I've a RecyclerView populated by an ArrayList of custom objects. I've implemented Comparable interface to sort items in array list based on index. Sorting gives me the desired results but when i populate RecyclerView, my items appear in the order they were in before sorting.
I'm calling Collection.sort(arrayList) in the constructor of Adaper like this:
public MyRecyclerViewListAdapter(List<Something> somethings, OnStartDragListener mDragStartListener) {
this.mDragStartListener = mDragStartListener;
this.somethings = somethings;
Collections.sort(this.somethings);
}
Even I sorted the list before sending it in as an argument to the constructor:
Collections.sort(this.somethings);
myRecyclerViewListAdapter = new myRecyclerViewListAdapter(somethings, this);
My Adapter code:
public class DefaultCurrenciesAdapter extends RecyclerView.Adapter<DefaultCurrenciesAdapter.MyViewHolder> implements ItemTouchHelperAdapter{
private List<Currency> currencies;
DataManager dataManager = new DataManager();
private OnStartDragListener mDragStartListener;
public DefaultCurrenciesAdapter(List<Currency> currencies, OnStartDragListener mDragStartListener) {
this.mDragStartListener = mDragStartListener;
this.currencies = currencies;
Collections.sort(this.currencies);
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View currencyView = inflater.inflate(R.layout.currency_list,parent,false);
MyViewHolder viewHolder = new MyViewHolder(currencyView);
return viewHolder;
}
//populate data
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Currency currency = currencies.get(position);
TextView tvCurrencyValue = holder.tvCurrencyValue;
TextView tvCurrencyName=holder.tvCurrencyName;
tvCurrencyName.setText(currencies.get(position).getCode() + " - " + currencies.get(position).getName());
TextView tvUnitValue = holder.tvUnitValue;
tvUnitValue.setText("1 " + currencies.get(position).getCode()+ " = " +Double.toString(round(currencies.get(position).getRate()/ Currency.getBaseCurrencyRate(),2)) +" "+ Currency.getBaseCurrencyCode());
holder.ivFlag.setImageResource(App.getmContext().getResources().getIdentifier("drawable/"+currencies.get(position).getCountryCode().toLowerCase(),null,App.getmContext().getPackageName()));
}
#Override
public int getItemCount() {
return currencies.size();
}
#Override
public boolean onItemMove(int fromPosition, int toPosition) {
Collections.swap(currencies, fromPosition, toPosition);
int tempSort = currencies.get(fromPosition).getSortOrder();
dataManager.setSortOrder(currencies.get(fromPosition).getCode(), currencies.get(toPosition).getSortOrder());
dataManager.setSortOrder(currencies.get(toPosition).getCode(), tempSort);
notifyItemMoved(fromPosition, toPosition);
return true;
}
#Override
public void onItemDismiss(int position) {
dataManager.removeDefaultCurrency(currencies.get(position).getCode());
currencies.remove(position);
notifyItemRemoved(position);
}
public static class MyViewHolder extends RecyclerView.ViewHolder implements ItemTouchHelperViewHolder,View.OnClickListener{
public TextView tvCurrencyValue;
public TextView tvCurrencyDecimals;
public TextView tvCurrencyName;
public TextView tvUnitValue;
public ImageView ivFlag;
public MyViewHolder(View itemView) {
super(itemView);
tvCurrencyValue = (TextView) itemView.findViewById(R.id.tvCurrencyValue);
tvCurrencyDecimals = (TextView) itemView.findViewById(R.id.tvCurrencyValueDecimals);
tvCurrencyName = (TextView)itemView.findViewById(R.id.tvCurrencyExp);
tvUnitValue = (TextView)itemView.findViewById(R.id.tvUnitValue);
ivFlag = (ImageView)itemView.findViewById(R.id.ivFlag);
Typeface fontMontserratSemiBold = Typeface.createFromAsset(App.getmContext().getAssets(), "fonts/Montserrat-SemiBold.otf");
Typeface fontMontserratRegular = Typeface.createFromAsset(App.getmContext().getAssets(), "fonts/Montserrat-Regular.otf");
tvCurrencyValue.setTypeface(fontMontserratSemiBold);
tvCurrencyDecimals.setTypeface(fontMontserratSemiBold);
tvCurrencyName.setTypeface(fontMontserratRegular);
tvUnitValue.setTypeface(fontMontserratRegular);
}
#Override
public void onItemSelected() {
}
#Override
public void onItemClear() {
itemView.setBackgroundColor(0);
}
#Override
public void onClick(View view) {
}
}
}
`
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 a RecyclerView filled with elements of the "Event" class. The class has parameters such as Date and Importance.
Now all Events in RecyclerView are displayed just like that.
I want to show Events by Date separately and also want to show Events by importance separately. I'll attach a picture to show what I mean.
I read that to do separation, for example, by dates, you need to make a separate adapter and viewholder. Question - if I want to split the same data array by importance, do I need to create another adapter?
And let's say I want to choose a grouping method. How can I do this and where?
My First RecyclerViewAdapter of Event
public class EventAdapter extends RecyclerView.Adapter<EventAdapter.EventViewHolder> {
private static final String TAG = "myLogs";
private List<Event> mEventList;
final SparseBooleanArray selectedItems = new SparseBooleanArray();
private int currentSelectedPos;
public List<Event> getEvents(){
return mEventList;
}
private EventAdapterListener itemClickListener;
public interface EventAdapterListener {
void onItemClick(int position);
void onItemLongClick(int position);
}
public void setListener(EventAdapterListener listener){
itemClickListener = listener;
}
private OnItemCheckedListener OnItemChecked;
public interface OnItemCheckedListener {
void onItemChecked(int position, boolean isImportant);
}
public void setOnItemCheckedListener (OnItemCheckedListener listener){
OnItemChecked = listener;
}
public static class EventViewHolder extends RecyclerView.ViewHolder{
public TextView TVtitle;
public TextView TVcomment;
public CheckBox CBimportance;
public TextView TVdate;
//public EventViewHolder(#NonNull View itemView, final EventAdapterListener listener) {
public EventViewHolder(#NonNull View itemView) {
super(itemView);
TVtitle = itemView.findViewById(R.id.tvTitle);
TVcomment = itemView.findViewById(R.id.tvComment);
CBimportance = itemView.findViewById(R.id.cbIconImportant);
TVdate = itemView.findViewById(R.id.tvDate);
}
}
public void removeItem(int position) {
mEventList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, mEventList.size());
}
private static DateFormatSymbols myDateFormatSymbols = new DateFormatSymbols(){
#Override
public String[] getMonths() {
return new String[]{"января", "февраля", "марта", "апреля", "мая", "июня",
"июля", "августа", "сентября", "октября", "ноября", "декабря"};
}
};
public EventAdapter(ArrayList<Event> listEvent){
mEventList = listEvent;
}
#NonNull
#Override
public EventViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_cardview, parent, false);
//LayoutInflater inflater = LayoutInflater.from(parent.getContext());
//if (viewType == Constants.VIEWTYPE_GROUP){
//ViewGroup group = (ViewGroup) inflater.inflate(R.layout.group_layout, parent, false);
//GroupViewHolder
//}
return new EventViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull EventViewHolder holder, final int position) {
final Event item = mEventList.get(position);
holder.TVtitle.setText(item.getName());
holder.TVcomment.setText(item.getComment());
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd MMMM", myDateFormatSymbols);
holder.TVdate.setText(simpleDateFormat.format(item.getDate()));
holder.CBimportance.setOnCheckedChangeListener(null);
holder.CBimportance.setChecked(item.getImportant());
holder.CBimportance.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
item.IsImportant = b;
OnItemChecked.onItemChecked(position, b);
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (selectedItems.size() > 0 && itemClickListener != null){
itemClickListener.onItemClick(position);
}
}
});
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(View view) {
if (itemClickListener != null){
itemClickListener.onItemLongClick(position);
}
return true;
}
});
if (currentSelectedPos == position) currentSelectedPos = -1;
}
#Override
public int getItemCount() {
return mEventList.size();
}
void deleteEvents(){
List<Event> events = new ArrayList<>();
for (Event event : mEventList){
if (event.getSelected())
events.add(event);
}
mEventList.removeAll(events);
notifyDataSetChanged();
currentSelectedPos = -1;
}
void toggleSelection(int position) {
currentSelectedPos = position;
if (selectedItems.get(position)) {
selectedItems.delete(position);
mEventList.get(position).setSelected(false);
} else {
selectedItems.put(position, true);
mEventList.get(position).setSelected(true);
}
notifyItemChanged(position);
}}
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!
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!
I have some items in my adapter but nothing is shown in the RecyclerView.
Adapter
public class WorkOrderAdapter extends RecyclerView.Adapter<WorkOrderViewHolder> {
private List<WorkOrder> orders = new LinkedList<>();
public void setData(List<WorkOrder> orders) {
this.orders = orders;
}
#Override
public WorkOrderViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_workorder, parent, false);
return new WorkOrderViewHolder(view);
}
#Override
public void onBindViewHolder(WorkOrderViewHolder holder, int position) {
WorkOrder order = orders.get(position);
holder.bind(order);
}
#Override
public int getItemCount() {
return orders.size();
}
}
ViewHolder
public class WorkOrderViewHolder extends RecyclerView.ViewHolder {
private TextView title;
private TextView description;
private TextView date;
public WorkOrderViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title_textview);
description = (TextView) view.findViewById(R.id.description_textview);
date = (TextView) view.findViewById(R.id.date_textview);
}
public void bind(WorkOrder order) {
title.setText("Test");
description.setText("Test");
date.setText("Test");
}
}
Activity (Using AndroidAnnotations)
#EActivity(R.layout.activity_workorders)
#OptionsMenu(R.menu.activity_workorders)
public class WorkOrdersActivity extends ToolbarActivity {
#ViewById(R.id.orders_recyclerview)
RecyclerView ordersList;
List<WorkOrder> orders = new LinkedList<>();
private WorkOrderAdapter adapter;
{
adapter = new WorkOrderAdapter();
orders.add(new WorkOrder());
orders.add(new WorkOrder());
orders.add(new WorkOrder());
adapter.setData(orders);
}
#AfterViews
public void initViews() {
ordersList.setAdapter(adapter);
}
}
Please add the LayoutManager to the RecyclerView and try again
ordersList.setLayoutManager(new LinearLayoutManager(this));
ordersList.setAdapter(adapter);