can not retrieve data from realtime data base into a recyclerView

Question

i am working on a freelancing app called frelance. the idea of the app is to connect freelancers with clients that need their services. and I am trying to retrieve data from the realtime database but it's not working.

ShowActivity Xml

  <?xml version="1.0" encoding="utf-8"?>
  <androidx.constraintlayout.widget.ConstraintLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".ShowActivity">



<androidx.appcompat.widget.SearchView
    android:id="@+id/Search"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp"
    android:background="@color/black"
    android:layout_marginBottom="5dp"
    android:hint="Search"/>

<androidx.recyclerview.widget.RecyclerView

    android:id="@+id/recyclerview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />
   </androidx.constraintlayout.widget.ConstraintLayout>

ShowActivity Java Package com.example.frelance0;

    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.appcompat.widget.SearchView;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;

    import android.content.Intent;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;

    import com.google.firebase.auth.FirebaseAuth;
    import com.google.firebase.database.DataSnapshot;
    import com.google.firebase.database.DatabaseError;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;
    import com.google.firebase.database.ValueEventListener;

    import java.security.PrivateKey;
    import java.util.ArrayList;
    import java.util.Map;

    public class ShowActivity extends AppCompatActivity {

    private RecyclerView recyclerView;

SearchView searchView;


FirebaseAuth mAuth=FirebaseAuth.getInstance();
FirebaseAuth.AuthStateListener firebaseAuthListener;
String user_id = mAuth.getCurrentUser().getUid();

DatabaseReference F_Database= FirebaseDatabase.getInstance().getReference().child("Users");
DatabaseReference Current_user_db = FirebaseDatabase.getInstance().getReference().child("Users").child("Freelancers");



private MyAdapter adapter;
private ArrayList<Model> list;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_show);

    recyclerView = findViewById(R.id.recyclerview);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    list = new ArrayList<>();
    adapter = new MyAdapter(this, list);
    recyclerView.setAdapter(adapter);

    searchView = findViewById(R.id.Search);




    //Log.d("user id", user_id);

    //Log.d("database",F_Database.toString());



    F_Database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            Log.d("OUTSIDE LOOP", snapshot.getChildren().toString());

            for(DataSnapshot dataSnapshot : snapshot.getChildren()){
                Log.d("INSIDE LOOP", "MESSAGE");
                Model model = dataSnapshot.getValue(Model.class);
                list.add(model);
            }

            adapter.notifyDataSetChanged();
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

    if(searchView != null){
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                search(newText);
                return true;
            }
        });
    }



}

private void search(String str){
    ArrayList<Model> mylist = new ArrayList<>();
    for(Model object: list){
        if(object.getEmail().toLowerCase().contains(str.toLowerCase())){
            mylist.add(object);
        }

    }

    MyAdapter newAdapter = new MyAdapter(mylist);
    recyclerView.setAdapter(newAdapter);
}

}

Adapter Code

    package com.example.frelance0;
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;

    import androidx.annotation.NonNull;
    import androidx.recyclerview.widget.RecyclerView;

 import com.example.frelance0.R;

 import java.util.ArrayList;

 public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{

ArrayList<Model> mlist;
Context context;

public MyAdapter(Context context, ArrayList<Model> mlist){
    this.mlist = mlist;
    this.context = context;
}

public MyAdapter(ArrayList<Model> mylist) {
}

@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
    return new MyViewHolder(v);
}

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    Model model = mlist.get(position);
    holder.Name.setText(model.getName());
    holder.Email.setText(model.getEmail());
    holder.JobTitle.setText(model.getJobTitle());

}

@Override
public int getItemCount() {
    return mlist.size();
}

public static class MyViewHolder extends RecyclerView.ViewHolder{

    TextView Name , Email , JobTitle;

    public MyViewHolder(@NonNull View itemView) {
        super(itemView);

        Name= itemView.findViewById(R.id.Name);
        Email= itemView.findViewById(R.id.Email);
        JobTitle= itemView.findViewById(R.id.Job);
    }
}

}

Model Class

 package com.example.frelance0;

 public class Model {

String Name , JobTitle , Email;

public void setName(String name) {
    Name = name;
}

public void setJobTitle(String jobTitle) {
    JobTitle = jobTitle;
}

public void setEmail(String email) {
    Email = email;
}

public String getName() {
    return Name;
}

public String getJobTitle() {
    return JobTitle;
}

public String getEmail() {
    return Email;
}
  }

and Here is a screenshot of my Realtime Database:

Realtime Database

Realtime Database

Realtime Database

as you can see its nested and i don't know why.

app error recyclerview screenshot

I will also attach the Sign up Code in Case You need it Because i Have a nested database problem:

    package com.example.frelance0;

    import androidx.annotation.NonNull;
    import androidx.annotation.Nullable;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;

    import android.app.Activity;
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.net.Uri;
    import android.os.Bundle;
    import android.provider.MediaStore;
    import android.text.TextUtils;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageView;
    import android.widget.ProgressBar;
    import android.widget.TextView;

    import com.bumptech.glide.Glide;
    import com.example.frelance0.C_Sign_in;
    import com.example.frelance0.Client_Profile;
    import com.example.frelance0.R;
    import com.google.android.gms.tasks.OnCompleteListener;
    import com.google.android.gms.tasks.OnFailureListener;
    import com.google.android.gms.tasks.OnSuccessListener;
    import com.google.android.gms.tasks.Task;
    import com.google.firebase.auth.AuthResult;
    import com.google.firebase.auth.FirebaseAuth;
    import com.google.firebase.auth.FirebaseUser;
    import com.google.firebase.database.DataSnapshot;
    import com.google.firebase.database.DatabaseError;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;
    import com.google.firebase.database.ValueEventListener;
    import com.google.firebase.storage.FirebaseStorage;
    import com.google.firebase.storage.StorageReference;
    import com.google.firebase.storage.UploadTask;

    import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Map;

    public class F_Sign_Up extends AppCompatActivity {

EditText mFirstName , mLastName , mEmail , mPassword  , mphone;
EditText insta , behance , website ;
EditText Skill1 , Skill2 , Skill3  , Skill4   , Brief , jobTitle , Software1 , Software2 , Software3 , Software4;

ImageView ProfileImg;

Button register;
TextView mlogin;
ProgressBar progressBar;
String ProfileimgUrl;

FirebaseAuth mAuth;
FirebaseAuth.AuthStateListener firebaseAuthListener;
DatabaseReference F_Database;
Uri resultUri;







@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_f__sign__up);



    //connect Xml



    mFirstName= (EditText) findViewById(R.id.FirstName);
    mLastName= (EditText) findViewById(R.id.LastName);
    mEmail= (EditText) findViewById(R.id.email);
    mPassword= (EditText) findViewById(R.id.password);
    mphone= (EditText) findViewById(R.id.phone);
    register= (Button) findViewById(R.id.signUp);
    mlogin = (TextView) findViewById(R.id.logIn);
    progressBar= (ProgressBar) findViewById(R.id.progressBar);
    Skill1 = (EditText) findViewById(R.id.skill1);
    Skill2 = (EditText) findViewById(R.id.skill2);
    Skill3 = (EditText) findViewById(R.id.skill3);
    Skill4 = (EditText) findViewById(R.id.skill4);
    Software1 = (EditText) findViewById(R.id.software1);
    Software2 = (EditText) findViewById(R.id.software2);
    Software3 = (EditText) findViewById(R.id.software3);
    Software4 =(EditText) findViewById(R.id.software4);
    jobTitle = (EditText) findViewById(R.id.JobTiTleHint);
    Brief = (EditText) findViewById(R.id.Brief);

    insta = (EditText) findViewById(R.id.insta);
    behance = (EditText) findViewById(R.id.Behance);
    website = (EditText) findViewById(R.id.Website);



    ProfileImg = findViewById(R.id.ProfilePic);

    String img = ProfileImg.toString();

    ProfileImg.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent , 1);
        }
    });
















    mAuth =FirebaseAuth.getInstance();

    firebaseAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {

            FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

            if(user != null) {

                Intent intent = new Intent(com.example.frelance0.F_Sign_Up.this, Freelancer_Profile.class);

                String P = mphone.getText().toString();
                intent.putExtra("Phone",P);
                startActivity(intent);
                return;

            }


        }
    };

    register.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String Email = mEmail.getText().toString().trim();
            String Password = mPassword.getText().toString().trim();









            mAuth =FirebaseAuth.getInstance();


            progressBar.setVisibility(View.VISIBLE);

            mAuth.createUserWithEmailAndPassword(Email,Password).addOnCompleteListener(com.example.frelance0.F_Sign_Up.this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {


                    // if (task.isSuccessful()){
                    //Toast.makeText(F_Sign_Up.this, "Sign Up Error", Toast.LENGTH_SHORT).show();

                    if(TextUtils.isEmpty(Email)){

                        mEmail.setError("E-mail is Required");
                        return;
                    }

                    if(TextUtils.isEmpty(Password)){

                        mPassword.setError("Password is Required");
                        return;
                    }
                    if(Password.length() < 6){

                        mPassword.setError("Password Must Be More Than 6 Char ");
                        return;
                    }



                    if(mAuth.getCurrentUser() != null) {

                        String user_id = mAuth.getCurrentUser().getUid();
                        DatabaseReference Current_user_db = FirebaseDatabase.getInstance().getReference().child("Users").child("Freelancers").child(user_id);
                        Current_user_db.setValue(true);

                        F_Database =FirebaseDatabase.getInstance().getReference().child("Users").child("Freelancers").child(user_id);
                        Getinfo();
                        Saveinfo();

                        Intent intent = new Intent(com.example.frelance0.F_Sign_Up.this, loading.class);

                        //Phone Intent

                        String P = mphone.getText().toString();
                        intent.putExtra("Phone",P);


                        startActivity(intent);




                        String Email = mEmail.getText().toString().trim();
                        String Password = mPassword.getText().toString().trim();
                        String FirstName = mFirstName.getText().toString();
                        String LastName =  mLastName.getText().toString();
                        String FullName = mFirstName.getText().toString() + " " + mLastName.getText().toString();
                        String PhoneNum= mphone.getText().toString();
                        String  Fsoftware= Software1.getText().toString();
                        String  ssoftware= Software2.getText().toString();
                        String  tsoftware= Software3.getText().toString();
                        String  Ffsoftware= Software4.getText().toString();
                        String  Fskill= Skill1.getText().toString();
                        String  sskill= Skill2.getText().toString();
                        String  tskill= Skill3.getText().toString();
                        String  Ffskill= Skill4.getText().toString();
                        String  JB= jobTitle.getText().toString();
                        String  B= Brief.getText().toString();
                        String Be = behance.getText().toString();
                        String instag = insta.getText().toString();
                        String web = website.getText().toString();


                        Users user = new Users(FullName,FirstName,LastName,Email,Fskill,sskill,tskill,Ffskill,Fsoftware,ssoftware,tsoftware,Ffsoftware,web,instag,Be,JB,Integer.parseInt(PhoneNum));
                        F_Database.child("Users").child("Freelancers").push().setValue(user);



                    }

                }
            });




        }






    });







}

@Override
protected void onStart() {
    super.onStart();

    mAuth.addAuthStateListener(firebaseAuthListener);
}

@Override
protected void onStop() {
    super.onStop();
    mAuth.removeAuthStateListener(firebaseAuthListener);

}

public void Saveinfo(){

    String Email = mEmail.getText().toString().trim();
    String Password = mPassword.getText().toString().trim();
    String FirstName = mFirstName.getText().toString();
    String LastName =  mLastName.getText().toString();
    String FullName = mFirstName.getText().toString() + " " + mLastName.getText().toString();
    String PhoneNum= mphone.getText().toString();
    String  Fsoftware= Software1.getText().toString();
    String  ssoftware= Software2.getText().toString();
    String  tsoftware= Software3.getText().toString();
    String  Ffsoftware= Software4.getText().toString();
    String  Fskill= Skill1.getText().toString();
    String  sskill= Skill2.getText().toString();
    String  tskill= Skill3.getText().toString();
    String  Ffskill= Skill4.getText().toString();
    String  JB= jobTitle.getText().toString();
    String  B= Brief.getText().toString();
    String Be = behance.getText().toString();
    String instag = insta.getText().toString();
    String web = website.getText().toString();
    Map<String,Object> Map = new HashMap<>();

    Map userinfo = new HashMap();

    userinfo.put("First Name",FirstName);
    userinfo.put("Last Name",LastName);
    userinfo.put("Full Name",FullName);
    userinfo.put("Email",Email);
    userinfo.put("Phone Number" , PhoneNum);
    //Skills
    userinfo.put("Skill 1",Fskill);
    userinfo.put("Skill 2",sskill);
    userinfo.put("Skill 3",tskill);
    userinfo.put("Skill 4",Ffskill);

    //Softwares
    userinfo.put("Software 1",Fsoftware);
    userinfo.put("Software 2",ssoftware);
    userinfo.put("Software 3",tsoftware);
    userinfo.put("Software 4",Ffsoftware);


    //other
    userinfo.put("Brief",B);
    userinfo.put("Job Title",JB);

    userinfo.put("Website",web);
    userinfo.put("Instagram",instag);
    userinfo.put("Behance",Be);




    String user_id = mAuth.getCurrentUser().getUid();

    F_Database.updateChildren(userinfo);

    if(resultUri!= null){
        StorageReference FilePath = FirebaseStorage.getInstance().getReference().child("Profile images").child(user_id);
        Bitmap bitmap = null;
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
        } catch (IOException e) {
            e.printStackTrace();
        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG,20,baos);
        byte[] data = baos.toByteArray();
        UploadTask uploadTask = FilePath.putBytes(data);

        uploadTask.addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                finish();
                return;
            }
        });

        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                Task<Uri> downloadUrl = taskSnapshot.getStorage().getDownloadUrl();
                Map newImg = new HashMap();
                newImg.put("ProfileImageUrl", downloadUrl.toString());
                F_Database.updateChildren(newImg);
                finish();
                return;
            }
        });

    }else {

        finish();
    }





}

public void Getinfo(){
    F_Database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot datasnapshot) {
            if(datasnapshot.exists() && datasnapshot.getChildrenCount()>0){

                String Email = mEmail.getText().toString().trim();
                String Password = mPassword.getText().toString().trim();
                String FirstName = mFirstName.getText().toString();
                String LastName =  mLastName.getText().toString();
               // String FullName = mFirstName.getText().toString() + " " + mLastName.getText().toString();
                String PhoneNum= mphone.getText().toString();
                String  Fsoftware= Software1.getText().toString();
                String  ssoftware= Software2.getText().toString();
                String  tsoftware= Software3.getText().toString();
                String  Ffsoftware= Software4.getText().toString();
                String  Fskill= Skill1.getText().toString();
                String  sskill= Skill2.getText().toString();
                String  tskill= Skill3.getText().toString();
                String  Ffskill= Skill4.getText().toString();
                String  JB= jobTitle.getText().toString();
                String  B= Brief.getText().toString();
                String Be = behance.getText().toString();
                String instag = insta.getText().toString();
                String web = website.getText().toString();
                Map<String,Object> Map = new HashMap<>();





                if(Map.get("First Name")!=null){
                    FirstName = Map.get("First Name").toString();
                    mFirstName.setText(FirstName);

            }

                if(Map.get("Email")!=null){
                    Email = Map.get("Email").toString();
                    mEmail.setText(Email);

                }




                if(Map.get("Password")!=null){
                    Password = Map.get("Password").toString();
                    mPassword.setText(Password);

                }



                if(Map.get("LastName")!=null){
                    LastName = Map.get("LastName").toString();
                    mLastName.setText(LastName);

                }





                if(Map.get("PhoneNum")!=null){
                    PhoneNum = Map.get("PhoneNum").toString();
                    mphone.setText(PhoneNum);

                }




                if(Map.get("Fsoftware")!=null){
                    Fsoftware = Map.get("Fsoftware").toString();
                    Software1.setText(Fsoftware);

                }



                if(Map.get("ssoftware")!=null){
                    ssoftware = Map.get("ssoftware").toString();
                    Software2.setText(ssoftware);

                }




                if(Map.get("tsoftware")!=null){
                    tsoftware= Map.get("ssoftware").toString();
                    Software3.setText(tsoftware);

                }




                if(Map.get("Ffsoftware")!=null){
                    Ffsoftware = Map.get("Ffsoftware").toString();
                    Software4.setText(Ffsoftware);

                }



                if(Map.get("Fskill")!=null){
                    Fskill = Map.get("First Name").toString();
                    Skill1.setText(Fskill);

                }




                if(Map.get("sskill")!=null){
                    sskill = Map.get("First Name").toString();
                    Skill2.setText(sskill);

                }




                if(Map.get("tskill")!=null){
                    tskill = Map.get("tskill").toString();
                    Skill3.setText(tskill);

                }




                if(Map.get("Ffskill")!=null){
                    Ffskill= Map.get("Ffskill").toString();
                    Skill4.setText(Ffskill);

                }




                if(Map.get("JB")!=null){
                    JB = Map.get("JB").toString();
                    jobTitle.setText(JB);

                }




                if(Map.get("B")!=null){
                    B = Map.get("B").toString();
                    Brief.setText(B);

                }


                if(Map.get("Be")!=null){
                    Be = Map.get("Be").toString();
                    behance.setText(Be);

                }


                if(Map.get("instag")!=null){
                    instag = Map.get("instag").toString();
                    insta.setText(instag);

                }


                if(Map.get("web")!=null){
                    web = Map.get("web").toString();
                    website.setText(web);

                }





                if(Map.get("ProfileImageUrl")!=null){

                    ProfileimgUrl = Map.get("ProfileImageUrl").toString();
                    Glide.with(getApplication()).load(ProfileimgUrl).into(ProfileImg);

               }


            }

        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });




}

public void onClick(View view){

    Intent intent = new Intent(com.example.frelance0.F_Sign_Up.this, Freelancer_Log_in.class);

    startActivity(intent);
}


@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == 1 && requestCode == Activity.RESULT_OK);
    final Uri imgUri = data.getData();

    resultUri = imgUri;
    ProfileImg.setImageURI(imgUri);
}

}