Set notifyDataSetChanged() on Recyclerview adapter
you are setting the new list to the RecyclerView Adapter , set the list in the Adapter:
make a method setItems(list)
in adapter and call it before notifyDataSetChanged()
and in adapter do
this.persons = new ArrayList<>(persons);
in setItems
add this method in adapter:
public void setItems(List<ServiceModel> persons) {
this.persons = persons;
}
and call it before notifyDataSetChanged()
like this:
adapter.setItems(list);
adapter.notifyDataSetChanged();
Menu
Updated on February 18, 2020Comments
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Menu over 4 years
I'm implementing an endless data loading for a RecyclerView. When software detects that last item is going to be shown, it downloads new items and call to the
loadMoreData()
function but new dataset is not showing.When I called
notifyDataSetChanged()
so nothing to be happened.I have only one solution that is refresh the view is to set again the adapter but problem is that the recyclerview returns to the first position then again recyclerview scrolled up from the first position to last position.
RecyclerViewActivity.java
RecyclerView rv; DatabaseHelpr databaseHelpr; RVAdapter adapter; LocationFinder locationfinder; Location currentLocation; ArrayList<ServiceModel> childList, list; private int MainService_ID, city_id; String url2; ActionBar actionBar; JSONArray items = null; Utility utility; Double lat, longi; LinearLayoutManager llm; int counter=0; ProgressBar progressBar; private static final String TAG_ITEMS = "items"; private static final String TAG_LOCALITY = "Locality"; private static final String TAG_BUSINESS_ID = "Business_Id"; private static final String TAG_LONGITUDE = "Longitude"; private static final String TAG_BUSINESS_NAME = "Business_Name"; private static final String TAG_LATITUDE = "Latitude"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.recyclerview_activity); list = new ArrayList<>(); utility = new Utility(this); llm = new LinearLayoutManager(this); Bundle bundle=getIntent().getExtras(); MainService_ID=bundle.getInt("service_id"); String mainService_Name = bundle.getString("service_name"); city_id = bundle.getInt("city_id"); lat= bundle.getDouble("lat"); longi=bundle.getDouble("longi"); rv=(RecyclerView)findViewById(R.id.rv); rv.setLayoutManager(llm); actionBar = getSupportActionBar(); assert actionBar != null; actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setTitle(mainService_Name); //Here city_id = 8, lat = 18.552954, longi = 73.897200, counter=0, MainService_ID = 5 String url="https://servicedata2-dot-indiacomapi.appspot.com/_ah/api/servicedata/v1/ServiceData?city_id="; url2 =url+city_id+"&lat="+lat+"&lng="+longi+"&roll="+counter+"&service_id="+MainService_ID; AsyncHttpClient client = new AsyncHttpClient(); progressBar=(ProgressBar) findViewById(R.id.progressBar1); progressBar.setVisibility(View.VISIBLE); client.get(url2, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] response) { // called when response HTTP status is "200 OK" String s = new String(response); try { JSONObject jsonObj = new JSONObject(s); // Getting JSON Array node items = jsonObj.getJSONArray(TAG_ITEMS); // looping through All Contacts for (int i = 0; i < items.length(); i++) { JSONObject c = items.getJSONObject(i); String locality = c.getString(TAG_LOCALITY); String business_Id = c.getString(TAG_BUSINESS_ID); String longitude = c.getString(TAG_LONGITUDE); String latitude = c.getString(TAG_LATITUDE); String business_Name = c.getString(TAG_BUSINESS_NAME); locationfinder = new LocationFinder(RecyclerViewActivity.this); // check if GPS enabled if (locationfinder.canGetLocation()) { double lat = locationfinder.getLatitude(); double longi = locationfinder.getLongitude(); currentLocation = new Location(""); currentLocation.setLatitude(lat); currentLocation.setLongitude(longi); } else { locationfinder.showSettingsAlert(); } Location savedLocation = new Location("databaseLocation"); savedLocation.setLatitude(Double.parseDouble(latitude)); savedLocation.setLongitude(Double.parseDouble(longitude)); Double difference = currentLocation.distanceTo(savedLocation) * (0.001); difference = Double.parseDouble(new DecimalFormat("##.##").format(difference)); String newDifference = String.valueOf(difference) + " km"; ServiceModel serviceModel = new ServiceModel(business_Id, business_Name, newDifference, locality); list.add(serviceModel); } } catch (JSONException e) { e.printStackTrace(); } progressBar.setVisibility(View.GONE); adapter = new RVAdapter(RecyclerViewActivity.this, list); rv.setAdapter(adapter); rv.addOnScrollListener(new EndlessRecyclerOnScrollListener(llm) { @Override public void onLoadMore(int current_page) { // counter= counter+1; loadMoreData(); } }); } @Override public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) { // called when response HTTP status is "4XX" (eg. 401, 403, 404) //Toast.makeText(getApplicationContext(),""+statusCode,Toast.LENGTH_LONG).show(); } }); } private void loadMoreData() { counter= counter+1; //Here city_id = 8, lat = 18.552954, longi = 73.897200, counter=1, MainService_ID = 5 String url="https://servicedata2-dot-indiacomapi.appspot.com/_ah/api/servicedata/v1/ServiceData?city_id="; url2 =url+city_id+"&lat="+lat+"&lng="+longi+"&roll="+counter+"&service_id="+MainService_ID; AsyncHttpClient client = new AsyncHttpClient(); progressBar=(ProgressBar) findViewById(R.id.progressBar1); progressBar.setVisibility(View.VISIBLE); client.get(url2, new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] response) { // called when response HTTP status is "200 OK" String s = new String(response); try { JSONObject jsonObj = new JSONObject(s); // Getting JSON Array node items = jsonObj.getJSONArray(TAG_ITEMS); // looping through All Contacts for (int i = 0; i < items.length(); i++) { JSONObject c = items.getJSONObject(i); String locality = c.getString(TAG_LOCALITY); String business_Id = c.getString(TAG_BUSINESS_ID); String longitude = c.getString(TAG_LONGITUDE); String latitude = c.getString(TAG_LATITUDE); String business_Name = c.getString(TAG_BUSINESS_NAME); locationfinder = new LocationFinder(RecyclerViewActivity.this); // check if GPS enabled if (locationfinder.canGetLocation()) { double lat = locationfinder.getLatitude(); double longi = locationfinder.getLongitude(); currentLocation = new Location(""); currentLocation.setLatitude(lat); currentLocation.setLongitude(longi); } else { locationfinder.showSettingsAlert(); } Location savedLocation = new Location("databaseLocation"); savedLocation.setLatitude(Double.parseDouble(latitude)); savedLocation.setLongitude(Double.parseDouble(longitude)); Double difference = currentLocation.distanceTo(savedLocation) * (0.001); difference = Double.parseDouble(new DecimalFormat("##.##").format(difference)); String newDifference = String.valueOf(difference) + " km"; ServiceModel serviceModel = new ServiceModel(business_Id, business_Name, newDifference, locality); list.add(serviceModel); } } catch (JSONException e) { e.printStackTrace(); } progressBar.setVisibility(View.GONE); //adapter = new RVAdapter(RecyclerViewActivity.this, list); //rv.setAdapter(adapter); adapter.notifyDataSetChanged(); } @Override public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) { } }); Toast.makeText(this, "Net is present", Toast.LENGTH_SHORT).show(); } }
RVAdapter.java
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder>{ private final LayoutInflater mInflater; List<ServiceModel> persons ; private Context mContext; public RVAdapter(Context context,List<ServiceModel> persons){ this.mInflater = LayoutInflater.from(context); this.persons = new ArrayList<>(persons); this.mContext = context; } @Override public void onAttachedToRecyclerView(RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); } @Override public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false); PersonViewHolder pvh = new PersonViewHolder(v); return pvh; } @Override public void onBindViewHolder(PersonViewHolder personViewHolder, int i) { ServiceModel person = persons.get(i); personViewHolder.businessName.setOnClickListener(clickListener); personViewHolder.image_url.setOnClickListener(clickListenerImage); personViewHolder.businessName.setTag(personViewHolder); personViewHolder.difference.setTag(personViewHolder); personViewHolder.business_id.setTag(personViewHolder); personViewHolder.image_url.setTag(personViewHolder); personViewHolder.locality.setTag(personViewHolder); personViewHolder.businessName.setText(Html.fromHtml(person.getBusinessname())); String firstLetter = String.valueOf(person.getBusinessname().charAt(0)); ColorGenerators generator = ColorGenerators.MATERIAL; // or use DEFAULT int color = generator.getColor(person.getBusinessname()); TextDrawable drawable = TextDrawable.builder().buildRound(firstLetter, color); // radius in px personViewHolder.image_url.setImageDrawable(drawable); personViewHolder.difference.setText(Html.fromHtml(person.getNewDiffer())); personViewHolder.locality.setText(Html.fromHtml(person.getLocality())); personViewHolder.bind(person); } View.OnClickListener clickListener = new View.OnClickListener() { @Override public void onClick(View view) { PersonViewHolder holder = (PersonViewHolder) view.getTag(); int position = holder.getPosition(); ServiceModel person = persons.get(position); String businessids = person.getBusinessid(); Intent intent = new Intent(mContext, BusinessInfoActivity.class); intent.putExtra("businessids", businessids); mContext.startActivity(intent); } }; View.OnClickListener clickListenerImage = new View.OnClickListener() { @Override public void onClick(View view) { PersonViewHolder holder = (PersonViewHolder) view.getTag(); int position = holder.getPosition(); ServiceModel person = persons.get(position); String businessids = person.getBusinessid(); Intent intent = new Intent(mContext, BusinessInfoActivity.class); intent.putExtra("businessids", businessids); mContext.startActivity(intent); } }; @Override public int getItemCount() { return persons.size(); } public void animateTo(List<ServiceModel> models) { applyAndAnimateRemovals(models); applyAndAnimateAdditions(models); applyAndAnimateMovedItems(models); } private void applyAndAnimateRemovals(List<ServiceModel> newModels) { for (int i = persons.size() - 1; i >= 0; i--) { final ServiceModel model = persons.get(i); if (!newModels.contains(model)) { removeItem(i); } } } private void applyAndAnimateAdditions(List<ServiceModel> newModels) { for (int i = 0, count = newModels.size(); i < count; i++) { final ServiceModel model = newModels.get(i); if (!persons.contains(model)) { addItem(i, model); } } } private void applyAndAnimateMovedItems(List<ServiceModel> newModels) { for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) { final ServiceModel model = newModels.get(toPosition); final int fromPosition = persons.indexOf(model); if (fromPosition >= 0 && fromPosition != toPosition) { moveItem(fromPosition, toPosition); } } } public ServiceModel removeItem(int position) { final ServiceModel model = persons.remove(position); notifyItemRemoved(position); return model; } public void addItem(int position, ServiceModel model) { persons.add(position, model); notifyItemInserted(position); } public void moveItem(int fromPosition, int toPosition) { final ServiceModel model = persons.remove(fromPosition); persons.add(toPosition, model); notifyItemMoved(fromPosition, toPosition); } public static class PersonViewHolder extends RecyclerView.ViewHolder { protected CardView cv; protected TextView businessName, difference, business_id, locality; protected ImageView image_url; public PersonViewHolder(View itemView) { super(itemView); cv = (CardView)itemView.findViewById(R.id.cv); businessName = (TextView)itemView.findViewById(R.id.business_name); difference = (TextView)itemView.findViewById(R.id.txtDifferenece); business_id = (TextView)itemView.findViewById(R.id.business_id); image_url = (ImageView)itemView.findViewById(R.id.thumbnail); locality= (TextView)itemView.findViewById(R.id.txtLocality); } public void bind(ServiceModel model) { businessName.setText(model.getBusinessname()); } } }
Please help me, How to set
notifyDataSetChanged()
to the adapter. it is not working in my code. I already checked all answers which is posted on the stackoverflow. -
Menu over 8 yearsIt is not helpful for me. not showing the next dataset on the recyclerview @kadir altinok
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Menu over 8 yearsI am initialising my adapter only very first time then on loadMoreData() I have only set to adapter.notifyDataSetChanged(). I didn't initialize adapter every time.
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Beena over 8 yearsThere should be something in your code which is reinitialising either your
ArrayList
or Adapter that has stopped notifyDataSetChanged() function. -
Menu over 8 yearsfor notifyItemInserted() what will be the value of int value. it is 0 or 1?? @Ritesh
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Menu over 8 yearsI checked all the code but where is I am wrong? didn't no @ Beena
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Ritt over 8 yearsit's not necessary to be 0 or 1. maintain a variable somewhere, which will have the size of your array, and onInsert, the int value would be the "size+1".
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Ritt over 8 yearsbecause you will inserting the new item at the end of the list.
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Menu over 8 yearsokay but it is not working. I didn't get the result using notifyItemInserted(). @Ritesh
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emir over 7 yearsIt is also good practice to use adapter.notifyItemInserted(mItems.size() - 1); insted of adapter.notifyDataSetChanged();
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JAAD over 7 years@emir here we are replacing the list and not inserting items , you are assuming that the list is empty which is not the case always
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emir over 7 yearsI am doing the same in my project, when I want to replace list I just clear "list" before adding and it is working
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AAA over 4 years@ColdFire can you help with this one please stackoverflow.com/questions/58849910/…
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sanjaykmwt about 4 yearsYou should think before posting an answer