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When i retrive children from firebase using recylceview TextView Won't Show

I'm using Android Studio when I run my app and add or show RecycleView list, text view shows only the title not data inside firebase this is the textviewaddCateogryclass
What would be causing this?
used the same data on firebase child.
firebase realtime database
Firebase
ModelCategoryClass
public class ModelCategoryClass {
//same variable in db
String id, category, uid;
long timestamp;
public ModelCategoryClass() {}
public ModelCategoryClass(String id, String category, String uid, long timestamp) {
this.id = id;
this.category = category;
this.uid = uid;
this.timestamp = timestamp;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
}
AdapterCategoryClass
public class AdapterCategoryClass extends RecyclerView.Adapter<AdapterCategoryClass.HolderCategory> {
private Context context;
private ArrayList<ModelCategoryClass> categoryClassArrayList;
//xml rows_categorys
private RowsCategorysBinding binding;
//constucor
public AdapterCategoryClass(Context context, ArrayList<ModelCategoryClass> categoryClassArrayList) {
this.context = context;
this.categoryClassArrayList = categoryClassArrayList;
}
///////////////
//generated from RecyclerView.Adapter<AdapterCategoryClass.HolderCategory>
#NonNull
#Override
public HolderCategory onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//binding
binding = RowsCategorysBinding.inflate(LayoutInflater.from(context), parent, false);
return new HolderCategory(binding.getRoot());
//return new HolderCategory(RowsCategorysBinding.inflate(LayoutInflater.from(parent.getContext()),parent,false));
}
//getting data
#Override
public void onBindViewHolder(#NonNull HolderCategory holder, int position) {
ModelCategoryClass model = categoryClassArrayList.get(position);
String id = model.getId();
String category = model.getId();
String uid = model.getId();
long timestamp = model.getTimestamp();
//remove btn
//as we declred remove btn in HolderCatogory method
holder.removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(context,""+category,Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return categoryClassArrayList.size();
}
/////////////
//hold lists xml
public class HolderCategory extends RecyclerView.ViewHolder {
TextView textViewListCatt;
ImageButton removeBtn;
//constu
public HolderCategory(#NonNull View itemView) {
super(itemView);
textViewListCatt = binding.textViewListCat;
removeBtn = binding.removeBtn;
}
}
}
CategoryAddActivity class
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityCategoryAddBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
//init firebase auth
firebaseAuth = FirebaseAuth.getInstance();
ShowCategories();
private void ShowCategories() {
categoryClassArrayList = new ArrayList<>();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("Categories");
ref.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
//clear array befor add data
categoryClassArrayList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
//get data from child in database
ModelCategoryClass mod = dataSnapshot.getValue(ModelCategoryClass.class);
//add data to array
categoryClassArrayList.add(mod);
}
//start using adapter
adapterCategoryClass = new AdapterCategoryClass(CategoryAddActivity.this, categoryClassArrayList);
//get recycleListview rom xml and set it with defualt set method
binding.recycleList.setAdapter(adapterCategoryClass);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}

The following lines of code:
ModelCategoryClass model = categoryClassArrayList.get(position);
String id = model.getId();
String category = model.getId();
String uid = model.getId();
long timestamp = model.getTimestamp();
Should be changed to:
ModelCategoryClass model = categoryClassArrayList.get(position);
String id = model.getId();
String category = model.getCategory(); //👈
String uid = model.getUid(); //👈
long timestamp = model.getTimestamp();
Meaning that you need to call the corresponding getters. But that's not the entire problem. You aren't displaying something because you aren't setting those values to their corresponding views. To solve this, you have to create inside your HolderCategory class a method that actually binds the data to the views. For example, to set the category, you should use something like this:
void setCategory(String category) {
binding.textViewListCat.setText(category);
}
And then call this method from inside your onBindViewHolder method like this:
holder.setCategory(category);

change value of textview in a recyclerview item

guys I'm using multiple api request with the same response and displaying it into a recycling
view
but in those response I get a user_id instead of user name but I need to display the user name into the recyclerview
this image breaks down what i need to do : https://i.stack.imgur.com/IdQ6e.png
so this is my adapter class where I tried to make a hashmap using another api request and making a hashmap with <user_id,user_name> and trying to use it in the holder class to display the user name but it didn't work :
public class FollowupAdapter extends RecyclerView.Adapter {
Map<String, String> userMap1 = new HashMap<>();
private Context Context1 ;
private List<TraitementTicketModel> followuplist;
public FollowupAdapter(Context mContext, List<TraitementTicketModel> followuplist) {
this.Context1 = mContext;
this.followuplist = followuplist;
}
#Override
public int getItemViewType(int position) {
if(followuplist.get(position).getTaskcategories_id()!=null) {
return 3;
}else if (followuplist.get(position).getSolutiontypes_id()!=null){
return 2;
}
return 1;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view;
LayoutInflater layoutInflater=LayoutInflater.from(Context1);
if (viewType==1){
view = layoutInflater.inflate(R.layout.followupitem, parent,false);
return new ViewHolderFollowup(view);
}else if (viewType==2){
view = layoutInflater.inflate(R.layout.solutionitem, parent,false);
return new ViewHolderSolution(view);
}
else
view = layoutInflater.inflate(R.layout.taskitem, parent,false);
return new ViewHolderTask(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
displayusers();
if(followuplist.get(position).getTaskcategories_id()!=null) {
ViewHolderTask viewHolderTask = (ViewHolderTask) holder;
viewHolderTask.users_id.setText(userMap1.get(followuplist.get(position).getUsers_id()));
viewHolderTask.date.setText(followuplist.get(position).getDate());
viewHolderTask.content.setText(html2text(followuplist.get(position).getContent()));
}else if(followuplist.get(position).getSolutiontypes_id()!=null){
ViewHolderSolution viewHolderSolution = (ViewHolderSolution) holder;
viewHolderSolution.users_id.setText(userMap1.get(followuplist.get(position).getUsers_id()));
viewHolderSolution.date.setText(followuplist.get(position).getDate());
viewHolderSolution.content.setText(html2text(followuplist.get(position).getContent()));
}
else {
ViewHolderFollowup viewHolderFollowup = (ViewHolderFollowup) holder;
viewHolderFollowup.users_id.setText(userMap1.get(followuplist.get(position).getUsers_id()));
viewHolderFollowup.content.setText(html2text(followuplist.get(position).getContent()));
viewHolderFollowup.titre.setText(followuplist.get(position).getTitre());
viewHolderFollowup.date.setText(followuplist.get(position).getDate());
}
}
#Override
public int getItemCount() { return followuplist.size(); }
public static class ViewHolderFollowup extends RecyclerView.ViewHolder{
TextView users_id;
TextView date;
TextView content;
TextView titre;
public ViewHolderFollowup(#NonNull View itemView) {
super(itemView);
users_id=itemView.findViewById(R.id.user_id_followup);
date =itemView.findViewById(R.id.date_followup);
content=itemView.findViewById(R.id.contenu_followup);
titre=itemView.findViewById(R.id.titre_followup);
}
}
public static class ViewHolderTask extends RecyclerView.ViewHolder {
TextView users_id;
TextView date;
TextView content;
public ViewHolderTask(#NonNull View itemView) {
super(itemView);
users_id=itemView.findViewById(R.id.user_id_task);
date =itemView.findViewById(R.id.date_task);
content=itemView.findViewById(R.id.contenu_task);
}
}
public static class ViewHolderSolution extends RecyclerView.ViewHolder{
TextView users_id;
TextView date;
TextView content;
public ViewHolderSolution(#NonNull View itemView) {
super(itemView);
users_id=itemView.findViewById(R.id.user_id_solution);
date =itemView.findViewById(R.id.date_solution);
content=itemView.findViewById(R.id.contenu_solution);
}
}
public static String html2text(String html) {
return Jsoup.parse(Jsoup.parse(html).text()).text();
}
public List addToList(List<TraitementTicketModel> list) {
if(this.followuplist.addAll(list)){
Sort(followuplist);
}
notifyDataSetChanged();
return this.followuplist;
}
private List Sort (List<TraitementTicketModel> datalist){
Collections.sort(datalist, new Comparator<TraitementTicketModel>() {
#Override
public int compare(TraitementTicketModel o1, TraitementTicketModel o2) {
return o2.getDate().compareTo(o1.getDate());
}
});
return datalist;
}
private void displayusers() {
SharedPreferences sp =Context1.getApplicationContext().getSharedPreferences("tokenPref", Context.MODE_PRIVATE);
String sestoken = sp.getString("token","");
Retrofit retrofit= RetrofitInstance.getRetrofitInstance();
final Api api= retrofit.create(Api.class);
Call<List<User>> call = api.getUser(sestoken);
call.enqueue(new Callback<List<User>>() {
#Override
public void onResponse(Call<List<User>> call, Response<List<User>> response) {
if (response.code() != 200){
Log.e("TAG", "onResponse: something is wrong"+response.code() );
}
List<User> users = response.body();
for (User user : users) {
if (userMap.get(user.getId()) == null)
userMap.put(user.getId(), user.getName());
}
}
#Override
public void onFailure(Call<List<User>> call, Throwable t) {
}
});
}
private Map<String, String> PutMap(HashMap<String, String> userMap) {
userMap1=userMap;
return userMap1;
}
}
this hashmap I tried didn't work appreciate any solution or idea I'm really stuck in this

Your adapter's job is to adapt a data model into a series of view holders, not to transform, combine, fetch, mutate, etc. a different series of data coming from different sources.
Ask yourself this question: if you could "magically" call an object like this repository.getList() that would return a List of Something and that Something had three fields:
class Something {
String id;
String userName;
String content;
String type; //maybe useful for the Adapter to pick what type...
... anything else you need
}
So you have a List<Something>() that you can pass to your adapter, wouldn't your adapter suddenly be super simple?
That's what you need to do; remove all the logic that does not belong in the adapter (I expect only to have a onCreateViewHolder onBindViewHolder getItemViewType and that's it).
You're making a big problem into your adapter, which already has a lot of other responsibilities to carry. This data problem (putting the user + id + content) in a single object is a problem of your data source/repository, and not the adapter of a recycler view.
Transform your data before you pass it to your adapter. Your life, your fellow developers, and the future you, will be grateful.

Having problem to fetching file from firestore recycle view [duplicate]

This question already has an answer here:
Firebase Android ListView not being displayed
(1 answer)
Closed 1 year ago.
I am an android developer beginner, I am having a problem fetch files from firestore recycle view in the main activity but I can fetch files from fragments.
This is my main activity
public class FoodInfoActivity extends AppCompatActivity {
RecyclerView recyclerView1,recyclerView2;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference notebookRef;
private NoteAdapter adapter;
FirebaseAuth fAuth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_food_info);
fAuth = FirebaseAuth.getInstance();
setUpRecyclerView();
}
private void setUpRecyclerView() {
notebookRef = db.collection("FoodInside");
Query query = notebookRef;
FirestoreRecyclerOptions<FoodAdapter> options = new FirestoreRecyclerOptions.Builder<FoodAdapter>()
.setQuery(query, FoodAdapter.class)
.build();
adapter = new NoteAdapter(options);
RecyclerView recyclerView = findViewById(R.id.fi);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
}
This is my Note adapter where i use model class to fetch file
public class NoteAdapter extends FirestoreRecyclerAdapter<FoodAdapter, NoteAdapter.NoteHolder> {
public NoteAdapter(#NonNull FirestoreRecyclerOptions<FoodAdapter> options) {
super(options);
}
#Override
protected void onBindViewHolder(#NonNull NoteHolder holder, int position, #NonNull FoodAdapter foodAdapter) {
holder.textViewTitle.setText(foodAdapter.getRestaurant());
holder.textViewDescription.setText(foodAdapter.getItem());
holder.textViewPriority.setText(String.valueOf(foodAdapter.getPrice()));
}
#NonNull
#Override
public NoteHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_recycle_layout,
parent, false);
return new NoteHolder(v);
}
class NoteHolder extends RecyclerView.ViewHolder {
TextView textViewTitle;
TextView textViewDescription;
TextView textViewPriority;
public NoteHolder(View itemView) {
super(itemView);
textViewTitle = itemView.findViewById(R.id.textView95a);
textViewDescription = itemView.findViewById(R.id.textView123a);
textViewPriority = itemView.findViewById(R.id.textView124a);
}
}
}
This is my adapter class ,
public class FoodAdapter {
String Restaurant;
String Item;
String Price;
String item_id;
public FoodAdapter() {
}
public FoodAdapter(String restaurant, String item, String price,String item_id) {
Restaurant = restaurant;
Item = item;
Price = price;
this.item_id = item_id;
}
public String getRestaurant() {
return Restaurant;
}
public void setRestaurant(String restaurant) {
Restaurant = restaurant;
}
public String getItem() {
return Item;
}
public void setItem(String item) {
Item = item;
}
public String getPrice() {
return Price;
}
public void setPrice(String price) {
Price = price;
}
public String getItem_id() {
return item_id;
}
public void setItem_id(String item_id) {
this.item_id = item_id;
}
}
Why it is not working in main activity but work fragment. I am just afraid. and tired...working on the project. so need solution of this problem

#Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
Add this line to main activity.

How to get details when clicking on an item in a RecyclerView?

I am trying to get the details of the Recipe from which Recipe I have clicked in recycler view. I am using this to go to an edit/delete feature. Here is the code for my main activity.
The details that I am trying to get is getting the Name, Ingredients and method.
public class MainActivity extends AppCompatActivity implements RecipeListAdapter.OnItemClickListener {
private RecipeViewModel mRecipeViewModel;
public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;
public String Name;
public String Ingredients;
public String Method;
private RecipeListAdapter mAdapter;
private RecipeDao recDao;
private LiveData<List<Recipe>> RecipeList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = findViewById(R.id.recyclerview);
final RecipeListAdapter adapter = new RecipeListAdapter(this);
recyclerView.setAdapter(adapter);
adapter.setOnItemClickListener(MainActivity.this);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecipeViewModel = new ViewModelProvider(this).get(RecipeViewModel.class);
mRecipeViewModel.getAllRecipes().observe(this, new Observer<List<Recipe>>() {
#Override
public void onChanged(#Nullable final List<Recipe> recipes) {
// Update the cached copy of the words in the adapter.
adapter.setWords(recipes);
}
});
void onItemClick(int position) {
//Delete Below test to pass data through
Recipe recipe = new Recipe("Test", "Yeet", "Jim");
// showAlertDialogBox();
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("Edit or Delete...");
alertDialog.setPositiveButton("Edit", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent update = new Intent(MainActivity.this, UpdateRecipeActivity.class);
update.putExtra("Name", recipe.getName());
update.putExtra("Ingredients", recipe.getIngredients());
update.putExtra("Method", recipe.getMethod());
startActivity(update);
}
});
alertDialog.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
//Delete
}
});
alertDialog.show();
}
Here is the Recipe.class if you needed it!
#Entity(tableName = "recipe_table")
public class Recipe {
#PrimaryKey(autoGenerate = true)
#ColumnInfo(name= "recipeId")
private int RecipeId;
private String name;
private String Ingredients;
private String Method;
#Ignore
public Recipe(String name, String Ingredients, String Method) {
this.RecipeId = RecipeId;
this.name = name;
this.Ingredients = Ingredients;
this.Method = Method;
}
public Recipe(String name) {
this.name = name;
}
public void changeText1(String text){
name = text;
}
//Add Image somehow!
public int getRecipeId() {
return RecipeId;
}
public void setRecipeId(int recipeId) {
RecipeId = recipeId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMethod() {
return Method;
}
public void setMethod(String method) {
Method = method;
}
public String getIngredients() {
return Ingredients;
}
public void setIngredients(String ingredients) {
Ingredients = ingredients;
}
}
If you need anymore files, these are the files I have:
- RecipeListAdapter
- RecipeDao
- RecipeRepository
- RecipeRoomDatabase
- RecipeViewModel
Recipe Adapter code
public class RecipeListAdapter extends RecyclerView.Adapter {
private OnItemClickListener mListener;
private List recipeList;
public interface OnItemClickListener{
void onItemClick(int position, Recipe recipe);
}
public void setOnItemClickListener(OnItemClickListener listener){
mListener = listener;
}
class RecipeViewHolder extends RecyclerView.ViewHolder {
private final TextView recipeItemView;
private RecipeViewHolder(View itemView) {
super(itemView);
recipeItemView = itemView.findViewById(R.id.textView);
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if (mListener != null){
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION){
mListener.onItemClick(position,
recipeList.get(getAdapterPosition()));
}
}
}
});
}
}
private final LayoutInflater mInflater;
private List<Recipe> mRecipes; // Cached copy of words
RecipeListAdapter(Context context) {
mInflater = LayoutInflater.from(context);
this.recipeList = recipeList;
}
#Override
public RecipeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = mInflater.inflate(R.layout.recyclerview_item, parent,
false);
return new RecipeViewHolder(itemView);
}
#Override
public void onBindViewHolder(RecipeViewHolder holder, int position) {
if (mRecipes != null) {
Recipe current = mRecipes.get(position);
holder.recipeItemView.setText(current.getName());
} else {
// Covers the case of data not being ready yet.
holder.recipeItemView.setText("No Recipes");
}
}
void setWords(List<Recipe> recipes){
mRecipes = recipes;
notifyDataSetChanged();
}
// getItemCount() is called many times, and when it is first called,
// mWords has not been updated (means initially, it's null, and we can't
return null).
#Override
public int getItemCount() {
if (mRecipes != null)
return mRecipes.size();
else return 0;
}
public interface OnNoteListener{}
}

Inside the onItemClick there is one more parameter need to add.
void onItemClick(int position, Recipe recipe) {
//Delete selected recipe from recipe list
arrayList.remove(recipe)
}
The onItemClick method will get called from adapter, from there you have to pass the selected receipe. In the adapter you have to use recipeList.get(getAdapterPosition()) to get the clicked receipe and pass this to the interface method, onItemClick along with the position.
So your code will look like this way inside the adapter,
itemClickListener.onItemClick(position,
recipeList.get(getAdapterPosition()))
Just as a note, please ensure instead of List, you need to take ArrayList to perform remove operation.

Firebase UI 3.0.0: Retrieve data to recycle view

Can anyone help me to retrieve data from the node "foods" and put it in the RecyclerView. These are the file I've been working on but it turns out to be an empty list. I have viewed a tutorial on Internet but most of them were with an older version of Firebase. Recently, Firebase UI has been updated and the data binding process has changed to their new FirebaseRecyclerAdapter structure
This is my database structure:
"foods" : {
"AntipastoSalad" : {
"duration" : "30",
"img" : "https://firebasestorage.googleapis.com/v0/b/mealplanner-ec8ca.appspot.com/o/res%2Fsalad.jpg?alt=media&token=257d4392-8a1f-4fb7-84b5-b63abb4643f4",
"name" : "Antipasto salad",
"type" : "Salad"
},
This is my activity:
private RecyclerView mRecycleView;
private Query query;
private FirebaseRecyclerOptions<Meal> options;
private DatabaseReference mDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_food_list_row);
mDatabase = FirebaseDatabase.getInstance().getReference().child("foods");
//Recycle View
mRecycleView = (RecyclerView) findViewById(R.id.meal_items);
mRecycleView.setHasFixedSize(true);
mRecycleView.setLayoutManager(new LinearLayoutManager(this));
}
#Override
protected void onStart() {
super.onStart();
query = FirebaseDatabase.getInstance().getReferenceFromUrl("https://mealplanner-ec8ca.firebaseio.com/foods/AntipastoSalad");
options = new FirebaseRecyclerOptions.Builder<Meal>()
.setQuery(query, Meal.class)
.build();
FirebaseRecyclerAdapter<Meal, FoodListRowActivity.MealRowHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Meal, FoodListRowActivity.MealRowHolder>(
options) {
#Override
public FoodListRowActivity.MealRowHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_row, parent, false);
return new FoodListRowActivity.MealRowHolder(v);
}
#Override
protected void onBindViewHolder(FoodListRowActivity.MealRowHolder holder, int position, Meal current) {
holder.setTitle(current.getName());
String duration = current.getDuration() + "min";
holder.setDuration(duration);
}
};
//Populate Item into Adapter
mRecycleView.setAdapter(firebaseRecyclerAdapter);
mRecycleView.addOnItemTouchListener(new RecycleViewItemClickListener(this, mRecycleView, new RecycleViewItemClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
Intent viewMeal = new Intent(FoodListRowActivity.this, CookingInstructionActivity.class);
startActivity(viewMeal);
}
#Override
public void onLongItemClick(View view, int position) {
//TODO: DELETE
}
}));
}
public static class MealRowHolder extends RecyclerView.ViewHolder {
View mView;
public MealRowHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title) {
TextView foodTitle = (TextView) mView.findViewById(R.id.list_item_foodList_name);
foodTitle.setText(title);
}
public void setDuration(String title) {
TextView foodDuration = (TextView) mView.findViewById(R.id.list_item_foodList_calories);
foodDuration.setText(title);
}
}
}
and class structure:
public class Meal{
private String img;
private String duration;
private String name;
private String instruction;
public Meal(){
}
public Meal (String img, String duration, String name, String instruction){
this.img = img;
this.name = name;
this.duration = duration;
this.instruction = instruction;
}
public void update(String duration, String name, String instruction)
{
this.name = name;
this.duration = duration;
this.instruction = instruction;
}
public String getName(){
return name;
}
public String getDuration() {
return duration;
}
public String getInstruction() {
return instruction;
}
public String getImg(){return img;}

The query specified in the setQuery() method should be a reference to the root of the list you want to show in the RecyclerView, so like this:
query = FirebaseDatabase.getInstance().getReference().child("foods");
You also need to call startListening() on the adapter to instruct it to start retrieving data from the database.
From the FirebaseRecyclerAdapter lifecycle documentation:
The FirebaseRecyclerAdapter uses an event listener to monitor changes to the Firebase query. To begin listening for data, call the startListening() method. You may want to call this in your onStart() method. Make sure you have finished any authentication necessary to read the data before calling startListening() or your query will fail.
#Override protected void onStart() {
super.onStart();
adapter.startListening();
}
Similarly, the stopListening() call removes the event listener and all data in the adapter. Call this method when the containing Activity or Fragment stops:
#Override protected void onStop() {
super.onStop();
adapter.stopListening();
}

Please override getItemCount() method of FirebaseRecyclerAdapter.
#Override
public int getItemCount() {
return 1;
}
Reference.

This is how I'm retrieving my data in recyclerview using Firebase UI:
private FirebaseRecyclerAdapter<TaskPOJO, TaskViewHolder> adapter;
private void loadTasks() {
database = FirebaseDatabase.getInstance();
tasks = database.getReference("Tasks");
adapter = new FirebaseRecyclerAdapter<TaskPOJO, TaskViewHolder>(TaskPOJO.class, R.layout.task_item, TaskViewHolder.class, tasks) {
#Override
protected void populateViewHolder(TaskViewHolder viewHolder, final TaskPOJO model, int position) {
Log.wtf("valueTEst", "populateViewHolder: "+model.toString() );
Log.wtf("TEstScript1", "populateViewHolder: "+model.getTitle() );
viewHolder.title.setText(model.getTitle());
viewHolder.desc.setText(model.getDescripttion()+"\n");
viewHolder.remaining.setText(model.getRemaining()+"/"+model.getPoint());
viewHolder.points.setText("Points "+model.getRemaining());
Glide.with(viewHolder.title.getContext())
.load(model.getImage())
.into(viewHolder.image);
viewHolder.setClickListener(new ItemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
Toast.makeText(getActivity(), "" /*+ model.getTitle()*/, Toast.LENGTH_SHORT).show();
Intent TaskPOJODetail = new Intent(getActivity(), Main.class);
TaskPOJODetail.putExtra("value","detail");
TaskPOJODetail.putExtra("taskId",adapter.getRef(position).getKey());
startActivity(TaskPOJODetail);
}
});
}
};
progressBar.setVisibility(View.GONE);
recyclerViewTasks.setAdapter(adapter);
}
this is my firebase structure :
hope this will help you.