Cannot retrieve data from database (FIREBASE) to recycler view - android-recyclerview

Question

I can't retrieve my data from database into recycler view. but when i add the data, the data successfully store into database. I cannot identified which part having a problem. Hoping someone can help me to solve this problem.
This is my adapter code.
public class UsersRecyclerAdapter extends RecyclerView.Adapter<UsersRecyclerAdapter.ViewHolder> {
Context context;
ArrayList<UsersItem> usersItemArrayList;
DatabaseReference databaseReference;
public UsersRecyclerAdapter(Context context, ArrayList<UsersItem> usersItemArrayList) {
this.context = context;
this.usersItemArrayList = usersItemArrayList;
databaseReference = FirebaseDatabase.getInstance().getReference();
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
View view = layoutInflater.inflate(R.layout.activity_user_item, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
UsersItem USERS = usersItemArrayList.get(position);
holder.textBloodPressure.setText(USERS.getBloodPressure());
holder.textOxygenRate.setText(USERS.getOxygenRate());
holder.textPulseRate.setText(USERS.getPulseRate());
holder.textMedication.setText(USERS.getMedication());
holder.textTodayActivity.setText(USERS.getTodayActivity());
holder.textWaterIntake.setText(USERS.getWaterIntake());
holder.buttonUpdate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ViewDialogUpdate viewDialogUpdate = new ViewDialogUpdate();
viewDialogUpdate.showDialog(context, USERS.getUserID(), USERS.getBloodPressure(), USERS.getOxygenRate(), USERS.getPulseRate(), USERS.getMedication(), USERS.getTodayActivity(), USERS.getWaterIntake());
}
});
holder.buttonDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ViewDialogConfirmDelete viewDialogConfirmDelete = new ViewDialogConfirmDelete();
viewDialogConfirmDelete.showDialog(context, USERS.getUserID());
}
});
}
#Override
public int getItemCount() {
return usersItemArrayList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView textBloodPressure, textOxygenRate, textPulseRate, textMedication, textTodayActivity, textWaterIntake;
Button buttonDelete;
Button buttonUpdate;
public ViewHolder(#NonNull View itemView) {
super(itemView);
textBloodPressure = itemView.findViewById(R.id.textBloodPressure);
textOxygenRate = itemView.findViewById(R.id.textOxygenRate);
textPulseRate = itemView.findViewById(R.id.textPulseRate);
textMedication = itemView.findViewById(R.id.textMedication);
textTodayActivity = itemView.findViewById(R.id.textTodayActivity);
textWaterIntake = itemView.findViewById(R.id.textWaterIntake);
buttonDelete = itemView.findViewById(R.id.buttonDelete);
buttonUpdate = itemView.findViewById(R.id.buttonUpdate);
}
}
enter image description here
This is add health details code. where data from this page will will store in "USERS" table and retrieve into recycler view.
public class AddJournal extends AppCompatActivity {
DatabaseReference databaseReference;
RecyclerView recyclerView;
ArrayList<UsersItem> usersItemArrayList;
UsersRecyclerAdapter adapter;
Button buttonAdd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_journal);
//start sini
FirebaseDatabase.getInstance().setPersistenceEnabled(true); // work offline
Objects.requireNonNull(getSupportActionBar()).hide();
databaseReference = FirebaseDatabase.getInstance().getReference();
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
usersItemArrayList = new ArrayList<>();
buttonAdd = findViewById(R.id.buttonAdd);
buttonAdd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ViewDialogAdd viewDialogAdd = new ViewDialogAdd();
viewDialogAdd.showDialog(AddJournal.this);
}
});
readData();
}
private void readData() {
databaseReference.child("USERS").orderByChild("bloodPressure").addValueEventListener(new ValueEventListener() {
#SuppressLint("NotifyDataSetChanged")
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
usersItemArrayList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
UsersItem USERS = dataSnapshot.getValue(UsersItem.class);
usersItemArrayList.add(USERS);
}
adapter = new UsersRecyclerAdapter(AddJournal.this, usersItemArrayList);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
public class ViewDialogAdd {
public void showDialog(Context context) {
final Dialog dialog = new Dialog(context);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setCancelable(false);
dialog.setContentView(R.layout.activity_alert_dialog_add_new_user);
EditText textBloodPressure = dialog.findViewById(R.id.textBloodPressure);
EditText textOxygenRate = dialog.findViewById(R.id.textOxygenRate);
EditText textPulseRate = dialog.findViewById(R.id.textPulseRate);
EditText textMedication = dialog.findViewById(R.id.textMedication );
EditText textTodayActivity = dialog.findViewById(R.id.textTodayActivity);
EditText textWaterIntake = dialog.findViewById(R.id.textWaterIntake);
Button buttonAdd = dialog.findViewById(R.id.buttonAdd);
Button buttonCancel = dialog.findViewById(R.id.buttonCancel);
buttonAdd.setText("ADD");
buttonCancel.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
dialog.dismiss();
}
});
buttonAdd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String id = "USERS" + new Date().getTime();
String bloodPressure = textBloodPressure.getText().toString();
String oxygenRate = textOxygenRate.getText().toString();
String pulseRate = textPulseRate.getText().toString();
String medication = textMedication.getText().toString();
String todayActivity = textTodayActivity.getText().toString();
String waterIntake = textWaterIntake.getText().toString();
if (bloodPressure.isEmpty() || oxygenRate.isEmpty() || pulseRate.isEmpty() || medication.isEmpty() || todayActivity.isEmpty() || waterIntake.isEmpty()) {
Toast.makeText(context, "Please Enter All data...", Toast.LENGTH_SHORT).show();
} else {
databaseReference.child("USERS").child(id).setValue(new UsersItem(id, bloodPressure, oxygenRate, pulseRate, medication, todayActivity, waterIntake));
Toast.makeText(context, "DONE!", Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
}
});
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialog.show();
}
}
}