I have a nested recyclerview, and I just want it to display different item numbers for each item of the parent recyclerview.
It's supposed that each item implements number of view according to each model object list that's been passed to adapter
It may look like as the layout shown in this image
Here is my parent adapter code
public class ConstructionAdapter extends RecyclerView.Adapter<ConstructionAdapter.ConstructionViewHolder> {
private RecyclerView.RecycledViewPool viewPool = new RecyclerView.RecycledViewPool();
private final List<ConstructionModel> constructionList;
public ConstructionAdapter(List<ConstructionModel> constructionList) {
this.constructionList = constructionList;
}
#NonNull
#Override
public ConstructionViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.construction_cranes_view_item, parent, false);
return new ConstructionViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ConstructionViewHolder holder, int position) {
holder.setContent(constructionList.get(position));
}
#Override
public int getItemCount() {
return constructionList.size();
}
public class ConstructionViewHolder extends RecyclerView.ViewHolder {
private TextView categoeyTitleTV;
private RecyclerView constructionRecyclerView;
private ConstructionViewHolder(#NonNull View itemView) {
super(itemView);
categoeyTitleTV = itemView.findViewById(R.id.category_title_tv);
constructionRecyclerView = itemView.findViewById(R.id.construction_item_recycler);
}
private void setContent(ConstructionModel model) {
LinearLayoutManager layoutManager = new LinearLayoutManager(itemView.getContext());
constructionRecyclerView.setLayoutManager(layoutManager);
categoeyTitleTV.setText(model.getCraneCategory());
layoutManager.setInitialPrefetchItemCount(model.getSubCategoryList().size());
IndustrialCranesAdapter subCatAdapter = new IndustrialCranesAdapter(model.getSubCategoryList());
constructionRecyclerView.setAdapter(subCatAdapter);
constructionRecyclerView.setRecycledViewPool(viewPool);
}
}
}
Here is my Inner recyclerview adapter
public class IndustrialCranesAdapter extends RecyclerView.Adapter<IndustrialCranesAdapter.IndustrialCranesViewHolder> {
private final List<Crane> industrialCranesList;
public IndustrialCranesAdapter(List<Crane> industrialCranesList) {
this.industrialCranesList = industrialCranesList;
}
#NonNull
#Override
public IndustrialCranesViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.crane_item, parent, false);
return new IndustrialCranesViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull IndustrialCranesViewHolder holder, int position) {
holder.setCranesItems(industrialCranesList.get(position));
}
#Override
public int getItemCount() {
return industrialCranesList.size();
}
public class IndustrialCranesViewHolder extends RecyclerView.ViewHolder {
private TextView craneTitle;
private ImageView craneImage;
private IndustrialCranesViewHolder(#NonNull View itemView) {
super(itemView);
craneTitle = itemView.findViewById(R.id.industrial_crane_title);
craneImage = itemView.findViewById(R.id.industrial_crane_image_view);
itemView.getRootView().setOnClickListener(v->{
Toast.makeText(itemView.getContext(), "Clicked", Toast.LENGTH_SHORT).show();
});
}
private void setCranesItems(Crane crane){
craneTitle.setText(crane.getCraneTitle());
craneImage.setImageResource(crane.getCraneImage());
}
}
}
Related
I have a nested recyclerview with Parent RV: representing a category whereas Child RV: represents a list of items of a certain category. Currently I am getting null pointer exception but I have no idea why. I have 2 interface - 1st, takes the position of the child RV (selected item) and the 2nd one - gets the position of parent RV position (i.e. which category was selected), child RV position and title of the selected item.
Issue:
ParentRVAdapter.java:57 -> rvItemClickListener.onChildItemClick(holder.getAdapterPosition(),position,itemTitle);
CatalogItemChildRVAdapter.java:68 -> onItemListener.onItemClick(getAdapterPosition());
Parent Recycler View:
public class ParentRVAdapter extends RecyclerView.Adapter<ParentRVAdapter.ViewHolder> implements CatalogItemChildRVAdapter.onItemListener{
private Context context;
private List<CatalogCategories> categories;
private CatalogItemChildRVAdapter itemChildRVAdapter;
private List<CategoryItem> categoryItemList;
private RVItemClickListener rvItemClickListener;
public void setRvItemClickListener(RVItemClickListener rvItemClickListener) {
this.rvItemClickListener = rvItemClickListener;
}
public ParentRVAdapter(Context context, List<CatalogCategories> categories) {
this.context = context;
this.categories = categories;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(context).inflate(R.layout.home_parentrv_item,parent,false));
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.categoryTv.setText(categories.get(position).getCatTitles());
categoryItemList = categories.get(position).getCategoryItemList();
setCategoriesItemRV(holder.itemRv, categoryItemList);
itemChildRVAdapter.setMonItemListener(new CatalogItemChildRVAdapter.onItemListener() {
#Override
public void onItemClick(int position) {
String itemTitle = categoryItemList.get(position).getTitle();
rvItemClickListener.onChildItemClick(holder.getAdapterPosition(),position,itemTitle);
System.out.println("Works");
}
});
}
#Override
public int getItemCount() {
return categories.size();
}
#Override
public void onItemClick(int position) {}
public static final class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView categoryTv;
RecyclerView itemRv;
public ViewHolder(#NonNull View itemView) {
super(itemView);
categoryTv = itemView.findViewById(R.id.categoriesTv);
itemRv = itemView.findViewById(R.id.itemRv);
}
#Override
public void onClick(View view) {
}
}
private void setCategoriesItemRV(RecyclerView recyclerView, List<CategoryItem> categoryItemList){
itemChildRVAdapter = new CatalogItemChildRVAdapter(context,categoryItemList,this);
recyclerView.setLayoutManager(new LinearLayoutManager(context, RecyclerView.HORIZONTAL,false));
recyclerView.setAdapter(itemChildRVAdapter);
}
public interface RVItemClickListener{
void onChildItemClick (int parentPos, int childPos, String item);
}
}
Child RecyclerView:
public class CatalogItemChildRVAdapter extends RecyclerView.Adapter<CatalogItemChildRVAdapter.ViewHolder> {
private Context context;
private List<CategoryItem> categoryItemList;
private onItemListener monItemListener;
public void setMonItemListener(onItemListener monItemListener) {
this.monItemListener = monItemListener;
}
public CatalogItemChildRVAdapter(Context context, List<CategoryItem> categoryItemList, onItemListener monItemListener) {
this.context = context;
this.categoryItemList = categoryItemList;
this.monItemListener = monItemListener;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.childrv_eacat_item,parent,false);
return new ViewHolder(view,monItemListener);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.image.setImageResource(categoryItemList.get(position).getImage());
holder.itemname.setText(categoryItemList.get(position).getTitle());
}
#Override
public int getItemCount() {
return categoryItemList.size();
}
public static final class ViewHolder extends RecyclerView.ViewHolder {
ImageView image;
TextView itemname;
//onItemListener onItemListener;
int itempos;
public ViewHolder(#NonNull View itemView, onItemListener onItemListener) {
super(itemView);
//this.onItemListener = onItemListener;
image = itemView.findViewById(R.id.categoryitemIv1);
itemname = itemView.findViewById(R.id.categoryitemTv1);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onItemListener.onItemClick(getAdapterPosition());
itempos = getAdapterPosition();
System.out.println("Clicked at postion: "+itempos);
}
});
}
/* #Override
public void onClick(View view) {
onItemListener.onItemClick(getAdapterPosition());
itempos = getAdapterPosition();
System.out.println("Clicked at postion: "+itempos);
} */
}
public interface onItemListener{
void onItemClick(int position);
} }
I have an adapter that is showing limited Items on Fragment.
#Override
public int getItemCount() {
int limit = 7;
return Math.min(latestProductModelList.size(),limit);
}
and I want to show all the items of list in recyclerview when I click on ViewAll button using the same adapter on another acitivity.
this is my adapter.
`
public class LatestProductAdapter extends RecyclerView.Adapter<LatestProductAdapter.ViewHolder> {
List<LatestProductModel> latestProductModelList = new ArrayList<>();
Context context;
LatestProductClickInterface latestProductClickInterface;
public LatestProductAdapter(Context context, LatestProductClickInterface latestProductClickInterface) {
this.context = context;
this.latestProductClickInterface = latestProductClickInterface;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.item_layout,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
LatestProductModel latestProductModel = latestProductModelList.get(position);
Glide.with(context).load(latestProductModel.getImage()).into(holder.itemImage);
holder.itemTitle.setText(latestProductModel.getTitle());
holder.itemView.setOnClickListener(v -> {
latestProductClickInterface.OnLatestProductClicked(latestProductModelList.get(position));
});
}
#Override
public int getItemCount() {
int limit = 7;
return Math.min(latestProductModelList.size(),limit);
}
#SuppressLint("NotifyDataSetChanged")
public void updateList(List<LatestProductModel> latestProductModels){
latestProductModelList.clear();
latestProductModelList.addAll(latestProductModels);
Collections.reverse(latestProductModelList);
notifyDataSetChanged();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
ImageView itemImage;
TextView itemTitle;
public ViewHolder(#NonNull View itemView) {
super(itemView);
itemImage = itemView.findViewById(R.id.item_img);
itemTitle = itemView.findViewById(R.id.item_title);
}
}
}
`
How to achieve this?
Or is there another way to achieve this?
kindly help me.
You can use bellow codes for your adapter:
public class LatestProductAdapter extends RecyclerView.Adapter<LatestProductAdapter.ViewHolder> {
List<LatestProductModel> latestProductModelList = new ArrayList<>();
Context context;
LatestProductClickInterface latestProductClickInterface;
private boolean shouldShowAllItems;
public LatestProductAdapter(Context context, LatestProductClickInterface latestProductClickInterface , boolean shouldShowAllItems) {
this.context = context;
this.latestProductClickInterface = latestProductClickInterface;
this.shouldShowAllItems = shouldShowAllItems;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.item_layout,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
LatestProductModel latestProductModel = latestProductModelList.get(position);
Glide.with(context).load(latestProductModel.getImage()).into(holder.itemImage);
holder.itemTitle.setText(latestProductModel.getTitle());
holder.itemView.setOnClickListener(v -> {
latestProductClickInterface.OnLatestProductClicked(latestProductModelList.get(position));
});
}
#Override
public int getItemCount() {
if (shouldShowAllItems){
return latestProductModelList.size();
}else {
int limit = 7;
return Math.min(latestProductModelList.size(), limit);
}
}
#SuppressLint("NotifyDataSetChanged")
public void updateList(List<LatestProductModel> latestProductModels){
latestProductModelList.clear();
latestProductModelList.addAll(latestProductModels);
Collections.reverse(latestProductModelList);
notifyDataSetChanged();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
ImageView itemImage;
TextView itemTitle;
public ViewHolder(#NonNull View itemView) {
super(itemView);
itemImage = itemView.findViewById(R.id.item_img);
itemTitle = itemView.findViewById(R.id.item_title);
}
}
}
and create adapter object accourding your need:
LatestProductAdapter latestProductAdapter = LatestProductAdapter(context , this ,//true or false);
My Title is kind of hard to understand but basically when I add items into my database is should display it in a RecyclerView. Now in my RecyclerView I have two layouts but the problem is the first item of my database goes behind my first item in my other layout. So if I have 3 items in my database, it shows only 2 items from the database and the first item hides behind my first item in the RecyclerView which is a different layout that does not use the database at all.
This is my code:
FirebaseRecyclerOptions<Event> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<Event>()
.setQuery(query1, Event.class).build();
AccAdapter = new FirebaseRecyclerAdapter<Event, RecyclerView.ViewHolder>(firebaseRecyclerOptions){
final static int TYPE_HEADER = 0;
final static int TYPE_ITEM = 1;
#Override
public int getItemViewType(int position) {
if (position == 0) return TYPE_HEADER;
return TYPE_ITEM;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_HEADER){
View view = LayoutInflater.from(getActivity()).inflate(R.layout.recycler_view_row_add_items,
parent, false);
return new ProdudctHolder3(view);
} else {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.recycler_view_row_acc,
parent, false);
return new ProductHolder2(view);
}
}
#Override
protected void onBindViewHolder(final RecyclerView.ViewHolder holder, int position, final Event model) {
if (holder instanceof ProdudctHolder3){
((ProdudctHolder3) holder).addBackground.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(getActivity(), AccAddItems.class ));
}
});
} else{
final ProductHolder2 productHolder2 = (ProductHolder2) holder;
productHolder2.mName.setText(model.getName());
productHolder2.view.setBackgroundResource(getBackgroundDrawable(Integer.valueOf(model.getProductAmount())));
productHolder2.mbackground.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
dialog = new Dialog(getActivity());
dialog.setContentView(R.layout.popup_edit_product);
SeekBar amountSeekBar = dialog.findViewById(R.id.amountSeekBar);
amountSeekBar.setMax(100);
amountSeekBar.setProgress(Integer.valueOf(model.getProductAmount()));
amountSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
progress = i;
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
getRef(holder.getAdapterPosition()).child("productAmount").setValue(String.valueOf(progress));
dialog.dismiss();
}
});
dialog.show();
}
});
productHolder2.mbackground.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
final PopupMenu popupMenu = new PopupMenu(getActivity(), productHolder2.mbackground);
popupMenu.inflate(R.menu.menu_acc);
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()){
case R.id.deleteProduct:
getRef(productHolder2.getAdapterPosition()).removeValue();
popupMenu.dismiss();
return true;
default:
return false;
}
}
});
popupMenu.show();
return true;
}
});
}
}
};
mAccRecyclerViewRef.setAdapter(AccAdapter);
My two Product Holders
private class ProdudctHolder3 extends RecyclerView.ViewHolder{
private RelativeLayout addBackground;
public ProdudctHolder3(View itemView) {
super(itemView);
addBackground = itemView.findViewById(R.id.mBackground2);
}
}
private class ProductHolder2 extends RecyclerView.ViewHolder{
private TextView mName;
private RelativeLayout mbackground;
private View view;
public ProductHolder2(View itemView) {
super(itemView);
mName = itemView.findViewById(R.id.ItemName);
mbackground = itemView.findViewById(R.id.mBackground1);
view = itemView.findViewById(R.id.amountIndicator);
}
}
The ideal solution would have been to set two adapters on a single RecyclerView but unfortunatelly this is not possible.
However, you can make a single custom Adapter that handles two types of items. I will explain this by getting an example.
Let's assume you need to display objects of two types, humans and aliens. Your objects require completely different layouts and completely different ViewHolders. Please see the below code for the ViewHolders:
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static class HumanViewHolder extends RecyclerView.ViewHolder {
public HumanViewHolder(View itemView) {
super(itemView);
//Prepare your ViewHolder
}
public void bind(Human human) {
//Display your human object
}
}
private static class AlienViewHolder extends RecyclerView.ViewHolder {
public AlienViewHolder(View itemView) {
super(itemView);
//Prepare your ViewHolder
}
public void bind(Alien alien) {
//Display your alien object
}
}
}
First you need to add two different constants to your adapter representing both type of views:
private static final int ITEM_TYPE_HUMAN;
private static final int ITEM_TYPE_ALIEN;
To keep things simple, let's also assume you store your objects in a list:
private List<Object> items = new ArrayList<>();
public MyAdapter(List<Object> items) {
this.items.addAll(items);
//Other stuff if needed
}
Now, the first you need to do, is to implement getItemViewType() method:
#Override
public int getItemViewType(int position) {
if (items.get(position) instanceof Human) {
return ITEM_TYPE_HUMAN;
} else {
return ITEM_TYPE_ALIEN;
}
}
Second, you need to use the item type inside the onCreateViewHolder() method like this:
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
if (viewType == ITEM_TYPE_HUMAN) {
View view = layoutInflater.inflate(R.layout.item_human, parent, false);
return new HumanViewHolder(view);
} else {
View view = layoutInflater.inflate(R.layout.item_alien, parent, false);
return new AlienViewHolder(view);
}
}
In the end, you just need to bind the proper view holder like this:
#Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
Object item = items.get(position);
if (viewHolder instanceof HumanViewHolder) {
((HumanViewHolder) viewHolder).bind((Human) item);
} else {
((AlienViewHolder) viewHolder).bind((Alien) item);
}
}
Why use the Firebase Recycler Adapter when you could easily make a custom one? If I understood well you want an item to be fixed at position 0 (header) while others will be added below the first one, right? If so, here is a solution I like to use:
public interface ViewType {
public int getViewType();
}
public interface ViewTypeDelegateAdapter {
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent);
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item);
}
public class ViewTypes {
public static int HEADER = 0
public static int ITEM = 1
}
public class ProductDelegateAdapter implements ViewTypeDelegateAdapter {
private int resID;
private Context context;
public ProductDelegateAdapter(int resID, Context context) {
this.resID = resID;
this.context = context;
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent) {
return new ProductHolder(LayoutInflater.from(parent.context).inflate(resID, parent, false));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item) {
(holder as ProductHolder).bind("test");
}
class ProductHolder extends RecyclerView.ViewHolder {
public ProductHolder(View view) {
super(view);
}
public void bind(String test) {
}
}
}
public class HeaderDelegateAdapter implements ViewTypeDelegateAdapter {
private int resID;
private Context context;
public ProductDelegateAdapter(int resID, Context context) {
this.resID = resID;
this.context = context;
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent) {
return new HeaderHolder(LayoutInflater.from(parent.context).inflate(resID, parent, false));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item) {
(holder as HeaderHolder).bind("test");
}
class HeaderHolder extends RecyclerView.ViewHolder {
public HeaderHolder(View view) {
super(view);
}
public void bind(String test) {
}
}
}
public class AccAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private Context context;
private List<ViewType> items;
private SparseArrayCompat<ViewTypeDelegateAdapter> delegateAdapters;
private ViewType headerItem;
public AccAdapter(Context context) {
this.context = context;
this.items = new ArrayList();
this.delegateAdapters = new SparseArrayCompat();
this.headerItem = new ViewType() {
#Override
public int getViewType() {
return ViewTypes.HEADER;
}
};
this.items.add(this.headerItem);
this.delegateAdapters.put(ViewTypes.HEADER, HeaderDelegateAdapter(R.id.test, this.context));
this.delegateAdapters.put(ViewTypes.ITEM, ProductDelegateAdapter(R.id.test, this.context));
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, Int viewType) {
return delegateAdapters.get(viewType).onCreateViewHolder(parent);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, Int position) {
delegateAdapters.get(getItemViewType(position)).onBindViewHolder(holder, items[position])
}
#Override
public Int getItemViewType(Int position) {
return items.get(position).getViewType();
}
#Override
public Int getItemCount() {
return items.getSize();
}
public void add(ViewType viewType) {
val initPosition = this.items.size - 1
this.items.add(item)
notifyItemRangeChanged(initPosition, this.items.size + 1)
}
}
public class Event implements ViewType {
private String id;
#Override
public int getViewType() {
return ViewTypes.ITEM;
}
}
Excuse me for some syntax errors, I've translated to Java from Kotlin to help you. Hope it helps!
In my SectionsListAdapter adapter i have nested Adapter named MonthLessonsList, after get date from web service and set new data and call notifyDataSetChanged method for adapter, main adapter as SectionsListAdapter can be refresh, but nested adapter dont refresh and after calling notifyDataSetChanged for that, doesn't work correctly and don't show new data
call and set new data from Fragment:
monthSectionsItems = SQLite.select().from(MonthSections.class).queryList();
adapter.setData(monthSectionsItems);
and my Adapter with nested adapter:
public class SectionsListAdapter extends RecyclerView.Adapter<SectionsListAdapter.MyViewHolder> {
private final OnItemSelected listener;
private List<MonthSections> list;
private Context context;
private MonthLessonsList lessonsListAdapter;
public SectionsListAdapter(List<MonthSections> followingsList, Context mContext, OnItemSelected listener) {
this.list = followingsList;
this.context = mContext;
this.listener = listener;
}
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.sections_list_row, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(#NonNull final MyViewHolder holder, final int position) {
holder.indicatorIcon.setText(list.get(position).getSection_month_name());
...
List<SectionLesson> lessonsList = list.get(position).getLessons();
lessonsListAdapter = new MonthLessonsList(lessonsList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(context);
holder.userChildCategories.setLayoutManager(mLayoutManager);
holder.userChildCategories.setAdapter(lessonsListAdapter);
...
}
#Override
public int getItemCount() {
return list.size();
}
public void setData(List<MonthSections> data) {
list.clear();
list.addAll(data);
notifyDataSetChanged();
lessonsListAdapter.notifyDataSetChanged();
}
public List<MonthSections> getData() {
return list;
}
class MyViewHolder extends RecyclerView.ViewHolder {
...
public MyViewHolder(View view) {
super(view);
ButterKnife.bind(this, view);
section_title.setGravity(Gravity.RIGHT);
}
}
public class MonthLessonsList extends RecyclerView.Adapter<MonthLessonsList.LessonsViewHolder> {
private List<SectionLesson> lessonItem;
public class LessonsViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public LessonsViewHolder(View view) {
super(view);
title = view.findViewById(R.id.title);
}
}
public MonthLessonsList(List<SectionLesson> lists) {
this.lessonItem = lists;
}
#Override
public LessonsViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.child_list_row, parent, false);
return new LessonsViewHolder(itemView);
}
#SuppressLint("SetTextI18n")
#Override
public void onBindViewHolder(#NonNull LessonsViewHolder holder, int position) {
SectionLesson lesson = lessonItem.get(position);
holder.title.setText("درس: " + (position + 1) + ") " + lesson.getTitle());
}
#Override
public int getItemCount() {
return lessonItem.size();
}
}
}
Declare child adapter inside onBindViewHolder, and remove from global level.
And no need to notify child adapter. Because that will be automatically filled when parent onBindViewHolder is called.
Like
MonthLessonsList lessonsListAdapter = new MonthLessonsList(lessonsList);
holder.userChildCategories.setAdapter(lessonsListAdapter);
My Title is kind of hard to understand but basically when I add items into my database is should display it in a RecyclerView. Now in my RecyclerView I have two layouts but the problem is the first item of my database goes behind my first item in my other layout. So if I have 3 items in my database, it shows only 2 items from the database and the first item hides behind my first item in the RecyclerView which is a different layout that does not use the database at all.
This is my code:
FirebaseRecyclerOptions<Event> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<Event>()
.setQuery(query1, Event.class).build();
AccAdapter = new FirebaseRecyclerAdapter<Event, RecyclerView.ViewHolder>(firebaseRecyclerOptions){
final static int TYPE_HEADER = 0;
final static int TYPE_ITEM = 1;
#Override
public int getItemViewType(int position) {
if (position == 0) return TYPE_HEADER;
return TYPE_ITEM;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_HEADER){
View view = LayoutInflater.from(getActivity()).inflate(R.layout.recycler_view_row_add_items,
parent, false);
return new ProdudctHolder3(view);
} else {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.recycler_view_row_acc,
parent, false);
return new ProductHolder2(view);
}
}
#Override
protected void onBindViewHolder(final RecyclerView.ViewHolder holder, int position, final Event model) {
if (holder instanceof ProdudctHolder3){
((ProdudctHolder3) holder).addBackground.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(getActivity(), AccAddItems.class ));
}
});
} else{
final ProductHolder2 productHolder2 = (ProductHolder2) holder;
productHolder2.mName.setText(model.getName());
productHolder2.view.setBackgroundResource(getBackgroundDrawable(Integer.valueOf(model.getProductAmount())));
productHolder2.mbackground.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
dialog = new Dialog(getActivity());
dialog.setContentView(R.layout.popup_edit_product);
SeekBar amountSeekBar = dialog.findViewById(R.id.amountSeekBar);
amountSeekBar.setMax(100);
amountSeekBar.setProgress(Integer.valueOf(model.getProductAmount()));
amountSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
progress = i;
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
getRef(holder.getAdapterPosition()).child("productAmount").setValue(String.valueOf(progress));
dialog.dismiss();
}
});
dialog.show();
}
});
productHolder2.mbackground.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
final PopupMenu popupMenu = new PopupMenu(getActivity(), productHolder2.mbackground);
popupMenu.inflate(R.menu.menu_acc);
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()){
case R.id.deleteProduct:
getRef(productHolder2.getAdapterPosition()).removeValue();
popupMenu.dismiss();
return true;
default:
return false;
}
}
});
popupMenu.show();
return true;
}
});
}
}
};
mAccRecyclerViewRef.setAdapter(AccAdapter);
My two Product Holders
private class ProdudctHolder3 extends RecyclerView.ViewHolder{
private RelativeLayout addBackground;
public ProdudctHolder3(View itemView) {
super(itemView);
addBackground = itemView.findViewById(R.id.mBackground2);
}
}
private class ProductHolder2 extends RecyclerView.ViewHolder{
private TextView mName;
private RelativeLayout mbackground;
private View view;
public ProductHolder2(View itemView) {
super(itemView);
mName = itemView.findViewById(R.id.ItemName);
mbackground = itemView.findViewById(R.id.mBackground1);
view = itemView.findViewById(R.id.amountIndicator);
}
}
The ideal solution would have been to set two adapters on a single RecyclerView but unfortunatelly this is not possible.
However, you can make a single custom Adapter that handles two types of items. I will explain this by getting an example.
Let's assume you need to display objects of two types, humans and aliens. Your objects require completely different layouts and completely different ViewHolders. Please see the below code for the ViewHolders:
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static class HumanViewHolder extends RecyclerView.ViewHolder {
public HumanViewHolder(View itemView) {
super(itemView);
//Prepare your ViewHolder
}
public void bind(Human human) {
//Display your human object
}
}
private static class AlienViewHolder extends RecyclerView.ViewHolder {
public AlienViewHolder(View itemView) {
super(itemView);
//Prepare your ViewHolder
}
public void bind(Alien alien) {
//Display your alien object
}
}
}
First you need to add two different constants to your adapter representing both type of views:
private static final int ITEM_TYPE_HUMAN;
private static final int ITEM_TYPE_ALIEN;
To keep things simple, let's also assume you store your objects in a list:
private List<Object> items = new ArrayList<>();
public MyAdapter(List<Object> items) {
this.items.addAll(items);
//Other stuff if needed
}
Now, the first you need to do, is to implement getItemViewType() method:
#Override
public int getItemViewType(int position) {
if (items.get(position) instanceof Human) {
return ITEM_TYPE_HUMAN;
} else {
return ITEM_TYPE_ALIEN;
}
}
Second, you need to use the item type inside the onCreateViewHolder() method like this:
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
if (viewType == ITEM_TYPE_HUMAN) {
View view = layoutInflater.inflate(R.layout.item_human, parent, false);
return new HumanViewHolder(view);
} else {
View view = layoutInflater.inflate(R.layout.item_alien, parent, false);
return new AlienViewHolder(view);
}
}
In the end, you just need to bind the proper view holder like this:
#Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
Object item = items.get(position);
if (viewHolder instanceof HumanViewHolder) {
((HumanViewHolder) viewHolder).bind((Human) item);
} else {
((AlienViewHolder) viewHolder).bind((Alien) item);
}
}
Why use the Firebase Recycler Adapter when you could easily make a custom one? If I understood well you want an item to be fixed at position 0 (header) while others will be added below the first one, right? If so, here is a solution I like to use:
public interface ViewType {
public int getViewType();
}
public interface ViewTypeDelegateAdapter {
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent);
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item);
}
public class ViewTypes {
public static int HEADER = 0
public static int ITEM = 1
}
public class ProductDelegateAdapter implements ViewTypeDelegateAdapter {
private int resID;
private Context context;
public ProductDelegateAdapter(int resID, Context context) {
this.resID = resID;
this.context = context;
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent) {
return new ProductHolder(LayoutInflater.from(parent.context).inflate(resID, parent, false));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item) {
(holder as ProductHolder).bind("test");
}
class ProductHolder extends RecyclerView.ViewHolder {
public ProductHolder(View view) {
super(view);
}
public void bind(String test) {
}
}
}
public class HeaderDelegateAdapter implements ViewTypeDelegateAdapter {
private int resID;
private Context context;
public ProductDelegateAdapter(int resID, Context context) {
this.resID = resID;
this.context = context;
}
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent) {
return new HeaderHolder(LayoutInflater.from(parent.context).inflate(resID, parent, false));
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, ViewType item) {
(holder as HeaderHolder).bind("test");
}
class HeaderHolder extends RecyclerView.ViewHolder {
public HeaderHolder(View view) {
super(view);
}
public void bind(String test) {
}
}
}
public class AccAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private Context context;
private List<ViewType> items;
private SparseArrayCompat<ViewTypeDelegateAdapter> delegateAdapters;
private ViewType headerItem;
public AccAdapter(Context context) {
this.context = context;
this.items = new ArrayList();
this.delegateAdapters = new SparseArrayCompat();
this.headerItem = new ViewType() {
#Override
public int getViewType() {
return ViewTypes.HEADER;
}
};
this.items.add(this.headerItem);
this.delegateAdapters.put(ViewTypes.HEADER, HeaderDelegateAdapter(R.id.test, this.context));
this.delegateAdapters.put(ViewTypes.ITEM, ProductDelegateAdapter(R.id.test, this.context));
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, Int viewType) {
return delegateAdapters.get(viewType).onCreateViewHolder(parent);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, Int position) {
delegateAdapters.get(getItemViewType(position)).onBindViewHolder(holder, items[position])
}
#Override
public Int getItemViewType(Int position) {
return items.get(position).getViewType();
}
#Override
public Int getItemCount() {
return items.getSize();
}
public void add(ViewType viewType) {
val initPosition = this.items.size - 1
this.items.add(item)
notifyItemRangeChanged(initPosition, this.items.size + 1)
}
}
public class Event implements ViewType {
private String id;
#Override
public int getViewType() {
return ViewTypes.ITEM;
}
}
Excuse me for some syntax errors, I've translated to Java from Kotlin to help you. Hope it helps!