY_EMAIL);
return view;
}
public void onViewCreated(View v, Bundle savedInstanceState) {
super.onViewCreated(v, savedInstanceState);
recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
listSuperHeroes = new ArrayList<>();
requestQueue = Volley.newRequestQueue(getContext());
adapter = new CardAdapter(listSuperHeroes, getActivity());
recyclerView.setAdapter(adapter);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar1);
tvMSG = (TextView)v.findViewById(R.id.tvMSG);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int
newState) {
super.onScrollStateChanged(recyclerView, newState);
if (isLastItemDisplaying(recyclerView)) {
getData();
}
}
});
}
private JsonArrayRequest getDataFromServer(int requestCount) {
final String DATA_URL = "https://www.example.com";
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response.length() == 0) {
progressBar.setVisibility(View.GONE);
tvMSG.setText("There is no broader matches");
isLastPageLoaded = true;
}
else {
parseData(response);
tvMSG.setVisibility(View.GONE);
progressBar.setVisibility(View.GONE);
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
Toast.makeText(getActivity(), "No More Items Available", Toast.LENGTH_SHORT).show();
}
});
return jsonArrayRequest;
}
private void getData() {
if(!isLastPageLoaded){
requestQueue.add(getDataFromServer(requestCount1));
requestCount1++;
}}
private void parseData(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
SuperHero superHero = new SuperHero();
JSONObject json = null;
try {
json = array.getJSONObject(i);
superHero.setImageUrl(json.getString(Config_Test.TAG_IMAGE_URL));
superHero.setMglId(json.getString(Config_Test.TAG_MGLID));
superHero.setAge(json.getString(Config_Test.TAG_AGE));
superHero.setAgeHeight(json.getString(Config_Test.TAG_AGEHEIGHT));
superHero.setCommunity(json.getString(Config_Test.TAG_COMMUNITY));
superHero.setCaste(json.getString(Config_Test.TAG_CASTE));
superHero.setOccupation(json.getString(Config_Test.TAG_OCCUPATION));
superHero.setIncome(json.getString(Config_Test.TAG_INCOME));
superHero.setShortlist(json.getString(Config_Test.TAG_SHORTLIST));
superHero.setExpress_Intrest(json.getString(Config_Test.TAG_EXPRESSINTREST));
} catch (JSONException e) {
e.printStackTrace();
}
listSuperHeroes.add(superHero);
}
adapter.notifyDataSetChanged();
}
private boolean isLastItemDisplaying(RecyclerView recyclerView) {
if (recyclerView.getAdapter().getItemCount() != 0) {
lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1)
return true;
}
return false;
}
}
Adapter Code
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder>
{
private static final String url ="https://www.example.com";
private static final String url1 = "https://www.example.com";
private static final String KEY_MATRI_ID_TO="matriID_to";
private static final String KEY_MATRI_ID_BY="matriID_by";
SessionManager session;
public String matri_id_to, matri_id_by, str_gender;
String str_shortlist,str_EI;
//Imageloader to load image
private ImageLoader imageLoader;
private Context context;
//List to store all superheroes
List<SuperHero> superHeroes;
//Constructor of this class
public CardAdapter(List<SuperHero> superHeroes, Context context){
super();
//Getting all superheroes
this.superHeroes = superHeroes;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.superheroes_list, parent, false);
// Session class instance
session = new SessionManager(context);
session.checkLogin();
// get user data from session
HashMap<String, String> user = session.getUserDetails();
matri_id_by = user.get(SessionManager.KEY_EMAIL);
str_gender = user.get(SessionManager.KEY_GENDER);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
//Getting the particular item from the list
final SuperHero superHero = superHeroes.get(position);
//Loading image from url
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
if(str_gender.equalsIgnoreCase("Male")) {
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.drawable.image, R.drawable.girl));
}
else {
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.drawable.image, R.drawable.boy));
}
int pos = getItemViewType(position);
if(superHeroes.get(pos).getImageUrl() == null) {
holder.imageView.setVisibility(View.GONE);
} else {
holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
}
holder.textViewId.setText(superHero.getMglId());
holder.AgeHeight.setText(superHero.getAgeHeight()+" / "+superHero.getAge());
holder.Community.setText(superHero.getCommunity()+" / "+superHero.getCaste());
holder.Occupation.setText(superHero.getOccupation());
holder.Income.setText(superHero.getIncome());
str_shortlist = superHero.getShortlist();
if(str_shortlist.toString().equalsIgnoreCase("Shortlisted")) {
holder.btnShortlist.setText(str_shortlist);
holder.btnShortlist.setBackgroundColor(Color.parseColor("#FF0E3671"));
holder.btnShortlist.setEnabled(false);
}
else{
holder.btnShortlist.setEnabled(true);
holder.btnShortlist.setText(str_shortlist);
holder.btnShortlist.setBackgroundColor(Color.parseColor("#2a7fff"));
}
str_EI = superHero.getExpress_Intrest();
Log.e("str_EI_____",str_EI);
if(str_EI.toString().equalsIgnoreCase("Accepted")) {
holder.btnEI.setText(str_EI);
holder.btnEI.setBackgroundColor(Color.parseColor("#FF045B49"));
holder.btnEI.setEnabled(false);
}
else if(str_EI.toString().equalsIgnoreCase("Reject")){
holder.btnEI.setText(str_EI);
holder.btnEI.setBackgroundColor(Color.parseColor("#FF045B49"));
holder.btnEI.setEnabled(false);
}
else if(str_EI.toString().equalsIgnoreCase("Declined")){
holder.btnEI.setText(str_EI);
holder.btnEI.setBackgroundColor(Color.parseColor("#FF045B49"));
holder.btnEI.setEnabled(false);
}
else if(str_EI.toString().equalsIgnoreCase("Pending..")){
holder.btnEI.setText(str_EI);
holder.btnEI.setBackgroundColor(Color.parseColor("#FF045B49"));
holder.btnEI.setEnabled(false);
}
else
{
holder.btnEI.setEnabled(true);
holder.btnEI.setText(str_EI);
holder.btnEI.setBackgroundColor(Color.parseColor("#00aa88"));
}
holder.btnShortlist.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
superHero.setShortlist("Wait...");
holder.btnShortlist.setText(superHero.getShortlist());
matri_id_to = superHero.getMglId();
holder.shortlist(position);
}
});
holder.btnViewProfile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent n = new Intent(holder.itemView.getContext(),BlankActivity.class);
String str_id = holder.textViewId.getText().toString();
n.putExtra("ID",str_id);
holder.itemView.getContext().startActivity(n);
}
});
holder.btnEI.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
superHero.setExpress_Intrest("Wait...");
holder.btnEI.setText(superHero.getExpress_Intrest());
matri_id_to = superHero.getMglId();
holder.expressInterest(position);
}
});
}
public SuperHero getItem(int position){
return superHeroes.get(position);
}
#Override
public int getItemCount() {return superHeroes.size();}
#Override
public int getItemViewType(int position) {
return position;
}
class ViewHolder extends RecyclerView.ViewHolder{
public NetworkImageView imageView;
public TextView textViewId;
public TextView AgeHeight;
public TextView Community;
public TextView Occupation;
public TextView Income;
public Button btnShortlist;
public Button btnViewProfile;
public Button btnEI;
//Initializing Views
public ViewHolder(final View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewId = (TextView) itemView.findViewById(R.id.textViewId);
AgeHeight = (TextView) itemView.findViewById(R.id.AgeHeight);
Community = (TextView) itemView.findViewById(R.id.Community);
Occupation = (TextView) itemView.findViewById(R.id.Occupation);
Income = (TextView) itemView.findViewById(R.id.Income);
btnShortlist = (Button) itemView.findViewById(R.id.btnshort);
btnViewProfile = (Button) itemView.findViewById(R.id.buttonViewProfile);
btnEI = (Button) itemView.findViewById(R.id.btnExpressIntrest);
}
public void shortlist(final int position) {
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if (response.trim().equalsIgnoreCase("success")) {
superHeroes.get(position).setShortlist("Shortlisted");
// holder.btnShortlist.setText(superHero.getShortlist());
notifyDataSetChanged();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(KEY_MATRI_ID_BY, matri_id_by);
params.put(KEY_MATRI_ID_TO, matri_id_to);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(context);
requestQueue.add(stringRequest);
}
public void expressInterest(final int position) {
StringRequest stringRequest1 = new StringRequest(Request.Method.POST, url1, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if(response.trim().equalsIgnoreCase("success")) {
superHeroes.get(position).setExpress_Intrest("Pending..");
notifyDataSetChanged();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context, error.toString(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(KEY_MATRI_ID_BY,matri_id_by);
params.put(KEY_MATRI_ID_TO,matri_id_to);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(context);
requestQueue.add(stringRequest1);
}
}
}

Save Instance Code:
Parcelable mListState;
protected void onSaveInstanceState(Bundle state) {
super.onSaveInstanceState(state);
// Save list state
mListState = mLayoutManager.onSaveInstanceState();
state.putParcelable(LIST_STATE_KEY, mListState);
}
Restore State Code:
protected void onRestoreInstanceState(Bundle state) {
super.onRestoreInstanceState(state);
// Retrieve list state and list/item positions
if(state != null)
mListState = state.getParcelable(LIST_STATE_KEY);
}
Here in onResume() update the layout manager:
#Override
protected void onResume() {
super.onResume();
if (mListState != null) {
mLayoutManager.onRestoreInstanceState(mListState);
}
}
Hope this helps

The main problem is that onPause you are clearing the whole data and when the fragment getting visible again you are requesting to server from the page 1. Comment the following code.
#Override
public void onPause(){
super.onPause();
//listSuperHeroes.clear();
//adapter.notifyDataSetChanged();
//requestCount1=1;
}
}
update the isLastPageLoaded here:
private boolean isLastPageUpdated = false;
private JsonArrayRequest getDataFromServer(int requestCount) {
final String DATA_URL = "https://www.XYZ.php?matri_id="+email+"&page=";
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response.length() == 0) {
progressBar.setVisibility(View.GONE);
tvMSG.setText("There is no broader matches");
isLastPageLoaded = true;
}
else {
parseData(response);
tvMSG.setVisibility(View.GONE);
progressBar.setVisibility(View.GONE);
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
Toast.makeText(getActivity(), "No More Items
Available", Toast.LENGTH_SHORT).show();
}
});
return jsonArrayRequest;
}
and in getData()
private void getData() {
if(!isLastPageUpdated){
requestQueue.add(getDataFromServer(requestCount1));
requestCount1++;
}}

save the position of adapter in some variable in adapter. change scroll to that position on back pressed using
linearLayoutManager.scrollToPositionWithOffset(int, int);
inside activity.

You need to override onBackPressed() and add recyclerView.scrollToPosition(position);
#Override
public void onBackPressed() {
super.onBackPressed();
recyclerView.scrollToPosition(position);
finish();
}

save the position of item clicked in onSaveInstanceState and pass that to scrollToPosition or
try below
private static final String SELECTED_KEY = "selected_position";
#Override
public void onSaveInstanceState(Bundle outState) {
lastFirstVisiblePosition = ((LinearLayoutManager)mRecylerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition();
outState.putInt(SELECTED_KEY, lastFirstVisiblePosition);
}
in Oncreate
Edited..
if(savedInstanceState != null && savedInstanceState.containsKey(SELECTED_KEY))
{
lastFirstVisiblePosition = savedInstanceState.getInt(SELECTED_KEY);
}
use
((LinearLayoutManager) mRecylerView.getLayoutManager()).scrollToPosition(lastFirstVisiblePosition) or
mRecylerView.smoothScrollToPosition(lastFirstVisiblePosition);
after data is populated, preferably after adapter.notifyDataSetChanged();

I was experiencing the same issue before, then I solved my problem with a simpler solution. I just called adapter.startListening(); in onViewCreated() instead of onStart and called adapter.stopListening(); in onDestroyView() instead of onStop().
That prevented the entire list from regenerating while coming back from next activity and thus retained the scroll position where it was previously.

I've solved the problem as follow:
Called .startListening in both onViewCreated and in onStart
Called .stopListening in onDestroyView
Don't call .stopListening in onStop
My code in the fragment as follow:
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle
savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
if (mAdapterHb != null) {
mAdapterHb.startListening();
}
}
#Override
public void onStart() {
super.onStart();
if (mAdapterHb != null) {
mAdapterHb.startListening();
}
}
#Override
public void onStop() {
super.onStop();
// if (mAdapterHb != null) {
// mAdapterHb.stopListening();
// }
}
#Override
public void onDestroyView() {
super.onDestroyView();
if (mAdapterHb != null) {
mAdapterHb.stopListening();
}
}

How to hide items from recyclerview as I search in a List<>

I am using a recyclerView to show a grid of movie posters. The posters are contained in a List<> along with their respective title and so on.
I implemented a searchView widget and I can successuflly get a List of matching results. But I can't hide the other ones.
As you understand I don't want to delete the irrelevant movies from the adapter or the user would not be able to see them again.
This is the code:
public class SearchUtils {
public static List<String> search(List<Show> list, String keyword){
List<String> results = new ArrayList<>();
for (Show curVal : list){
String curTitle = curVal.getTitle().toLowerCase().trim();
if (curTitle.contains(keyword)){
results.add(curTitle);
}else{
results = new ArrayList<>();
}
}
return results;
}
}
ListFragment.java
public class ListFragment extends Fragment implements LoaderManager.LoaderCallbacks<List<Show>> {
private static final String LOG_TAG = "ListFragment";
private static final String ARG_SCOPE = "com.dcs.shows.activity_to_launch";
private static final String BASE_URL = "http://api.themoviedb.org/3";
private TextView tv;
private ProgressBar pb;
private int scope;
private RecyclerView mRecyclerView;
private ShowAdapter mShowAdapter;
private SearchView mSearchView;
public static ListFragment newInstance(int target) {
Bundle args = new Bundle();
args.putInt(ARG_SCOPE, target);
ListFragment fragment = new ListFragment();
fragment.setArguments(args);
return fragment;
}
public ListFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
scope = getArguments().getInt(ARG_SCOPE);
setHasOptionsMenu(true);
Log.i(LOG_TAG, "onCreate#Scope is: " + scope);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_list, container, false);
mShowAdapter = new ShowAdapter(new ArrayList<Show>());
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
GridLayoutManager glm = new GridLayoutManager(getActivity(), 4);
mRecyclerView.setLayoutManager(glm);
mRecyclerView.addItemDecoration(new SpacesItemDecoration(8, getActivity()));
mRecyclerView.setAdapter(mShowAdapter);
mRecyclerView.addOnScrollListener(new EndlessRecyclerViewScrollListener(glm) {
#Override
public void onLoadMore(int page, int totalItemsCount) {
// Triggered only when new data needs to be appended to the list
// Add whatever code is needed to append new items to the bottom of the list
}
});
pb = (ProgressBar)rootView.findViewById(R.id.progress_view);
ConnectivityManager connMgr = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
// fetch data
getLoaderManager().initLoader(1, null, this);
} else {
// display error
pb.setVisibility(View.GONE);
}
return rootView;
}
List<Show> searchList;
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
getActivity().getMenuInflater().inflate(R.menu.main, menu);
final MenuItem myActionMenuItem = menu.findItem( R.id.action_search);
mSearchView = (SearchView) myActionMenuItem.getActionView();
mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String s) {
if(!mSearchView.isIconified()) {
mSearchView.setIconified(true);
}
myActionMenuItem.collapseActionView();
return false;
}
#Override
public boolean onQueryTextChange(String s) {
if(s != null || !s.isEmpty()) {
for(Show movie : mShowAdapter.getList()) {
if(movie.getTitle().toLowerCase().contains(s.toLowerCase())){
mShowAdapter.add(movie);
}
mShowAdapter.notifyDataSetChanged();
}
} else {
mShowAdapter.addItemsToList(searchList, false);
}
return false;
}
});
mSearchView.addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {
#Override
public void onViewDetachedFromWindow(View arg0) {
// search was detached/closed
Log.v(LOG_TAG, "Restoring list: " + searchList + " size: " + searchList.size());
mShowAdapter.addItemsToList(searchList, false);
}
#Override
public void onViewAttachedToWindow(View arg0) {
// search was opened
searchList = mShowAdapter.getList();
}
});
}
private class ShowHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextView;
public ShowHolder(View itemView) {
super(itemView);
mImageView = (ImageView) itemView.findViewById(R.id.grid_item_image);
mTextView = (TextView) itemView.findViewById(R.id.grid_item_title);
}
}
private class ShowAdapter extends RecyclerView.Adapter<ShowHolder> {
private List<Show> mShows;
public ShowAdapter(List<Show> shows) {
mShows = shows;
}
public void add(Show show){
mShows.add(show);
notifyDataSetChanged();
}
public void addItemsToList(List<Show> newShows, boolean append){
if(append){
mShows.addAll(newShows);
}else {
mShows = newShows;
}
notifyDataSetChanged();
}
public void removeItemsFromList(int index){
mShows.remove(index);
notifyItemRemoved(index);
}
public List<Show> getList(){
return mShows;
}
#Override
public ShowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(getActivity());
View rootView = inflater.inflate(R.layout.list_item_row, parent, false);
return new ShowHolder(rootView);
}
#Override
public void onBindViewHolder(ShowHolder holder, int position) {
Show currentShow = mShows.get(position);
holder.mTextView.setText(currentShow.getTitle());
Glide.with(getActivity()).load(currentShow.getImage()).into(holder.mImageView);
}
#Override
public int getItemCount() {
return mShows.size();
}
}
#Override
public Loader<List<Show>> onCreateLoader(int i, Bundle bundle) {
//start the loader with the appropriate uri
//for now it only supports movies+popular
//it will support movies+top, tv+popular, tv+top.
Uri baseUri = Uri.parse(BASE_URL);
Uri.Builder uriBuilder = baseUri.buildUpon();
uriBuilder.appendPath("movie");
uriBuilder.appendPath("popular");
uriBuilder.appendQueryParameter("api_key", QueryUtils.API_KEY);
uriBuilder.appendQueryParameter("page", Integer.valueOf(1).toString());
Log.v(LOG_TAG, "onCreateLoader#URL built: " + uriBuilder.toString());
return new ShowLoader(getActivity(), uriBuilder.toString());
}
#Override
public void onLoadFinished(Loader<List<Show>> loader, List<Show> shows) {
// Clear the adapter of previous earthquake data
clearAdapter();
// If there is a valid list of Shows, then add them to the adapter's
// data set. This will trigger the ListView to update.
if (shows != null && !shows.isEmpty()) {
mShowAdapter.addItemsToList(shows, false);
mShowAdapter.notifyDataSetChanged();
}
pb.setVisibility(View.GONE);
}
#Override
public void onLoaderReset(Loader<List<Show>> loader) {
// Loader reset, so we can clear out our existing data.
clearAdapter();
}
private void clearAdapter(){
List<Show> empty = new ArrayList<>();
mShowAdapter.addItemsToList(empty, false);
mShowAdapter.notifyDataSetChanged();
}
Thanks

You can use two lists, one with all the elements (original), and one with just queried elements (this one should use recyclerview adapter). When querying, just select from original list and add them to adapter list, then notify changes. Don't forget to clear adapter list before adding new entries.
Edit: you can try something like this on onQueryTextChange method. Adapt for your own wish.
if(s != null && !s.isEmpty()) {
for(String movie : originalList) {
if(movie.toLowerCase().contains(s.toLowerCase()){
adapter.add(movie);
}
notifyChanges();
}
}
} else { adapter.addAll(originalList); }

RecyclerView during OnRefresh adds another recyclerView List?

when I conduct onRefresh, my recyclerView adds on another copy to my current recyclerView instead of refreshing it, by looking at my code below does anyone know what the problem is?I have tried everything but nothing seems to work?
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
//send our volley JSON Request
//Initialize VolleySingleton
mVolleySingleton = VolleySingleton.getInstance();
//intitalize Volley Singleton request key
mRequestQueue = mVolleySingleton.getRequestQueue();
//2 types of requests an Array request and an Object Request
JSONArrayRequest();
}
private void JSONArrayRequest() {
JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, URL_API, (String) null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
listblogs=parseJSONResponse(response);
mAdapterDashBoard.setBloglist(listblogs);
System.out.println("it worked!!!");
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
ToastTest.t(getActivity(), error.toString());
}
});
mRequestQueue.add(request);
}
private ArrayList<Blogs> parseJSONResponse(JSONArray response) {
if (!response.equals("")) {
ArrayList<Blogs> blogsArrayList = new ArrayList<>();
try {
StringBuilder data = new StringBuilder();
for (int i = 0; i < response.length(); i++) {
JSONObject currentQuestions = response.getJSONObject(i);
String text = currentQuestions.getString("text");
String points = currentQuestions.getString("points");
String ID=currentQuestions.getString("id");
String courseId = currentQuestions.getString("courseId");
String studentId = currentQuestions.getString("studentId");
data.append(text + "\n" + points + "\n" + courseId + "\n");
System.out.println(data);
Blogs blogs = new Blogs();
blogs.setId(ID);
blogs.setMstudentId(studentId);
blogs.setMtext(text);
blogs.setPoints(points);
listblogs.add(blogs);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return listblogs;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view=inflater.inflate(R.layout.fragment_dashboard,container,false);
mRecyclerView=(RecyclerView)view.findViewById(R.id.fragment_dashboard);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mAdapterDashBoard=new AdapterDashBoard(getActivity());
mRecyclerView.setAdapter(mAdapterDashBoard);
mPullToRefreshView = (PullToRefreshView)view.findViewById(R.id.pull_to_refresh);
mPullToRefreshView.setOnRefreshListener(new PullToRefreshView.OnRefreshListener() {
#Override
public void onRefresh() {
mPullToRefreshView.postDelayed(new Runnable() {
#Override
public void run() {
mPullToRefreshView.setRefreshing(false);
JSONArrayRequest();
}
}, REFRESH_DELAY);
}
});
return view;
}
}
public class AdapterDashBoard extends RecyclerView.Adapter<AdapterDashBoard.ViewDashboard>{
private LayoutInflater mLayoutInflater;
private ArrayList<Blogs> listblogs=new ArrayList<>();
public AdapterDashBoard(Context context){
mLayoutInflater=LayoutInflater.from(context);
}
public void setBloglist(ArrayList<Blogs> listBlogs){
this.listblogs=listBlogs;
notifyItemRangeChanged(0,listBlogs.size());
}
#Override
public ViewDashboard onCreateViewHolder(ViewGroup parent, int viewType) {
View view= mLayoutInflater.inflate(R.layout.customizejson,parent,false);
ViewDashboard viewholder=new ViewDashboard(view);
return viewholder;
}
#Override
public void onBindViewHolder(ViewDashboard holder, int position) {
Blogs currentBlog=listblogs.get(position);
holder.questionText.setText(currentBlog.getMtext().toString());
holder.points.setText(currentBlog.getPoints().toString());
holder.id.setText(currentBlog.getId().toString());
}
#Override
public int getItemCount() {
return listblogs.size();
}
static class ViewDashboard extends RecyclerView.ViewHolder{
private ImageView thumbnail;
private TextView questionText;
private TextView points;
private TextView id;
public ViewDashboard (View itemView){
super(itemView);
//thumbnail=(ImageView)itemView.findViewById(R.id.thumbnail);
questionText=(TextView)itemView.findViewById(R.id.questionText);
points=(TextView)itemView.findViewById(R.id.points);
id=(TextView)itemView.findViewById(R.id.ID);
}
}
}

You need to clear your listblogs list before adding new items. This is why you get duplicated values.
Also you're already adding new items to listblogs in parseJSONResponse() method, so there is no need for listblogs=parseJSONResponse(response); in onResponse() method, while its the same list.
Change your onResponse() method to:
#Override
public void onResponse(JSONArray response) {
listblogs.clear(); // here you clear the old data
parseJSONResponse(response);
mAdapterDashBoard.setBloglist(listblogs);
System.out.println("it worked!!!");
}

fragment is not updating after i checked the button in the base adapter

hi friends i am new to the android development i am developing an app similar to flipkart. i am using the tab layout where there are 4tabs 1.home 2.menu 3.cart 4.settings
Each tab consists of list view where each one is having fragment in it,when i click the menu button and select an item that i want to order,after ordering it, it is not loading in the cart so i am not able to locate the item in the cart
MenuAdapter.Java
public class Second_adapter extends BaseAdapter {
Context context;
TextView basename, SubItemprice, itemdesc, SubItemdesc;
LayoutInflater inflater;
ImageView order;
private List<JSONParser> items;
String itembasename, itemde, subtmsub, subitempri;
SharedPreferences.Editor loginPrefsEditor;
public Second_adapter(Context context, List<JSONParser> items) {
this.context = context;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int i) {
return items.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (view == null)
view = inflater.inflate(R.layout.item_clicked, viewGroup, false);
basename = (TextView) view.findViewById(R.id.basename);
SubItemprice = (TextView) view.findViewById(R.id.SubItemprice);
itemdesc = (TextView) view.findViewById(R.id.itemdesc);
SubItemdesc = (TextView) view.findViewById(R.id.SubItemdesc);
order = (ImageView) view.findViewById(R.id.order);
final JSONParser setdata = items.get(i);
basename.setText(setdata.getBaseName());
itemdesc.setText(setdata.getItemdesc());
SubItemdesc.setText(setdata.getSubItemdesc());
SubItemprice.setText(setdata.getSubItemprice());
order.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
itembasename = setdata.getBaseName();
itemde = setdata.getItemdesc();
subtmsub = setdata.getSubItemdesc();
subitempri = setdata.getSubItemprice();
Session userloggedin=new Session(context);
if (userloggedin.isLoggedIn()){
addcart();
Cart cart=new Cart();
cart.cartdata();
Toast.makeText(context, "LoggedIn" +itembasename+itemde+subtmsub+subitempri, Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(context,"Please Login", Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
private void addcart() {
SharedPreferences customerid=context.getSharedPreferences("loginPrefs",Context.MODE_PRIVATE);
String customid=customerid.getString("customerid","");
String addcarturl = "http://standardtakeaway.co.uk/json/cart_process.php?userid="+customid+"&Item="+itembasename+itemde+subtmsub+"&Itemcount=1&price="+subitempri;
Log.d("Cart",addcarturl);
JsonArrayRequest cartreq=new JsonArrayRequest(Request.Method.POST, addcarturl, (String) null, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
for (int i=0;i<response.length();i++){
try {
JSONObject cartobj=response.getJSONObject(i);
String count=cartobj.getString("count");
loginPrefsEditor.putString("Badge",count);
loginPrefsEditor.commit();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context,""+error, Toast.LENGTH_SHORT).show();
}
});
AppController.getInstance().addToRequestQueue(cartreq);
}
}
Cart.Class
public class Cart extends Fragment {
Button check_out;
TextView subtotal;
ListView cartview;
CartAdapter cartAdapter;
List<JSONParser> cartitems;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View cartfrag = inflater.inflate(R.layout.cart, container, false);
subtotal = (TextView) cartfrag.findViewById(R.id.subtotal);
cartview = (ListView) cartfrag.findViewById(R.id.cartview);
cartitems = new ArrayList<JSONParser>();
cartAdapter = new CartAdapter(getActivity(), cartitems);
cartview.setAdapter(cartAdapter);
check_out = (Button) cartfrag.findViewById(R.id.check_out);
check_out.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent cart_check = new Intent(getActivity(), Check.class);
startActivity(cart_check);
}
});
Session cartlogged=new Session(getActivity());
if (cartlogged.isLoggedIn()){
cartdata();
}else {
Toast.makeText(getActivity(),"Not Logged", Toast.LENGTH_SHORT).show();
}
cartdata();
return cartfrag;
}
void cartdata() {
SharedPreferences customerid=getActivity().getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
String customid=customerid.getString("customerid","");
String carturl = "http://standardtakeaway.co.uk/json/view_cart.php?userid=" + customid;
Log.d("CartData", carturl);
JsonObjectRequest cartreq = new JsonObjectRequest(Request.Method.GET, carturl, (String) null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray objarray = response.getJSONArray("items");
for (int i = 0; i < objarray.length(); i++) {
JSONObject cartdataobj = objarray.getJSONObject(i);
JSONParser parserdata = new JSONParser();
parserdata.setCartquantity(cartdataobj.getString("qty"));
parserdata.setCartbase(cartdataobj.getString("BaseName"));
parserdata.setCartprice(cartdataobj.getString("price"));
cartitems.add(parserdata);
}
JSONObject subobj=response.getJSONObject("details");
String subtext=subobj.getString("subtotal");
subtotal.setText(subtext);
} catch (JSONException e) {
e.printStackTrace();
}
cartAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getActivity(), "" + error, Toast.LENGTH_SHORT).show();
}
});
cartreq.setRetryPolicy(new DefaultRetryPolicy(6000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(cartreq);
}
public static Cart getInstance(String message) {
Cart cart = new Cart();
Bundle bundle = new Bundle();
bundle.putString("MSG", message);
cart.setArguments(bundle);
return cart;
}
TabLayout.java
public class TabAdapter extends FragmentStatePagerAdapter {
private Context mContext;
private List<Fragment> mFragments = new ArrayList<>();
private List<String> mFragmentTitles = new ArrayList<>();
private List<Integer> mFragmentIcons = new ArrayList<>();
public TabAdapter(Context context, FragmentManager fm) {
super(fm);
this.mContext = context;
}
public void addFragment(Fragment fragment, String title, int drawable) {
mFragments.add(fragment);
mFragmentTitles.add(title);
mFragmentIcons.add(drawable);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
public View getTabView(int position) {
View tab = LayoutInflater.from(mContext).inflate(R.layout.customtab, null);
TextView tabText = (TextView) tab.findViewById(R.id.tabText);
ImageView tabImage = (ImageView) tab.findViewById(R.id.tabImage);
tabText.setText(mFragmentTitles.get(position));
tabImage.setBackgroundResource(mFragmentIcons.get(position));
if (position == 0) {
tab.setSelected(true);
}
return tab;
}
}
MainActivity.java
public class MainActivity extends BaseActivity implements OnFragmentInteractionListener {
#Bind(R.id.tabpager)
ViewPager mViewpager;
#Bind(R.id.tab_layout)
TabLayout mTabs;
private TabAdapter pageAdapter;
String home,menu,cart,account,more;
#Override
protected int getLayoutResource() {
return R.layout.activity_main;
}
#Override
protected void initVariables(Bundle savedInstanceState) {
home= getString(R.string.home);
menu = getString(R.string.menu);
cart = getString(R.string.cart);
account = getString(R.string.account);
more = getString(R.string.more);
}
#Override
protected void initData(Bundle savedInstanceState) {
setupViewPager(mViewpager);
setupTabLayout(mTabs);
}
public void setupViewPager(ViewPager viewPager) {
pageAdapter = new TabAdapter(getApplicationContext(), getSupportFragmentManager());
pageAdapter.addFragment(MainFragment.getInstance(home), home, R.drawable.home);
pageAdapter.addFragment(MenuItems.getInstance(menu), menu, R.drawable.menu);
pageAdapter.addFragment(Cart.getInstance(cart), cart, R.drawable.cart);
pageAdapter.addFragment(Account.getInstance(account), account, R.drawable.account);
pageAdapter.addFragment(More.getInstance(more), more, R.drawable.more);
viewPager.setAdapter(pageAdapter);
}
public void setupTabLayout(TabLayout tabLayout) {
tabLayout.setTabMode(TabLayout.MODE_FIXED);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setupWithViewPager(mViewpager);
mViewpager.setOffscreenPageLimit(4);
for (int i = 0; i < tabLayout.getTabCount(); i++) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(pageAdapter.getTabView(i));
}
tabLayout.requestFocus();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

You can fix this way by setting setOnPageChangeListener on viewPager:
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int index) {
// TODO Auto-generated method stub
if(index==3){
((Cart) mAdapter.getItem(index)).cartdata();
}
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
Your cartdata() must be public.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Updating data in a recyclerview - android

You are adding to your list in your refresh method, instead of updating. Add listItemsList.clear(); at the beginning of your refresh function (updateList).

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Getting same item position in RecyclerView, when click on back button

How to hide items from recyclerview as I search in a List<>

RecyclerView during OnRefresh adds another recyclerView List?

fragment is not updating after i checked the button in the base adapter

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