Я уже посмотрел некоторую информацию о RecyclerAdapter, но т.к к сожалению большинство источников англоязычные и некоторые аспекты я и переводчик не понимаем. Итак, вот моя база данных

RecyclerAdapter классы в нем:
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
View view = inflater.inflate(R.layout.coupon,parent,false);
return new ViewHolder(view);
OnBindViewHoder
public void onBindViewHolder(ViewHolder viewHolder, int position) {
Coupons coupons = coupons2.get(position);
viewHolder.imageView.setImageResource(coupons.getLogo());
viewHolder.nameView.setText(coupons.getName());
viewHolder.sumView.setText(coupons.getSum());
}
getItemCount
public int getItemCount(){
return coupons2.size();
}
static class ViewHolder extends RecyclerView.ViewHolder{
final ImageView imageView;
final TextView nameView,sumView;
ViewHolder(View v){
super(v);
imageView = (ImageView) v.findViewById(R.id.logo);
nameView = (TextView) v.findViewById(R.id.name);
sumView = (TextView)v.findViewById(R.id.sum);
}
All RecyclerAdapter.java:
class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private LayoutInflater inflater;
private List<Coupons> coupons2;
RecyclerAdapter(Context context, List<Coupons> coupons2){
this.coupons2 = coupons2;
this.inflater = LayoutInflater.from(context);
}
@Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
View view = inflater.inflate(R.layout.coupon,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
Coupons coupons = coupons2.get(position);
viewHolder.imageView.setImageResource(coupons.getLogo());
viewHolder.nameView.setText(coupons.getName());
viewHolder.sumView.setText(coupons.getSum());
}
@Override
public int getItemCount(){
return coupons2.size();
}
static class ViewHolder extends RecyclerView.ViewHolder{
final ImageView imageView;
final TextView nameView,sumView;
ViewHolder(View v){
super(v);
imageView = (ImageView) v.findViewById(R.id.logo);
nameView = (TextView) v.findViewById(R.id.name);
sumView = (TextView)v.findViewById(R.id.sum);
}
}
LibraryActivity classes in it:
onCreate:
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_library);
setInitialData();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.list);
RecyclerAdapter adapter = new RecyclerAdapter(this,couponss);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
Query query = rootRef.child("Сoupons");
FirebaseRecyclerOptions<Coupons> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<Coupons>()
.setQuery(query, Coupons.class)
.build();
All LibraryActivity.java:
List<Coupons> couponss = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_library);
setInitialData();
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.list);
RecyclerAdapter adapter = new RecyclerAdapter(this,couponss);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
Query query = rootRef.child("Сoupons");
FirebaseRecyclerOptions<Coupons> firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<Coupons>()
.setQuery(query, Coupons.class)
.build();
}
private void setInitialData(){
couponss.add(new Coupons("Лента","-500",R.drawable.aaaaaaaaaaa));
}
All Coupons.java:
public class Coupons {
private String name;
private int logo;
private String sum;
public Coupons(String name, String sum, int logo) {
this.name = name;
this.sum = sum;
this.logo = logo;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getSum(){
return this.sum;
}
public void setSum(String sum){
this.sum = sum;
}
public int getLogo(){
return this.logo;
}
public void setLogo(int logo){
this.logo = logo;
}
@Exclude
public Map<String, Object> toMap() {
HashMap<String, Object> result = new HashMap<>();
result.put("name", name);
result.put("sum", sum);
result.put("logo", logo);
return result;
}
Где я допустил ошибку?