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Deletion of Node is not working in Firebase Realtime Database in Android Java

I am making an application in which products are inserted into the database and I am inserting the 1 product once. it is working fine. But when I delete a specific node/ product from Database. deletion code is also working fine but at the same time product is again adding into the database.
Main Fragment Code;
public class Products_fragment extends Fragment {
FloatingActionButton fab_addproduct;
RecyclerView recyclerView;
EditText searchview;
BottomSheetDialog bottomSheetDialog;
FirebaseDatabase firebaseDatabase;
ArrayList<Product_model> DatabaseProductlist;
FirebaseAuth auth;
CircularDotsLoader ProgressBar;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_products_fragment, container, false);
setviews(view);
setInitilization();
setclicks();
setadapter();
return view;
}
private void setInitilization() {
DatabaseProductlist = new ArrayList<>();
}
private void setadapter() {
FirebaseDatabase database = FirebaseDatabase.getInstance();
FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();
assert currentFirebaseUser != null;
String UID = currentFirebaseUser.getUid();
DatabaseReference reference = database.getReference("Users").child(UID).child("Products");
reference.addListenerForSingleValueEvent(new ValueEventListener() {
#SuppressLint("NotifyDataSetChanged")
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
ProgressBar.setVisibility(View.GONE);
DatabaseProductlist.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
Product_model model = dataSnapshot.getValue(Product_model.class);
DatabaseProductlist.add(model);
}
Product_Adapter product_adapter = new Product_Adapter(DatabaseProductlist);
recyclerView.setAdapter(product_adapter);
product_adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
ToastUtility.showErrorToast(getContext(), error.getMessage());
}
});
}
private void setclicks() {
fab_addproduct.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
bottomSheetDialog = new BottomSheetDialog(getContext(), R.style.AppBottomSheetDialogTheme);
bottomSheetDialog.setContentView(R.layout.productadd_bottom_sheet);
TextInputEditText product_id = bottomSheetDialog.findViewById(R.id.product_id);
TextInputEditText product_name = bottomSheetDialog.findViewById(R.id.product_name);
TextInputEditText product_quantity = bottomSheetDialog.findViewById(R.id.product_quantity);
MaterialButton add_btn = bottomSheetDialog.findViewById(R.id.add_btn);
TextInputEditText product_price = bottomSheetDialog.findViewById(R.id.product_price);
add_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (Objects.requireNonNull(product_name.getText()).toString().isEmpty() || product_id.getText().toString().isEmpty() || product_price.getText().toString().isEmpty() || product_quantity.getText().toString().isEmpty()) {
ToastUtility.showErrorToast(getContext(), "Please Fill all Fields");
} else {
Product_model model = new Product_model(Integer.parseInt(product_id.getText().toString()), Integer.parseInt(product_quantity.getText().toString()), Integer.parseInt(product_price.getText().toString()), product_name.getText().toString());
firebaseDatabase = FirebaseDatabase.getInstance();
DatabaseReference reference = firebaseDatabase.getReference("Users");
FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();
assert currentFirebaseUser != null;
String UID = currentFirebaseUser.getUid();
reference.child(UID).child("Products").addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
if (snapshot.child(product_name.getText().toString().trim()).exists()) {
ToastUtility.showErrorToast(getContext(),"Product Already Exists!");
}
else{
reference.child(UID).child("Products").child(product_name.getText().toString().trim()).setValue(model).addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if(task.isSuccessful()){
ToastUtility.showSuccessToast(getContext(),"Successfully Added");
setadapter();
}
else{
ToastUtility.showErrorToast(getContext(), Objects.requireNonNull(task.getException()).getMessage());
}
}
});
}
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
ToastUtility.showErrorToast(getContext(),error.getMessage());
}
});
}
}
});
bottomSheetDialog.show();
}
});
}
private void setviews(View view) {
recyclerView = view.findViewById(R.id.recyclerView);
fab_addproduct = view.findViewById(R.id.fab_addproduct);
searchview = view.findViewById(R.id.searchview);
ProgressBar = view.findViewById(R.id.progressbar);
}
}
Adapter Code:
public class Product_Adapter extends RecyclerView.Adapter<Product_Adapter.myviewholder> {
ArrayList<Product_model> dataholder;
public Product_Adapter(ArrayList<Product_model> dataholder) {
this.dataholder = dataholder;
}
#NonNull
#Override
public myviewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.singlerow_product, parent, false);
return new myviewholder(view); }
#SuppressLint("SetTextI18n")
#Override
public void onBindViewHolder(#NonNull myviewholder holder, int position) {
holder.idtv.setText("" + dataholder.get(position).getId());
holder.pnametv.setText("" + dataholder.get(position).getProduct_name());
holder.pqtytv.setText("" + dataholder.get(position).getProduct_quantity());
holder.ppritv.setText("" + dataholder.get(position).getProduct_price());
holder.delimg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FirebaseDatabase db = FirebaseDatabase.getInstance();
FirebaseUser curUser = FirebaseAuth.getInstance().getCurrentUser();
assert curUser != null;
String UID = curUser.getUid();
String productname = dataholder.get(holder.getAdapterPosition()).getProduct_name();
DatabaseReference reference = db.getReference("Users").child(UID).child("Products");
reference.child(productname).setValue(null).addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if(task.isSuccessful())
{
ToastUtility.showSuccessToast(view.getContext(),"Suucessfully Deleted");
notifyItemRemoved(holder.getAdapterPosition());
}
else
{
ToastUtility.showErrorToast(view.getContext(),"Product is not deleting ");
}
}
});
}
});
}
#Override
public int getItemCount() {
return dataholder.size();
}
static class myviewholder extends RecyclerView.ViewHolder{
TextView idtv, pnametv, pqtytv, ppritv, delimg, edit_img;
public myviewholder(#NonNull View itemView) {
super(itemView);
idtv = itemView.findViewById(R.id.idtv);
pnametv = itemView.findViewById(R.id.pnametv);
pqtytv = itemView.findViewById(R.id.pqtytv);
ppritv = itemView.findViewById(R.id.ppritv);
delimg = itemView.findViewById(R.id.delimg);
edit_img = itemView.findViewById(R.id.edit_img);
}
}
}

When you click delete, shouldn't you remove your item from the list before notifying data changed:
//this code belongs to the part where you click the delete
.........
reference.child(productname).setValue(null).addOnCompleteListener(new OnCompleteListener<Void>() {
#Override
public void onComplete(#NonNull Task<Void> task) {
if(task.isSuccessful())
{
ToastUtility.showSuccessToast(view.getContext(),"Suucessfully Deleted");
//here remove the item from your list
dataholder.remove(holder.getAdapterPosition());
//then notify the adapter
notifyItemRemoved(holder.getAdapterPosition());
}

I want to get the qna list through firebase, but I can't get the list

This is a list of qna in the firebase. I want to print this out.
But my output list doesn't show anything.
https://i.stack.imgur.com/6ctRB.png
QNA Activity
public class QnaActivity extends AppCompatActivity {
private RecyclerView qnaRv;
private ArrayList<ModelQna> qnaList;
private AdapterQna adapterQna;
private ImageButton writeBtn;
private ImageButton backbtn;
private TextView tabQnaTv;
private RelativeLayout QnaRl;
private FirebaseAuth firebaseAuth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qna);
getSupportActionBar().hide();
qnaRv = findViewById(R.id.qnaRv);
tabQnaTv = findViewById(R.id.tabQnaTv);
QnaRl = findViewById(R.id.QnaRl);
backbtn = findViewById(R.id.backBtn);
writeBtn = findViewById(R.id.writeBtn);
firebaseAuth = FirebaseAuth.getInstance();
loadAllQna();
showQnaUI();
backbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});
writeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), AddQnaActivity.class);
startActivity(intent);
}
});
tabQnaTv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//load products
}
});
}
private void loadAllQna() {
qnaList = new ArrayList<>();
adapterQna = new AdapterQna(this, qnaList);
qnaRv.setAdapter(adapterQna);
//get all products
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
//before getting reset List
qnaList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
ModelQna modelQna = dataSnapshot.getValue(ModelQna.class);
qnaList.add(modelQna);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseerror) {
}
});
}
private void showQnaUI() {
//show orders ui and hide products ui
QnaRl.setVisibility(View.GONE);
}
}
Model
public class ModelFaq {
private String faqId,faqTitle,faqContent, timestamp,uid,faqCategory;
public ModelFaq() {
}
public ModelFaq(String faqId, String faqTitle, String faqContent, String timestamp, String uid, String faqCategory) {
this.faqId = faqId;
this.faqTitle = faqTitle;
this.faqContent = faqContent;
this.timestamp = timestamp;
this.uid = uid;
this.faqCategory = faqCategory;
}
public String getFaqId() {
return faqId;
}
public void setFaqId(String faqId) {
this.faqId = faqId;
}
public String getFaqTitle() {
return faqTitle;
}
public void setFaqTitle(String faqTitle) {
this.faqTitle = faqTitle;
}
public String getFaqContent() {
return faqContent;
}
public void setFaqContent(String faqContent) {
this.faqContent = faqContent;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getFaqCategory() {
return faqCategory;
}
public void setFaqCategory(String faqCategory) {
this.faqCategory = faqCategory;
}
}
Qna Adapter
public class AdapterQna extends RecyclerView.Adapter<AdapterQna.HolderQna> {
private Context context;
public ArrayList<ModelQna> qnaList;
public AdapterQna(Context context, ArrayList<ModelQna> qnaList) {
this.context = context ;
this.qnaList = qnaList ;
}
#NonNull
#Override
public HolderQna onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//inflate layout
View view = LayoutInflater.from(context).inflate(R.layout.qna_item, parent, false);
return new HolderQna(view);
}
#Override
public void onBindViewHolder(#NonNull HolderQna holder, int position) {
ModelQna modelQna = qnaList.get(position);
String id = modelQna.getQnaId();
String uid = modelQna.getUid();
String qnaContent = modelQna.getQnaContent();
String qnaTitle = modelQna.getQnaTitle();
String timestamp = modelQna.getTimestamp();
//set data
holder.titleTextView.setText(qnaTitle);
holder.ContentTextView.setText(qnaContent);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
}
#Override
public int getItemCount() {
return qnaList.size();
}
class HolderQna extends RecyclerView.ViewHolder{
/*holds views of recyclerview*/
private TextView titleTextView, ContentTextView;
public HolderQna(#NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.item_post_title);
ContentTextView = itemView.findViewById(R.id.item_post_content);
}
}
}

Can you please change the code in your HolderQna to:
class HolderQna extends RecyclerView.ViewHolder{
/*holds views of recyclerview*/
private TextView titleTextView, ContentTextView;
public HolderQna(#NonNull View itemView) {
super(itemView);
titleTextView = itemView.findViewById(R.id.item_post_title);
ContentTextView = itemView.findViewById(R.id.item_post_content);
}
public void bind(qna: ModelQna){
titleTextView.setText(qna.qnaTitle);
ContentTextView.setText(qna.qnaContent);
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//handle item clicks, show item details
}
});
}
}
And your onBindViewHolder override of the AdapterQna to:
#Override
public void onBindViewHolder(#NonNull HolderQna holder, int position) {
ModelQna modelQna = qnaList.get(position);
String id = modelQna.getQnaId();
String uid = modelQna.getUid();
String qnaContent = modelQna.getQnaContent();
String qnaTitle = modelQna.getQnaTitle();
String timestamp = modelQna.getTimestamp();
//set data
holder.bind(modelQna);
}
Finally change your loadQna() function declaration as follows:
private void loadAllQna() {
qnaList = new ArrayList<>();
//get all products
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
//before getting reset List
qnaList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()){
ModelQna modelQna = dataSnapshot.getValue(ModelQna.class);
qnaList.add(modelQna);
}
adapterQna = new AdapterQna(this, qnaList);
qnaRv.setAdapter(adapterQna);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseerror) {
Log.e("QnaActivity", databaseError.toString());
}
});
}

As far as I can see in your screenshot, the Qna node it's not nested under any UID, but directly under the Employees node. So when you attach a listener to the following node:
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Employees");
reference.child(firebaseAuth.getUid()).child("Qna").addValueEventListener(/*...*/);
You will not be able to get any results, because such a reference doesn't exist. To solve this, you either create a reference that points exactly to "Qna":
DatabaseReference db = FirebaseDatabase.getInstance().getReference();
DatabaseReference qnaRef = db.child("Employees").child("Qna");
qnaRef.addValueEventListener(/*...*/);
Or you move the "Qna" node under the UID of the user, and leave the code unchanged.
Besides that, there is also another problem. The name of the fields in your ModelFaq class are different than the name of the properties in your database. You have in your ModelFaq class four fields called faqId, faqTitle, faqContent, faqCategory, all starting with faq while in the database I see that the names are different, qnaId, qnaTitle, qnaContent, qnaCategory, all are starting wiht qna, and this is not correct. So in order to be able to map a node into an object of type ModelFaq, the names must match. The only two fields that match are the timestamp and the uid.
In this case, you have two solutions. The first one would to change the name of your fieds in the ModelFaq class according to what it already exists in the database or you can use the PropertyName annotation in front of the getters like this:
#PropertyName("qnaId")
public String getFaqId() {
return faqId;
}

I have this error : "Can't convert object of type java.lang.String to type com.flashpub.flash.imageSection" and i don't know why

I've created a listView, and since i'm opening one of the item, the application need to fetch all image of the application, but it's doesn't work, i can't figure it out why that's showing me this error.
Thank you for helping !
That's my model on Firebase :
imageSection.java
package com.flashpub.flash;
import java.util.List;
public class imageSection {
String imageUrl;
public imageSection(){
}
public imageSection(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getImageUrl() {
return imageUrl;
}
}
chooseSection.java
package com.flashpub.flash;
import java.util.List;
public class chooseSection {
String sectionn;
public chooseSection() {
}
public chooseSection(String sectionn) {
this.sectionn = sectionn;
}
public String getSectionn() {
return sectionn;
}
}
chooseSectionActivity.java
public class ChooseSectionActivity extends AppCompatActivity {
ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;
//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choose_section);
listView = findViewById(R.id.listView);
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference();
myRef.keepSynced(true);
Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
Log.i("salut", query.toString());
FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
.setLayout(R.layout.section_list)
.setQuery(query,chooseSection.class)
.build();
adapter = new FirebaseListAdapter<chooseSection>(options) {
#Override
protected void populateView(#NonNull View view, #NonNull chooseSection model, int position) {
TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
sectionView.setText(model.getSectionn());
chooseSection lu = sectionChosse;
//String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
//allItemsList.put(position, model.getSectionn());
}
};
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//String item = allItemsList.get(position);
Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
//intent.putExtra("key", item);
startActivity(intent);
}
});
listView.setAdapter(adapter);
}
#Override
protected void onStart() {
super.onStart();
adapter.startListening();
}
#Override
protected void onStop() {
super.onStop();
adapter.stopListening();
}
}
PubsSectionActivity.java
public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pubs_section);
viewFlipp = findViewById(R.id.viewFlipper);
databaseReference = FirebaseDatabase.getInstance().getReference();
slideLists = new ArrayList<>();
}
#Override
protected void onStart() {
super.onStart();
usingFirebaseDatabase();
}
private void usingFirebaseDatabase() {
String lolipop = "Coiffeur";
databaseReference.child("Sections/Restaurant")
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
slideLists.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
imageSection model = snapshot.getValue(imageSection.class);
slideLists.add(model);
}
Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
usingFirebaseImages(slideLists);
} else {
Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
private void usingFirebaseImages(List<imageSection> slideLists) {
for (int i = 0; i < slideLists.size(); i++) {
String downloadImageUrl = slideLists.get(i).getImageUrl();
Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
ImageView imageView = new ImageView(this);
Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
viewFlipp.addView(imageView);
viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
}
}
}
Help me please, i'm stuck !!
i don't know why there is this error...

You're attaching a listener to Sections/Restaurant. Since that is one specific restaurant, you don't need to loop over the children in onDataChange.
So:
databaseReference.child("Sections/Restaurant")
.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
slideLists.clear();
imageSection model = snapshot.getValue(imageSection.class);
slideLists.add(model);
Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
usingFirebaseImages(slideLists);
} else {
Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
}
}

Can't convert object of type java.lang.String to type (Firebase,RecyclerView)

I got two RecyclerView on the same page at this moments which are Breakfast and Lunch RecyclerView but I am facing the following error Can't convert object of type java.lang.String to type com.example
It highlights this line
userRecordslist.add(ds.getValue(UserRecordsModel.class));
I have tried several ways.
but when I used this code , the data from different record was displayed in the Breakfast RecyclerView
myRef = FirebaseDatabase.getInstance().
getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(date_record);
these are the screenshots of my Firebase and my App. You can see both data from different record is displayed on the same RecyclerView.
and later I tried to use this "new" code for database reference, the data that was supposedly retrieved from Firebase was NOT be displayed on the Breakfast Recycler View and I got the Can't convert object of type java.lang.String to type error
myRef = FirebaseDatabase.getInstance().
getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(date_record).child("BreakfastRecord");
I want to fetch the data and display it in the "suppose" RecyclerView. Please help out.
This code for my PlanMeal activity:
//BUTTON
Button backBtn;
Button addMealBreakBtn;
Button addMealLunchBtn;
Button addMealDinnerBtn;
//DATABASE
FirebaseAuth mAuth;
FirebaseUser currentUser;
DatabaseReference userRecordRef, myRef,requiredCalorieRef, mylunchRef;
//TEXT VIEW
TextView userRequiredCalorie;
ArrayList<UserRecordsModel> userRecordslist;
RecyclerView recyclerView, recyclerViewlunch;
private RecyclerView.Adapter userRecordHolder;
//DATE
String date_record ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_plan_meal_user);
date_record = new SimpleDateFormat("yyMMdd", Locale.getDefault()).format(new Date());
//create a date string.
String date_n = new SimpleDateFormat("MMM dd, yyyy", Locale.getDefault()).format(new Date());
//get hold of textview.
TextView date = (TextView) findViewById(R.id.datePlanMeal);
//set it as current date.
date.setText(date_n);
//INI VIEWS
userRequiredCalorie= (TextView) findViewById(R.id.outputPlanMealCalorie);
//FIREBASE AUTH
mAuth = FirebaseAuth.getInstance();
currentUser=mAuth.getCurrentUser();
//DATABASE REFERENCE
myRef = FirebaseDatabase.getInstance().
getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(date_record);
/*mylunchRef=FirebaseDatabase.getInstance().
getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(date_record).child("LunchRecord");*/
//myRef = FirebaseDatabase.getInstance().getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid());
//mylunchRef = FirebaseDatabase.getInstance().getReference("UsersRecords").child(FirebaseAuth.getInstance().getCurrentUser().getUid());
//RECYCLER VIEW
//*********BREAKFAST******************************************//
recyclerView = findViewById(R.id.userRecordRecylerView);
LinearLayoutManager manager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(manager);
recyclerView.setHasFixedSize(true);
//ADAPTER
userRecordslist = new ArrayList<>();
userRecordHolder = new UserRecordsHolder(userRecordslist);
recyclerView.setAdapter(userRecordHolder);
//*********LUNCH******************************************//
recyclerViewlunch = findViewById(R.id.userRecordRecylerViewLunch);
LinearLayoutManager manager1 = new LinearLayoutManager(this);
recyclerViewlunch.setLayoutManager(manager1);
recyclerViewlunch.setHasFixedSize(true);
//ADAPTER
userRecordslist = new ArrayList<>();
userRecordHolder = new UserRecordsHolder(userRecordslist);
recyclerViewlunch.setAdapter(userRecordHolder);
//BUTTON
addMealBreakBtn = (Button) findViewById(R.id.addMealBreakBtn);
backBtn = (Button)findViewById(R.id.backBtnPlan) ;
//**********************DATABASE REFERENCE FOR USER REQUIRED CALORIE***************************//
requiredCalorieRef = FirebaseDatabase.getInstance().getReference("Users").child(FirebaseAuth.getInstance().getCurrentUser().getUid());
requiredCalorieRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
String userCalorieSuggestion = String.valueOf((dataSnapshot.child("daily calorie").getValue()));
userRequiredCalorie.setText((userCalorieSuggestion +"kcal"));
/*String userCalorieSuggestion = Double.toString((Double) dataSnapshot.child("daily calorie").getValue());
showDailyCalorie.setText(("Daily Calorie Suggestion: " + userCalorieSuggestion +"kcal"));*/
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
//BACK BUTTON*************************************************
backBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent signIn = new Intent(PlanMealUser.this,HomepageUser.class);
startActivity(signIn);
}
});
//ADD MEAL BUTTONS**********************************************
addMealBreakBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent breakfast = new Intent(PlanMealUser.this,ViewProduct.class);
startActivity(breakfast);
}
});
addMealLunchBtn = (Button) findViewById(R.id.addMealLunchBtn);
addMealLunchBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent signIn = new Intent(PlanMealUser.this,ViewProduct_Lunch.class);
startActivity(signIn);
}
});
addMealDinnerBtn = (Button) findViewById(R.id.addMealDinnerBtn);
addMealDinnerBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent signIn = new Intent(PlanMealUser.this,ViewProduct.class);
startActivity(signIn);
}
});
}
#Override
protected void onStart() {
super.onStart();
if (myRef != null) {
myRef.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
userRecordslist = new ArrayList<>();
for (DataSnapshot ds : dataSnapshot.getChildren()) {
userRecordslist.add(ds.getValue(UserRecordsModel.class));
}
UserRecordsHolder userRecordHolder = new UserRecordsHolder(userRecordslist);
recyclerView.setAdapter(userRecordHolder);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Toast.makeText(PlanMealUser.this, databaseError.getMessage(),
Toast.LENGTH_SHORT).show();
}
});
}
}
}
This is my Model :
package com.example.buddymealplanneruser.Child.UserRecords;
public class UserRecordsModel {
private String foodName;
private String foodCalorie;
//constructor
public UserRecordsModel (String foodName,
String foodCalorie
)
{
this.foodName = foodName;
this.foodCalorie = foodCalorie;
}
public UserRecordsModel(){
}
//Getter and Setter
public String getFoodName() {
return foodName;
}
public void setFoodName(String foodName) {
this.foodName = foodName;
}
public String getFoodCalorie() {
return foodCalorie;
}
public void setFoodCalorie(String foodCalorie) {
this.foodCalorie = foodCalorie;
}
}
This is my Adapter
public class UserRecordsHolder extends RecyclerView.Adapter<UserRecordsHolder.MyURHolder> {
Context context;
ArrayList<UserRecordsModel> userRecordslist;
public UserRecordsHolder (ArrayList<UserRecordsModel> userRecordslist)
{
this.userRecordslist=userRecordslist;
}
#NonNull
#Override
public MyURHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_user_records, viewGroup,false);
return new MyURHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyURHolder myURHolder, int i) {
myURHolder.foodName.setText(userRecordslist.get(i).getFoodName());
myURHolder.foodCalorie.setText(userRecordslist.get(i).getFoodCalorie());
}
#Override
public int getItemCount()
{
return userRecordslist.size();
}
class MyURHolder extends RecyclerView.ViewHolder
{
TextView foodName, foodCalorie;
public MyURHolder (#NonNull View itemView){
super(itemView);
foodName = itemView.findViewById(R.id.userRecordsFName);
foodCalorie = itemView.findViewById(R.id.userRecordsKcal);
}
}
}
Hope someone can help.

You'll need one more level beneath BreakfastRecord or LunchRecord:
UserRecords
UID
Date
BreakfastRecord
1
foodCalorie
foodName
2
foodCalorie
foodName
3
foodCalorie
foodName

Firebase retrieving data to customlistview [Android]

My Error:
E/UncaughtException: com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.stitch.fractions.Profile.userInfo.UserInformation
at com.google.android.gms.internal.zzamy.zze(Unknown Source)
at com.google.android.gms.internal.zzamy.zzb(Unknown Source)
at com.google.android.gms.internal.zzamy.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.stitch.fractions.Scoreboard.activity.activity.ScoreboardActivity$1.onDataChange(ScoreboardActivity.java:49)
at com.google.firebase.database.Query$1.onDataChange(Unknown Source)
at com.google.android.gms.internal.zzajp.zza(Unknown Source)
at com.google.android.gms.internal.zzakp.zzcxi(Unknown Source)
at com.google.android.gms.internal.zzaks$1.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:743)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5546)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)
I/FA: Tag Manager is not found and thus will not be used
I/Process: Sending signal. PID: 22183 SIG: 9
Disconnected from the target VM, address: 'localhost:8604', transport: 'socket'
My Activity Class:
public class ScoreboardActivity extends AppCompatActivity {
private FirebaseAuth mAuth;
private DatabaseReference dbRef;
private ArrayList<UserInformation> mArrayUserInfo = new ArrayList<>();
private String userId;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scoreboard);
mAuth = FirebaseAuth.getInstance();
userId = mAuth.getCurrentUser().getUid();
dbRef = FirebaseDatabase.getInstance().getReference();
displayData();
}
public void displayData() {
dbRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot users : dataSnapshot.getChildren()) {
for (DataSnapshot user : users.getChildren()) {
if (user.getKey().equals(userId)) {
for (DataSnapshot sItem : user.getChildren()) {
if (!(sItem.getKey().equals("age"))) {
UserInformation scoreActivity = sItem.getValue(UserInformation.class);
mArrayUserInfo.add(scoreActivity);
ScoreAdapter sAdapter = new ScoreAdapter(getApplicationContext(), mArrayUserInfo);
ListView listScore = (ListView)findViewById(R.id.lvScore);
listScore.setAdapter(sAdapter);
}
}
}
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(ScoreboardActivity.this, "Error Kid", Toast.LENGTH_SHORT).show();
}
});
}
}
Here is My Model Class:
public class UserInformation {
public String name;
public String age;
public String score;
public UserInformation() {
}
public UserInformation(String name, String age, String score) {
this.name = name;
this.age = age;
this.score = score;
}
public String getName() {
return name;
}
public String getAge() {
return age;
}
public String getScore(){
return score;
}
}
}
Here is how i Wrote to Database:
public class ProfileActivity extends AppCompatActivity {
private FirebaseAuth firebaseAuth;
private TextView mUserEmail, mUserScore;
private Button mBtnLogOut, mBtnSave, mBtnScore;
private EditText mEdtProfileName, mEdtProfileAge;
private DatabaseReference dbRefer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
initComponent();
getCurrentUser();
checkCurrentUser();
firebaseDatabase();
mBtnLogOut.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
firebaseAuth.signOut();
finish();
Intent back = new Intent(ProfileActivity.this, HomeActivity.class);
startActivity(back);
Toast.makeText(ProfileActivity.this, "Good Bye", Toast.LENGTH_SHORT).show();
}
});
mBtnSave.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
saveUserInfor();
}
});
mBtnScore.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent game = new Intent(ProfileActivity.this, ScoreboardActivity.class);
startActivity(game);
}
});
}
public void initComponent() {
mBtnLogOut = (Button) findViewById(R.id.btnOut);
mUserEmail = (TextView) findViewById(R.id.userEmail);
firebaseAuth = FirebaseAuth.getInstance();
mEdtProfileName = (EditText) findViewById(R.id.edtProfileName);
mEdtProfileAge = (EditText) findViewById(R.id.edtProfileAge);
mBtnSave = (Button) findViewById(R.id.btnSave);
mUserScore = (TextView) findViewById(R.id.userScore);
mBtnScore = (Button) findViewById(R.id.btnScore);
}
public void checkCurrentUser() {
firebaseAuth = FirebaseAuth.getInstance();
if (firebaseAuth.getCurrentUser() == null) {
finish();
Intent home = new Intent(ProfileActivity.this, HomeActivity.class);
startActivity(home);
}
}
public void getCurrentUser() {
FirebaseUser user = firebaseAuth.getCurrentUser();
mUserEmail.setText("Current User: " + user.getEmail());
}
public void firebaseDatabase() {
dbRefer = FirebaseDatabase.getInstance().getReference();
mEdtProfileName.getText().toString().trim();
mEdtProfileAge.getText().toString().trim();
}
public void saveUserInfor() {
String name = mEdtProfileName.getText().toString().trim();
String age = mEdtProfileAge.getText().toString().trim();
SharedPreferences prefsName = getSharedPreferences("Name", MODE_PRIVATE);
SharedPreferences.Editor editorName = prefsName.edit();
editorName.putString("sentname", name);
editorName.commit();
SharedPreferences prefsAge = getSharedPreferences("Age", MODE_PRIVATE);
SharedPreferences.Editor editorAge = prefsAge.edit();
editorAge.putString("sentage", age);
editorAge.commit();
SharedPreferences prefs = getSharedPreferences("Data",MODE_PRIVATE);
String data = prefs.getString("time","hi");
if (TextUtils.isEmpty(name)) {
mEdtProfileName.setError("Empty Field !!!");
return;
}
if (TextUtils.isEmpty(age)) {
mEdtProfileAge.setError("Empty Field !!!");
return;
}
UserInformation userInfo = new UserInformation(name, age, data);
FirebaseUser user = firebaseAuth.getCurrentUser();
dbRefer.child("User").child(user.getUid()).setValue(userInfo);
Toast.makeText(this, "Data Saved", Toast.LENGTH_SHORT).show();
}
}
My Adapter Class:
public class ScoreAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mScoreInflater;
private ArrayList<UserInformation> mUserInfo;
public ScoreAdapter(Context mContext, ArrayList<UserInformation> userInfo) {
this.mContext = mContext;
this.mScoreInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mUserInfo = userInfo;
}
#Override
public int getCount() {
return mUserInfo.size();
}
#Override
public Object getItem(int position) {
return mUserInfo.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
classScoreHolder holder;
if (convertView == null) {
convertView = mScoreInflater.inflate(R.layout.scoreboard_row, parent, false);
holder = new classScoreHolder();
holder.mTvScoreName = (TextView) convertView.findViewById(R.id.tvScoreName);
holder.mTvScorePoint = (TextView) convertView.findViewById(R.id.tvScorePoint);
convertView.setTag(holder);
} else {
holder = (classScoreHolder) convertView.getTag();
}
TextView tvScoreName = holder.mTvScoreName;
TextView tvScorePoint = holder.mTvScorePoint;
UserInformation getUserInfo = (UserInformation) getItem(position);
tvScoreName.setText("User Name: " + getUserInfo.getName());
tvScorePoint.setText("User Score: " + getUserInfo.getScore());
return convertView;
}
private static class classScoreHolder {
public TextView mTvScoreName;
public TextView mTvScorePoint;
}
current database has name, age and score. What I'm trying to get is only Name and Age from Firebase Database into Customlistview.

Not 100% sure, but it look like you go one level too far in your hierarchy. If I am right, this would simplify your code. Try this :
public void displayData() {
dbRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot users : dataSnapshot.getChildren()) {
for (DataSnapshot user : users.getChildren()) {
if (user.getKey().equals(userId)) {
UserInformation scoreActivity = user.getValue(UserInformation.class);
mArrayUserInfo.add(scoreActivity);
}
}
}
ScoreAdapter sAdapter = new ScoreAdapter(getApplicationContext(), mArrayUserInfo);
ListView listScore = (ListView)findViewById(R.id.lvScore);
listScore.setAdapter(sAdapter);
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(ScoreboardActivity.this, "Error Kid", Toast.LENGTH_SHORT).show();
}
});
}