Got Data in Recycler View List any activity from firebase realtime DB (Name, Phone number, E-mail)

1. Activity (activity_main.xml)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout>

1. Activity (mainactivity.java)

import android.os.Bundle; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; 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.util.ArrayList; import java.util.List; public class MainActivity2 extends AppCompatActivity { private RecyclerView recyclerView; private UserAdapter userAdapter2; private List<User1> user1List; private DatabaseReference databaseReference; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_user_list); recyclerView = findViewById(R.id.recyclerView); recyclerView.setLayoutManager(new LinearLayoutManager(this)); user1List = new ArrayList<>(); userAdapter2 = new UserAdapter(user1List); recyclerView.setAdapter(userAdapter2); // Fetch data from Firebase databaseReference = FirebaseDatabase.getInstance().getReference("Users"); databaseReference.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(@NonNull DataSnapshot snapshot) { user1List.clear(); for (DataSnapshot userSnapshot : snapshot.getChildren()) { User1 user1 = userSnapshot.getValue(User1.class); user1List.add(user1); } userAdapter2.notifyDataSetChanged(); } @Override public void onCancelled(@NonNull DatabaseError error) { Toast.makeText(MainActivity2.this, "Failed to retrieve data", Toast.LENGTH_SHORT).show(); } }); } }

Class (UserAdapter2.java)

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 abstract class UserAdapter2 extends RecyclerView.Adapter<UserAdapter2.UserViewHolder> { private List<User1> user1List; public UserAdapter2(List<User1> user1List) { this.user1List = user1List; } @NonNull @Override public UserAdapter2.UserViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_user2, parent, false); return new UserViewHolder(view); } @Override public void onBindViewHolder(@NonNull UserViewHolder holder, int position) { User1 user1 = user1List.get(position); holder.nameTextView.setText(user1.name); holder.phoneTextView.setText(user1.phone); holder.emailTextView.setText(user1.email); } @Override public int getItemCount() { return user1List.size(); } static class UserViewHolder extends RecyclerView.ViewHolder { TextView nameTextView, phoneTextView, emailTextView; public UserViewHolder(@NonNull View itemView) { super(itemView); nameTextView = itemView.findViewById(R.id.nameTextView); phoneTextView = itemView.findViewById(R.id.phoneTextView); emailTextView = itemView.findViewById(R.id.emailTextView); } } }

Resource layout (item_user2.java)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:padding="16dp"> <TextView android:id="@+id/nameTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Name"/> <TextView android:id="@+id/phoneTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Phone Number"/> <TextView android:id="@+id/emailTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Email"/> </LinearLayout>