Retrive Data From Firebase in Android

 Xml :- 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
    tools:context=".ui.dashboard.DashboardFragment">
<androidx.recyclerview.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/recycleviewgg"/>

</LinearLayout>

Xml:- 

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:cardElevation="10dp"
    app:cardCornerRadius="10dp"
    android:layout_margin="10dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <TextView

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="Form"
        android:layout_gravity="center"
        android:textStyle="bold"/>

    <TextView
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
       />
    <TextView
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/address"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    <TextView
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/pincode"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
    <TextView
        android:textSize="20sp"
        android:textStyle="bold"
        android:id="@+id/mobilenumber"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
</LinearLayout>
</androidx.cardview.widget.CardView>



Java Code:-


package com.niranjan.cloudfirebase.ui.dashboard;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;
import com.niranjan.cloudfirebase.Adapter;
import com.niranjan.cloudfirebase.Model;
import com.niranjan.cloudfirebase.R;

import java.util.ArrayList;
import java.util.List;

public class DashboardFragment extends Fragment {
FirebaseFirestore firestore;
FirebaseAuth auth;

RecyclerView recyclerView;
Adapter adapter;
List<Model> modelList;
public DashboardFragment(){

}
    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {

        View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
firestore=FirebaseFirestore.getInstance();
auth=FirebaseAuth.getInstance();

recyclerView=root.findViewById(R.id.recycleviewgg);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

modelList= new ArrayList<>();
adapter = new Adapter(getActivity(),modelList);
recyclerView.setAdapter(adapter);

        firestore.collection("Address").document(auth.getCurrentUser().getUid())
                .collection("CurrentUser").get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()){

                    for (DocumentSnapshot documentSnapshot : task.getResult().getDocuments()){
                        Model model = documentSnapshot.toObject(Model.class);
                        modelList.add(model);
                        adapter.notifyDataSetChanged();

                    }
                }
            }
        });
        return root;
    }
}



Model class :-


package com.niranjan.cloudfirebase;

public class Model {
    String name,address,pincode,mobilenumbr;

    public Model() {
    }

    public Model(String name, String address, String pincode, String mobilenumbr) {
        this.name = name;
        this.address = address;
        this.pincode = pincode;
        this.mobilenumbr = mobilenumbr;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPincode() {
        return pincode;
    }

    public void setPincode(String pincode) {
        this.pincode = pincode;
    }

    public String getMobilenumbr() {
        return mobilenumbr;
    }

    public void setMobilenumbr(String mobilenumbr) {
        this.mobilenumbr = mobilenumbr;
    }
}






Adapter class :- 



package com.niranjan.cloudfirebase;

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 java.util.List;

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
    private Context context;
    private List<Model> modelList;

    public Adapter(Context context, List<Model> modelList) {
        this.context = context;
        this.modelList = modelList;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new Adapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.showitem,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.name.setText(modelList.get(position).getName());
        holder.address.setText(modelList.get(position).getAddress());
        holder.pincode.setText(modelList.get(position).getPincode());
        holder.mobilenumbr.setText(modelList.get(position).getMobilenumbr());
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView name,address,pincode,mobilenumbr;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            name=itemView.findViewById(R.id.name);
            address=itemView.findViewById(R.id.address);
            pincode=itemView.findViewById(R.id.pincode);
            mobilenumbr=itemView.findViewById(R.id.mobilenumber);
        }
    }
}