I'm currently building a schedule app where users can input information, and the app will organize the information in a list with each day of the week as the header with each corresponding activity under the day. I'm using a parent child recyclerview to do this (i.e. each day of the week is a part of the parent recyclerview and each activity in the schedule is part of the child recyclerview). Right now I'm trying to add a swipe to delete information in the child recyclerview. Does anyone know how I would go about doing this using the parent child recyclerview configuration, where I have two different adapters for each recyclerview?
Code for Parent RecyclerView:
public class MainRecyclerViewAdapter extends RecyclerView.Adapter<MainRecyclerViewAdapter.ViewHolder> {
ArrayList<DayHeader> weekList;
private Context mContext;
public MainRecyclerViewAdapter(Context mContext, ArrayList<DayHeader> weekList) {
this.mContext = mContext;
this.weekList = weekList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.dayofweekheader,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
DayHeader section = weekList.get(position);
String nameofday = section.getDayName();
ArrayList<medinfo> meditems = section.getmMedItems();
holder.weekdayname.setText(nameofday);
MedicationAdapter childrecyclerAdapter = new MedicationAdapter(mContext,meditems);
holder.childrecyclerview.setAdapter(childrecyclerAdapter);
}
#Override
public int getItemCount() {
return weekList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView weekdayname;
RecyclerView childrecyclerview;
public ViewHolder(#NonNull View itemView) {
super(itemView);
weekdayname = itemView.findViewById(R.id.weekdayheader);
childrecyclerview = itemView.findViewById(R.id.childrecyclerview);
}
}
}
Code for Child RecyclerView:
public class MedicationAdapter extends RecyclerView.Adapter<MedicationAdapter.MedicationViewHolder>{
private ArrayList<medinfo> mMedList;
private Context mContext;
public static class MedicationViewHolder extends RecyclerView.ViewHolder {
public TextView mMedname;
public TextView mTime;
public TextView mNumbPills;
public ImageView popup;
public MedicationViewHolder(#NonNull View itemView) {
super(itemView);
mMedname = itemView.findViewById(R.id.medname);
mTime = itemView.findViewById(R.id.time);
mNumbPills = itemView.findViewById(R.id.numberofpills);
popup = itemView.findViewById(R.id.menumore);
}
}
public MedicationAdapter(Context mContext, ArrayList<medinfo> medList) {
this.mContext = mContext;
this.mMedList = medList;
}
#NonNull
#Override
public MedicationViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item,parent,false);
MedicationViewHolder mvh = new MedicationViewHolder(v);
return mvh;
}
#Override
public void onBindViewHolder(#NonNull MedicationViewHolder holder, int position) {
medinfo currentItem = mMedList.get(position);
String medName = "Medication: " + currentItem.getmMedName();
holder.mMedname.setText(medName);
String medTime = "Time: " + currentItem.getmTime();
holder.mTime.setText(medTime);
String numbPills = "# of Pills: " + currentItem.getmNumbPills();
holder.mNumbPills.setText(numbPills);
}
#Override
public int getItemCount() {
return mMedList.size();
}
public void removeItem(int position) {
mMedList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position,mMedList.size());
}
}
I also have this SwipeItem class:
public class SwipeItem extends ItemTouchHelper.SimpleCallback {
MedicationAdapter mMedAdapter;
SwipeItem(MedicationAdapter mMedAdapter){
super(0,ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT);
this.mMedAdapter = mMedAdapter;
}
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(#NonNull RecyclerView.ViewHolder viewHolder, int direction) {
int position = viewHolder.getBindingAdapterPosition();
this.mMedAdapter.removeItem(position);
}
}
So how can I implement the SwipeItem in my adapter codes to delete each child item?
Related
I am just practicing the RecyclerView. when I run the App my App crashed I check the log but i cant understand the problem can some help me im waiting for someone responce?
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private model[] localDataSet;
private TextView name,number;
public static class ViewHolder extends RecyclerView.ViewHolder {
private final TextView textView;
public ViewHolder(View view) {
super(view);
textView = (TextView) view.findViewById(R.id.name);
}
public TextView getTextView() {
return textView;
}
}
public CustomAdapter(model[] dataSet) {
localDataSet = dataSet;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
// Create a new view, which defines the UI of the list item
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.contacx, viewGroup, false);
view.findViewById(R.id.name);
view.findViewById(R.id.number);
return new ViewHolder(view);
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
name.setText(localDataSet[position].getName());
number.setText(localDataSet[position].getPhone());
}
#Override
public int getItemCount() {
return localDataSet.length;
}
}
You need to change the following things in your code:
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private model[] localDataSet;
//remove this from here.
//private TextView name,number;
public static class ViewHolder extends RecyclerView.ViewHolder {
//This should be from the layout you have passed in ViewHolder method. in your case from R.layout.contacx. This layout should have two textview with ids:- name and phone respectively.
private final TextView name, phone;
public ViewHolder(View view) {
super(view);
name = view.findViewById(R.id.name);
phone = view.findViewById(R.id.phone);
}
}
public CustomAdapter(model[] dataSet) {
localDataSet = dataSet;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
// Create a new view, which defines the UI of the list item
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.contacx, viewGroup, false);
//remvoe this from here.
//view.findViewById(R.id.name);
//view.findViewById(R.id.number);
return new ViewHolder(view);
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
//here you should call those view to bind your data like:
viewHolder.name.setText(localDataSet[position].getName());
viewHolder.phone.setText(String.valueOf(localDataSet[position].getPhone()));
}
#Override
public int getItemCount() {
return localDataSet.length;
}
}
Use ViewHolder for data bind. More safe
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {
private model[] localDataSet;
public static class ViewHolder extends RecyclerView.ViewHolder {
private final TextView name, number;
public ViewHolder(View view) {
super(view);
name = view.findViewById(R.id.name);
number = view.findViewById(R.id.phone);
}
public void bindData(model data) {
name.setText(data.getName());
number.setText(String.valueOf(data.getPhone()));
}
}
public CustomAdapter(model[] dataSet) {
localDataSet = dataSet;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
/* No Need
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.contacx, viewGroup, false);
view.findViewById(R.id.name);
view.findViewById(R.id.number);
*/
return new ViewHolder(LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.contacx, viewGroup, false););
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
/*
name.setText(localDataSet[position].getName());
number.setText(localDataSet[position].getPhone());
*/
viewHolder.bindData(localDataSet[position]);
}
#Override
public int getItemCount() {
return localDataSet.length;
}
}
I'm developping an app in which my main activity hosts different fragments via a SectionsPageAdapter. My question is about one of those fragments that roughtly looks like the image bellow:
My innerRecyclers lists differents items that I want to be able to remove by swiping and make the user validate the deletion via a DialogFragment. I was able to implement the swipe action but what I'm struggly to do is to implement a listener in the OuterRecycler for OnItemTouch so I can use an interface and send the action back to my fragment which will dispay my DialoFragment afterwards.
The code of my OuterRecycler currently looks like that:
public class OuterRecyclerAdapter extends RecyclerView.Adapter<OuterRecyclerAdapter.InsideRecyclerHolder> {
private final Context mContext;
private final String mText;
private final ArrayList<MainViewArrayListMasterList> mDataArrayList;
OuterRecyclerAdapter(Context context, ArrayList<MainViewArrayListMasterList> DataArrayList, String text) {
mContext = context;
mDataArrayList = RecyclerArrayListType;
mText = text;
}
#NonNull
#Override
public OuterRecyclerAdapter.InsideRecyclerHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater myInflater = LayoutInflater.from(mContext);
View myOwnView = myInflater.inflate(R.layout.outer_recycler, parent, false);
return new OuterRecyclerAdapter.InsideRecyclerHolder(myOwnView);
}
#Override
public void onBindViewHolder(#NonNull OuterRecyclerAdapter.InsideRecyclerHolder holder, int position) {
MainViewArrayListMasterList currentItem = mDataArrayList.get(position);
holder.CardTitle.setText(String.valueOf(currentItem.getmYear()));
LinearLayoutManager mLayoutManager = new LinearLayoutManager(mContext, LinearLayoutManager.VERTICAL, false);
holder.CardRecycler.setLayoutManager(mLayoutManager);
InnerRecyclerAdapter historyInnerView_Adapter = new InnerRecyclerAdapter(mContext, currentItem.getmArrayListStored(), mText);
new ItemTouchHelper(ListHistoryViewSwiped).attachToRecyclerView(holder.CardRecycler);
holder.CardRecycler.setAdapter(historyInnerView_Adapter);
}
#Override
public int getItemCount() {
return mDataArrayList.size();
}
static class InsideRecyclerHolder extends RecyclerView.ViewHolder {
final TextView CardTitle;
final RecyclerView CardRecycler;
InsideRecyclerHolder(#NonNull View itemView) {
super(itemView);
CardTitle = itemView.findViewById(R.id.TitleText);
CardRecycler = itemView.findViewById(R.id.Inside_Recycler);
}
}
ItemTouchHelper.SimpleCallback ListHistoryViewSwiped = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
}
};
}
Is OnItemTouchListener the good way to acheive this ? Or do I have to create a new callback method ?
I actually circumvented this issue by calling the DialogFragment from my OuterRecycler:
public class OuterRecyclerAdapter extends RecyclerView.Adapter<OuterRecyclerAdapter.InsideRecyclerHolder> {
private final Context mContext;
private final String mText;
private final ArrayList<MainViewArrayListMasterList> mDataArrayList;
private FragmentManager mFragmentManager;
OuterRecyclerAdapter(Context context, FragmentManager FragmentManager, ArrayList<MainViewArrayListMasterList> DataArrayList, String text) {
mContext = context;
mFragmentManager = FragmentManager;
mDataArrayList = RecyclerArrayListType;
mText = text;
}
#NonNull
#Override
public OuterRecyclerAdapter.InsideRecyclerHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater myInflater = LayoutInflater.from(mContext);
View myOwnView = myInflater.inflate(R.layout.outer_recycler, parent, false);
return new OuterRecyclerAdapter.InsideRecyclerHolder(myOwnView);
}
#Override
public void onBindViewHolder(#NonNull OuterRecyclerAdapter.InsideRecyclerHolder holder, int position) {
MainViewArrayListMasterList currentItem = mDataArrayList.get(position);
holder.CardTitle.setText(String.valueOf(currentItem.getmYear()));
LinearLayoutManager mLayoutManager = new LinearLayoutManager(mContext, LinearLayoutManager.VERTICAL, false);
holder.CardRecycler.setLayoutManager(mLayoutManager);
InnerRecyclerAdapter historyInnerView_Adapter = new InnerRecyclerAdapter(mContext, currentItem.getmArrayListStored(), mText);
new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(#NonNull RecyclerView.ViewHolder viewHolder, int direction) {
openMyDialog(currentItem.getmArrayListStored().get(viewHolder.getAdapterPosition()));
}
}).attachToRecyclerView(holder.CardRecycler);
holder.CardRecycler.setAdapter(historyInnerView_Adapter);
}
#Override
public int getItemCount() {
return mDataArrayList.size();
}
static class InsideRecyclerHolder extends RecyclerView.ViewHolder {
final TextView CardTitle;
final RecyclerView CardRecycler;
InsideRecyclerHolder(#NonNull View itemView) {
super(itemView);
CardTitle = itemView.findViewById(R.id.TitleText);
CardRecycler = itemView.findViewById(R.id.Inside_Recycler);
}
}
private void openMyDialog(MainViewArrayListRecycler itemToDelete) {
MyDialog myDialog = MyDialog.newInstance(itemToDelete);
myDialog.show(mFragmentManager, "MyDialogDialog");
}
}
i have a list and i showed that in recycler view
some of items have blue background and other items have gray background
i want to edit selected item background (
The selected item means the item that has been clicked )
this is my adapter class
public class UserAdapter extends RecyclerView.Adapter<UserAdapter.UserViewHolder> {
private Context context;
private List<User> users = new ArrayList<>();
public UserAdapter(List<User> users, Context context) {
this.users = users;
this.context = context;
}
#NonNull
#Override
public UserViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new UserViewHolder(LayoutInflater.from(context).inflate(R.layout.item_user, parent, false));
}
#Override
public void onBindViewHolder(#NonNull UserViewHolder holder, int position) {
holder.binUser(users.get(position), position);
}
#Override
public int getItemCount() {
return users.size();
}
public class UserViewHolder extends RecyclerView.ViewHolder {
private TextView tvName;
private RelativeLayout rlItemUser;
public UserViewHolder(#NonNull View itemView) {
super(itemView);
tvName = itemView.findViewById(R.id.tv_itemUser_name);
rlItemUser = itemView.findViewById(R.id.itemUser_rootView);
}
public void binUser(User user, int position){
tvName.setText(user.getName());
if (user.getMode().equals("passenger")){
rlItemUser.setBackgroundColor(context.getResources().getColor(R.color.colorGray));
tvName.setTextColor(context.getResources().getColor(R.color.colorPrimary));
} else if (user.getMode().equals("driver")){
rlItemUser.setBackgroundColor(context.getResources().getColor(R.color.colorPrimary));
tvName.setTextColor(context.getResources().getColor(R.color.colorGray));
}
}
}
in the bindUser method:
rlItemUser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
rtlItemUser.setBackgroundColor(context.getResources().getColor(your color);
adapter.notifyItemChanged(position);
}
});
The view seems not to bind to the ArrayList(ie private ArrayList mEvents;) that i passed to the class ,on the onBindViewHolder(ie holder.mTextView2.setText(current.getcity());) i can seem to access the textView variables(ie public TextView mTextview2;), that i declared in the view holder class. I have tried to make the variables as a member variable but it seems not to work well
public class eventsAdapter extends RecyclerView.Adapter {
private ArrayList<recycleview_items> mEvents;
public eventsAdapter(ArrayList<recycleview_items> passedArray){
//constructor for the adapter calls for which i created
mEvents = passedArray;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//we pass the layout of our card to the adapter here
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_listitem, parent, false);
eventViewHolder events = new eventViewHolder(v);
return events;
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
//we pass data from the array list we created to the views
recycleview_items current = mEvents.get(position);
holder.mImageView.setImageResource(current.getImageResource());
holder.mTextView1.setText(current.getname());
holder.mTextView2.setText(current.getcity());
}
#Override
public int getItemCount() {
return mEvents.size();
};
public static class eventViewHolder extends RecyclerView.ViewHolder{
public ImageView mImageview ;
public TextView mTextview;
public TextView mTextview2;
public eventViewHolder(#NonNull View itemView) {
super(itemView);
mImageview = itemView.findViewById(R.id.ImageView1);
mTextview = itemView.findViewById(R.id.text_view1);
mTextview2 = itemView.findViewById(R.id.text_view2);
}
}
}
public class eventsAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private ArrayList<recycleview_items> mEvents;
public eventsAdapter(ArrayList<recycleview_items> passedArray){
//constructor for the adapter calls for which i created
mEvents = passedArray;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//we pass the layout of our card to the adapter here
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_listitem, parent, false);
eventViewHolder events = new eventViewHolder(v);
return events;
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
//we pass data from the array list we created to the views
recycleview_items current = mEvents.get(position);
holder.bind(current);
}
#Override
public int getItemCount() {
return mEvents.size();
};
class eventViewHolder extends RecyclerView.ViewHolder{
public ImageView mImageview ;
public TextView mTextview;
public TextView mTextview2;
public eventViewHolder(#NonNull View itemView) {
super(itemView);
mImageview = itemView.findViewById(R.id.ImageView1);
mTextview = itemView.findViewById(R.id.text_view1);
mTextview2 = itemView.findViewById(R.id.text_view2);
public void bind(recycleview_items item){
//bind your items here
holder.mImageView.setImageResource(item.getImageResource());
holder.mTextView1.setText(item.getname());
holder.mTextView2.setText(item.getcity());
}
}
}
I've rewritten your code for you with slight modifications.
You should create adapter like this
extends RecyclerView.Adapter<eventsAdapter.eventViewHolder >
Also you should edit
public eventViewHolder onCreateViewHolder
And
onBindViewHolder(eventViewHolder holder, int position)
Try this
public class eventsAdapter extends RecyclerView.Adapter<eventsAdapter.eventViewHolder>{
private ArrayList<recycleview_items> mEvents;
public eventsAdapter(ArrayList<recycleview_items> passedArray){
//constructor for the adapter calls for which i created
mEvents = passedArray;
}
#NonNull
#Override
public eventViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_listitem, parent, false);
return new eventViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull eventViewHolder holder, int position) {
recycleview_items current = mEvents.get(position);
holder.mImageview.setImageResource(current.getImageResource());
holder.mTextview.setText(current.getname());
holder.mTextview2.setText(current.getcity());
}
#Override
public int getItemCount() {
return 0;
}
class eventViewHolder extends RecyclerView.ViewHolder {
ImageView mImageview;
TextView mTextview;
TextView mTextview2;
public eventViewHolder(View itemView) {
super(itemView);
mImageview = itemView.findViewById(R.id.ImageView1);
mTextview = itemView.findViewById(R.id.text_view1);
mTextview2 = itemView.findViewById(R.id.text_view2);
}
}
}
Almost every thing was in Your code that's i have done some modification.
Mate see your Holder View Class name its 'eventViewHolder' and for onBindViewHolder and onCreateViewHolder you're accessing the Recycler.ViewHolder so it's very obvious that you can't access those variable just change this..
#Override
public void onBindViewHolder(#NonNull eventsAdapter.eventViewHolder holder, int position) {
.....
}
and in
#NonNull
#Override
public eventsAdapter.eventViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
......
}
I'm trying to have my application display a specific layout when the arraylist PinnedSongs is empty.
I've created different viewholders and tried to inflate them depending on the PinnedSongs.size. Meaning, if it's 0, then the onCreateViewHolder should inflate a special layout. If it's different, then inflate another one.
public class RecyclerAdapterHome extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public class Viewholder extends RecyclerView.ViewHolder implements View.OnClickListener{
CardView home_cardView;
TextView home_textView;
TextView home_textView_2;
Button home_button;
Button home_button_2;
RelativeLayout parentlayout;
OnNoteListener_2 onNoteListener2;
public Viewholder(#NonNull View itemView, OnNoteListener_2 onNoteListener_2) {
super(itemView);
home_cardView = itemView.findViewById(R.id.cardview_2);
home_textView = itemView.findViewById(R.id.cardview_2_textview);
home_textView_2 = itemView.findViewById(R.id.cardview_2_textview_sub);
home_button = itemView.findViewById(R.id.play_button);
home_button_2 = itemView.findViewById(R.id.push_button);
parentlayout = itemView.findViewById(R.id.home_parentlayout);
home_button.setOnClickListener(this);
this.onNoteListener2 = onNoteListener_2;
}
#Override
public void onClick(View v) {
onNoteListener2.onClick(getAdapterPosition());
}
}
public class Viewholder_2 extends RecyclerView.ViewHolder {
TextView textView_3;
ImageView imageView;
RelativeLayout parentlayout;
public Viewholder_2(#NonNull View itemView) {
super(itemView);
textView_3 = itemView.findViewById(R.id.text_warning);
imageView = itemView.findViewById(R.id.icon);
parentlayout = itemView.findViewById(R.id.home_parentlayout);
}
}
public RecyclerAdapterHome(OnNoteListener_2 mOnNoteListener2, ArrayList<String> pinnedSongs, ArrayList<String> pinnedSongsArtists, Context mContext) {
this.mOnNoteListener2 = mOnNoteListener2;
this.PinnedSongs = pinnedSongs;
this.PinnedSongsArtists = pinnedSongsArtists;
this.mContext = mContext;
}
private ArrayList<String> PinnedSongs = new ArrayList<>();
private ArrayList<String> PinnedSongsArtists = new ArrayList<>();
private Context mContext;
private OnNoteListener_2 mOnNoteListener2;
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = null;
if (PinnedSongs.size()==0){
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.nothing, parent, false);
return new Viewholder_2(v);
}else{
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.homeviewholder,
parent, false);
return new Viewholder(v,mOnNoteListener2 );
}
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
if (PinnedSongs.size()==0){
Viewholder_2 viewholder_2 = (Viewholder_2) holder;
}else{
Viewholder viewholder = (Viewholder) holder;
viewholder.home_textView.setText(PinnedSongs.get(position));
viewholder.home_textView_2.setText(PinnedSongsArtists.get(position));
}
}
#Override
public int getItemCount() {
return PinnedSongs.size();
}
public interface OnNoteListener_2 {
void onClick(int position);
}
}
So far, the recyclerview shows nothing when the PinnedSongs list is at zero. But it shows something when it's above zero. Any idea on how I can fix it?
(I'm using the androidx libraries if it has anything to do with that).
It doesn't work because the getItemCount method returns 0 and the RecyclerView never tries to instantiate a view.
It means that onBindViewHolder is not called when the size=0.
You have different options to do it. One of these is:
#Override
public int getItemCount() {
return PinnedSongs.size() > 0 ? PinnedSongs.size() : 1;
}
#Override
public int getItemViewType(int position) {
if (PinnedSongs.size() == 0) {
return EMPTY_VIEW;
}
return super.getItemViewType(position);
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v;
if (viewType == EMPTY_VIEW) {
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.nothing, parent, false);
EmptyViewHolder emptyViewHolder = new EmptyViewHolder(v);
return emptyViewHolder;
}
//normal case
v = LayoutInflater.from(parent.getContext()).inflate(R.layout.homeviewholder, parent, false);
ViewHolder viewholder = new ViewHolder(v);
return viewholder;
}
public class EmptyViewHolder extends RecyclerView.ViewHolder {
public EmptyViewHolder(View itemView) {
super(itemView);
}
}
private static final int EMPTY_VIEW = 1000;