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How to add long click listener on recyclerview adapter?

I already implemented onClick now I want to add onLongClick , I searched non of the solutions matched my case, because my adapter is setup differently
Adapter
public class StudioAdapter extends RecyclerView.Adapter<StudioAdapter.StudioViewHolder> {
public interface OnItemClickListener {
void onItemClick(int item);
}
private List<String> StudioLogoPaths;
private OnItemClickListener listener;
public StudioAdapter(List<String> StudioLogoPaths, OnItemClickListener listener) {
this.StudioLogoPaths = (List<String>) StudioLogoPaths;
this.listener = listener;
}
#Override
public StudioAdapter.StudioViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.studio_logo, parent, false);
StudioViewHolder vh = new StudioViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder( StudioAdapter.StudioViewHolder vh, int position) {
final String path = StudioLogoPaths.get(position);
Glide.with(vh.itemView.getContext()).load(path).into(vh.logoImage);
String basepath = "/data/user/0/org.courville.nova/app_scraper_studiologos/";
String extension = ".png";
final String clicked_studioname = path.replace(basepath, "").replace(extension, "");
final int Position = position;
vh.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
listener.onItemClick(Position);
Toast.makeText(vh.itemView.getContext(), clicked_studioname, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return StudioLogoPaths.size();
}
public class StudioViewHolder extends RecyclerView.ViewHolder {
protected ImageView logoImage;
public StudioViewHolder(View itemView) {
super(itemView);
logoImage = itemView.findViewById(R.id.studio_logo);
}
}
}
my Fragment
StudioAdapter.OnItemClickListener studioLogoCallback = new StudioAdapter.OnItemClickListener() {
#Override
public void onItemClick(int item) {
Glide.with(mContext).clear(mLogo);
Glide.with(mContext).load(tags.getStudioLogosLargeFileF().get(item))
.fitCenter().into(mLogo);
List<ScraperImage> scraperImage = tags.getStudioLogos();
ScraperImage clickedImage = (ScraperImage) scraperImage.get(item);
new VideoInfoActivityFragment.ClearLogoSaver(mContext, new VideoInfoActivityFragment()).execute(clickedImage);
}
};
final StudioAdapter studioAdapter = new StudioAdapter(StudioLogoPaths,studioLogoCallback);
studios.setAdapter(studioAdapter);

You need to add a 2nd method to your interface to represent the long click event. Then, within onBindViewHolder, add vh.itemView.setOnLongClickListener(...) in which you call that 2nd method.
Edit:
Your interface should now look like this:
public interface OnItemClickListener {
void onItemClick(int item);
void onItemLongClick(int item);
}

I solved it like this:
Adapter
public class StudioAdapter extends RecyclerView.Adapter<StudioAdapter.StudioViewHolder> {
public interface OnItemClickListener {
void onItemClick(int item);
void onItemLongClick(int position);
}
private List<String> StudioLogoPaths;
private OnItemClickListener listener;
public StudioAdapter(List<String> StudioLogoPaths, OnItemClickListener listener) {
this.StudioLogoPaths = (List<String>) StudioLogoPaths;
this.listener = listener;
}
#Override
public StudioAdapter.StudioViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.studio_logo, parent, false);
StudioViewHolder vh = new StudioViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder( StudioAdapter.StudioViewHolder vh, int position) {
final String path = StudioLogoPaths.get(position);
Glide.with(vh.itemView.getContext()).load(path).into(vh.logoImage);
String basepath = "/data/user/0/org.courville.nova/app_scraper_studiologos/";
String extension = ".png";
final String clicked_studioname = path.replace(basepath, "").replace(extension, "");
final int Position = position;
vh.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
listener.onItemClick(Position);
Toast.makeText(vh.itemView.getContext(), clicked_studioname, Toast.LENGTH_SHORT).show();
}
});
vh.itemView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
listener.onItemLongClick(Position);
return false;
}
});
}
#Override
public int getItemCount() {
return StudioLogoPaths.size();
}
public class StudioViewHolder extends RecyclerView.ViewHolder {
protected ImageView logoImage;
public StudioViewHolder(View itemView) {
super(itemView);
logoImage = itemView.findViewById(R.id.studio_logo);
}
}
}
Fragment
StudioAdapter.OnItemClickListener studioLogoCallback = new StudioAdapter.OnItemClickListener() {
#Override
public void onItemClick(int item) {
}
#Override
public void onItemLongClick(int position) {
Glide.with(mContext).clear(mLogo);
Glide.with(mContext).load(tags.getStudioLogosLargeFileF().get(position))
.fitCenter().into(mLogo);
ScraperImage clickedImage = (ScraperImage) scraperImage.get(position);
new VideoInfoActivityFragment.ClearLogoSaver(mContext, new VideoInfoActivityFragment()).execute(clickedImage);
}
};

I'd like to implement a recycler view click event

I want to implement a recycler view click event. I intended to have an event when I clicked tvRoomNum. But error 'TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference' occurs. So I notice that tvRoomNum is null object and attempt to use 'findViewById'. But the function is not recognized. How can I solve the problem?
public class RoomAdapter extends RecyclerView.Adapter<RoomAdapter.CustomViewHolder> {
private Context context;
private ArrayList<RoomData> rooms;
public ArrayList<StudnetInRoomData> students;
private LayoutInflater inflater;
private RoomData room;
View view;
public RoomAdapter(Context context, ArrayList<RoomData> rooms) {
this.context = context;
this.rooms = rooms;
this.inflater = LayoutInflater.from(context);
students = new ArrayList<>();
}
#Override
public CustomViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
view = inflater.inflate(R.layout.single_room, parent, false);
return new CustomViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull CustomViewHolder holder, int position) {
room = rooms.get(position);
holder.tvRoomNum.setText(String.valueOf(room.roomNum));
}
#Override
public int getItemCount() {
return rooms.size();
}
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView tvRoomNum;
public CustomViewHolder(View itemView) {
super(itemView);
tvRoomNum.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(), PlusStudentActivity.class);
intent.putExtra("studentList", room.students);
context.startActivity(intent);
}
});
}
}
}
The code below is the adapter of the recycler view that implements the recycler view. This is a dual recircular view structure.
public class FloorAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements OnFloorItemClickListener {
OnFloorItemClickListener listener;
static public ArrayList<FloorData> floors;
private Context context;
private LayoutInflater layoutInflater;
private OnItemClickListener mListener = null;
public FloorAdapter(ArrayList<FloorData> floors, Context context) {
this.floors = floors;
this.context = context;
this.layoutInflater = LayoutInflater.from(context);
}
public interface OnItemClickListener{
void onItemClick(View v, int pos);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.mListener = listener ;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.signle_floor, parent, false);
return new GridViewHolder(view);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((GridViewHolder)holder).recyclerView.setAdapter(new RoomAdapter(context, floors.get(position).rooms));
((GridViewHolder)holder).recyclerView.setLayoutManager(new GridLayoutManager(context, 5));
((GridViewHolder)holder).recyclerView.setHasFixedSize(true);
((GridViewHolder)holder).tvFloorNum.setText(String.valueOf(floors.get(position).floorNum));
}
#Override
public int getItemCount() {
return floors.size();
}
#Override public void onItemClick(RecyclerView.ViewHolder holder, View view, int position) {
if(listener != null){
listener.onItemClick(holder,view,position);
}
}
#Override
public int getItemViewType(int position) {
return floors.get(position).id;
}
public class GridViewHolder extends RecyclerView.ViewHolder {
RecyclerView recyclerView;
TextView tvFloorNum;
Button btnPlusRoom;
public GridViewHolder(View itemView) {
super(itemView);
recyclerView = itemView.findViewById(R.id.rvRooms);
tvFloorNum = itemView.findViewById(R.id.tvFloorNum);
btnPlusRoom = (Button)itemView.findViewById(R.id.btnPlusRoom);
btnPlusRoom.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v)
{
int pos = getAdapterPosition();
if (pos != RecyclerView.NO_POSITION)
{
if(mListener != null){
mListener.onItemClick(v, pos);
}
}
}
});
}
}
}

Your TextView is null, because you are missing the findViewById():
You find the Id on a View, in this case, it is the itemView
The function was not recognised because you would've just called findViewById() & ViewHolder does not have that method,
You should've called itemView.findViewById() instead.
Try this:
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView tvRoomNum;
public CustomViewHolder(View itemView) {
super(itemView);
tvRoomNum = itemView.findViewById(R.id.your_textview_id) // THIS
tvRoomNum.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent intent = new Intent(view.getContext(), PlusStudentActivity.class);
intent.putExtra("studentList", room.students);
context.startActivity(intent);
}
});
}
}

how can fillter the recyclerView

how can i filter Recycler View using SearchView
i try all the video tuturial but all of them get thier item Recycler View from a list
but i get my item from db and dont know how should i do this
this is my adapter Code
public class AthleteAdapter extends RecyclerView.Adapter<AthleteAdapter.AthleteHolder> {
private List<Athlete> athletes = new ArrayList<>();
private OnItemClickListener listener;
#NonNull
#Override
public AthleteHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemview = LayoutInflater.from(parent.getContext()).inflate(R.layout.athlete_item, parent, false);
return new AthleteHolder(itemview);
}
#Override
public void onBindViewHolder(#NonNull AthleteHolder holder, int position) {
Athlete currnetAthlete = athletes.get(position);
holder.textViewName.setText(currnetAthlete.getAthlete_name());
holder.textViewLastname.setText(currnetAthlete.getAthlete_lastname());
holder.textView_phonenumber.setText(currnetAthlete.getAthlete_phonenumber());
holder.textViewTime1.setText(String.valueOf(currnetAthlete.getSign_in_time()));
holder.textViewTime2.setText(String.valueOf(currnetAthlete.getCheck_tution_time()));
}
public void setAthletes(List<Athlete> athletes) {
this.athletes = athletes;
notifyDataSetChanged();
}
public Athlete getposition(int position) {
return athletes.get(position);
}
#Override
public int getItemCount() {
return athletes.size();
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.listener = listener;
}
public interface OnItemClickListener {
void onItemClick(Athlete athlete);
}
class AthleteHolder extends RecyclerView.ViewHolder {
private TextView textViewName, textViewLastname, textView_phonenumber, textViewTime1, textViewTime2;
public AthleteHolder(#NonNull View itemView) {
super(itemView);
textViewName = itemView.findViewById(R.id.name_main);
textViewLastname = itemView.findViewById(R.id.lastname_main);
textView_phonenumber = itemView.findViewById(R.id.textView_number);
textViewTime1 = itemView.findViewById(R.id.time1);
textViewTime2 = itemView.findViewById(R.id.time2);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position = getAdapterPosition();
if (listener != null && position != RecyclerView.NO_POSITION) {
listener.onItemClick(athletes.get(position));
}
}
});
}
}
}

Step 1 : Get all data from db and give that list to Adapter
usersList = db.getAll();
adapter = new dataAdapter(getApplicationContext(), usersList);
adapter.setdatainterfacemethod(this);
Step 2 : get Text from Searchview
sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
filter(s.toString());
}
return false;
}
});
Step 3 : compare searchview text and list text if exits then give list to adapter
public void filter(String text) {
List<Users> name = new ArrayList<>();
for (Users u : usersList) {
if (u.getNAME().toLowerCase().contains(text.toLowerCase())) {
name.add(u);
}
}
adapter.filterlist(name);
}
Step 4 :- change list and notify adapter (in adapter class)
public void filterlist(List<Users> name) {
this.usersList = name;
notifyDataSetChanged();
}
--------------------- Adapter class -----------------
public class dataAdapter extends RecyclerView.Adapter<dataAdapter.viewholder> {
public List<Users> usersList;
Context context;
dataInterface dataInterface;
public dataAdapter(Context context, List<Users> usersList) {
this.usersList = usersList;
this.context = context;
}
public void setdatainterfacemethod(dataInterface dataInterface) {
this.dataInterface = dataInterface;
}
#NonNull
#Override
public viewholder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.include_recycle_demo, viewGroup, false);
return new viewholder(view);
}
#Override
public void onBindViewHolder(#NonNull final viewholder viewholder, final int i) {
}
#Override
public int getItemCount() {
return usersList.size();
}
public void filterlist(List<Users> name) {
this.usersList = name;
notifyDataSetChanged();
}
public class viewholder extends RecyclerView.ViewHolder {
public viewholder(#NonNull View itemView) {
super(itemView);
}
}
}

getAdapterPosition not doing what it is supposed to do

I have a RecyclerView Fragment to which I added a Filter Search in an edit text. It works, but when I click in a Card of the Recycler, it goes to the wrong detail. My best guess is that it's getting the wrong position from the getAdapterPosition since let's say I have this list {a,b,c,d,e,f,g,h}. when I filter and get two itmes left like {d,g}. If I click d it redirects to a, if I click g it redirects to b.
This is my RecyclerView
public class RecyclerProfile extends Fragment implements
Adapter.AdapterListener, com.example.cake.profiling.Adapter.SearchListener
{
private RecyclerListener recyclerListener;
private List<Profile> profiles = (new DAOProfile()).getProfile();
private Adapter recyclerAdapter= new Adapter(profiles, this);
public RecyclerProfile() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view= inflater.inflate(R.layout.fragment_recycler_profile,
container, false);
RecyclerView recyclerView = view.findViewById(R.id.recyclerProfile);
EditText editText = view.findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int
count) {
}
#Override
public void afterTextChanged(Editable s) {
filter(s.toString());
}
});
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new
LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(recyclerAdapter);
setHasOptionsMenu(true);
return view;
}
private void filter(String text){
ArrayList<Profile> filteredList = new ArrayList<>();
for (Profile profile: profiles){
if (profile.getName().toLowerCase().contains(text.toLowerCase())){
filteredList.add(profile);
}
}
recyclerAdapter.filterList(filteredList);
profiles = new ArrayList<>(filteredList);
}
#Override
public void listen(Profile profile, Integer position) {
recyclerListener.send(profile, position);
}
#Override
public void profileSelected(Profile profile) {
}
//INTERFACE
public interface RecyclerListener {
void send(Profile profile, Integer position);
}
//ON ATTACH
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.recyclerListener = (RecyclerListener) context;
}
}
This is my Adapter
public class Adapter extends RecyclerView.Adapter<Adapter.ProfileViewHolder> {
private List<Profile> profiles;
private AdapterListener adapterListener;
//CONSTRUCTOR
public Adapter(List<Profile> profiles,AdapterListener adapterListener) {
this.profiles = profiles;
this.adapterListener = adapterListener;
}
#NonNull
#Override
public Adapter.ProfileViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.card_profile, parent, false);
ProfileViewHolder profileViewHolder = new ProfileViewHolder(view);
return profileViewHolder;
}
#Override
public void onBindViewHolder(#NonNull Adapter.ProfileViewHolder holder, int position) {
Profile profile = profiles.get(position);
holder.setter(profile);
}
#Override
public int getItemCount() {
return profiles.size();
}
public void filterList (ArrayList<Profile> filteredList){
profiles = filteredList;
notifyDataSetChanged();
}
//VIEWHOLDER
class ProfileViewHolder extends RecyclerView.ViewHolder{
private ImageView image;
private TextView name;
public ProfileViewHolder(View itemView) {
super(itemView);
name = itemView.findViewById(R.id.nameProfile);
image = itemView.findViewById(R.id.imageProfile);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Profile profile = profile.get(getAdapterPosition());
adapterListener.receive(profile, getAdapterPosition());
}
});
}
public void setter (Profile profile){
name.setText(profile.getName());
image.setImageResource(profile.getImage());
}
}
public interface AdapterListener {
void receive(Profile profile, Integer position);
}
}

getAdapterPosition()
this will return the position of the item of current data set. This is what I'd do
class ProfileViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageView image;
private TextView name;
Profile mProfile;
public ProfileViewHolder(View itemView) {
super(itemView);
name = itemView.findViewById(R.id.nameProfile);
image = itemView.findViewById(R.id.imageProfile);
name.setOnClickListener(this);
image.setOnClickListener(this);
}
public void setter (Profile profile){
if(profile != null) {
mProfile = profile;
name.setText(mProfile.getName());
image.setImageResource(mProfile.getImage());
}
}
}
#Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.item_nameProfile:
case R.id.item_imageProfile:
for(int i = 0 ; i < profiles.size() ; i++) {
if(profiles.get(i).getName().equalsIgnoreCase(mProfile.getName()) {
adapterListener.receive(profiles.get(i), i);
break;
}
}
break;
}
}
public interface AdapterListener {
void receive(Profile profile, Integer position);
}
}

implementing "add to favourite" mechanism in RecyclerView

i have a recyclerView with two sections regular and Favourites and for populating my RecyclerView i have List<Object> my object class :
public class Object {
String id,channelName;
boolean isFavorite;
}
now i want to put the values which have isfavorite == true to top of my recyclerView inside my Favourite section but i don't know where to start or exactly what to do ? do i have to sort the List<Object> with booleans ? if anybody can give me a little hint or guidance then it'll be so helpful for me,
please this image for better understanding ,
this is what i'm trying to get
i added the Section in my RecyclerView by SimpleSectionedRecyclerViewAdapter

class DataModal
{
public String title;
public boolean isFavourite;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public boolean isFavourite() {
return isFavourite;
}
public void setIsFavourite(boolean isFavourite) {
this.isFavourite = isFavourite;
}
}
public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
private final Context mContext;
private List<DataModal> mData;
public void add(DataModal s,int position) {
position = position == -1 ? getItemCount() : position;
mData.add(position,s);
notifyItemInserted(position);
}
public void remove(int position){
if (position < getItemCount() ) {
mData.remove(position);
notifyItemRemoved(position);
}
}
public static class SimpleViewHolder extends RecyclerView.ViewHolder {
public final TextView title;
public SimpleViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.simple_text);
}
}
public SimpleAdapter(Context context, ArrayList<DataModal> data) {
mContext = context;
if (data != null)
mData = data;
else mData = new ArrayList<DataModal>();
}
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(mContext).inflate(R.layout.simple_item, parent, false);
return new SimpleViewHolder(view);
}
#Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {
DataModal data = mData.get(position);
holder.title.setText(data.getTitle());
holder.title.setOnClickListener(new Listener(position,mData.get(position)));
}
class Listener implements View.OnClickListener
{
DataModal Data;
int position;
Listener(int position,DataModal Data)
{
this.Data = Data;
this.position = position;
}
#Override
public void onClick(View view) {
if(Data.isFavourite())
{
//mark the view as unfavorite
}
else{
//mark the view as favorite
}
Toast.makeText(mContext,"Position ="+position,Toast.LENGTH_SHORT).show();
}
}
#Override
public int getItemCount() {
return mData.size();
}
}

public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
private final Context mContext;
private List<String> mData;
public void add(String s,int position) {
position = position == -1 ? getItemCount() : position;
mData.add(position,s);
notifyItemInserted(position);
}
public void remove(int position){
if (position < getItemCount() ) {
mData.remove(position);
notifyItemRemoved(position);
}
}
public static class SimpleViewHolder extends RecyclerView.ViewHolder {
public final TextView title;
public SimpleViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.simple_text);
}
}
public SimpleAdapter(Context context, String[] data) {
mContext = context;
if (data != null)
mData = new ArrayList<String>(Arrays.asList(data));
else mData = new ArrayList<String>();
}
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(mContext).inflate(R.layout.simple_item, parent, false);
return new SimpleViewHolder(view);
}
#Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {
holder.title.setText(mData.get(position));
holder.title.setOnClickListener(new Listener(position,mData.get(position),false,favview));
}
class Listener implements View.OnClickListener
{
ImageView favoriteView;
int position;
Listener(int position,String Data,boolean isFavourite,ImageView favoriteView)
{
this.favoriteView = favoriteView;
this.position = position;
}
#Override
public void onClick(View view) {
if(isFavourite)
{
//mark the view as unfavorite
}
else{
//mark the view as favorite
}
Toast.makeText(mContext,"Position ="+position,Toast.LENGTH_SHORT).show();
}
}
#Override
public int getItemCount() {
return mData.size();
}
}