Firebase Sing up and login

1. Sing up with data store

package abhiandroid.com.practice;

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

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
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.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

import java.util.Objects;

public class MainActivity extends AppCompatActivity {
// Sing up
    EditText email1, password2;
    Button button;
    FirebaseAuth mAuth;

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

        email1 = findViewById(R.id.email);
        password2 = findViewById(R.id.password);
        button = findViewById(R.id.button);

// Write a message to the database



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

              rsse();

          }

          private void rsse() {

              String email, password;
               email = email1.getText().toString();
               password = password2.getText().toString();

              mAuth = FirebaseAuth.getInstance();

              mAuth.createUserWithEmailAndPassword(email,password)
                      .addOnCompleteListener(MainActivity.this, new OnCompleteListener<AuthResult>() {
                          @Override
                          public void onComplete(@NonNull Task<AuthResult> task) {
                              if (task.isSuccessful()) {

                                  FirebaseDatabase database = FirebaseDatabase.getInstance();
                                  DatabaseReference myRef = database.getReference();

                             String uid = FirebaseAuth.getInstance().getCurrentUser().getUid().toString();


                                  Smodel smodel = new Smodel(email,password,uid);

                                  myRef.child(uid).setValue(smodel);


                                  Toast.makeText(getApplicationContext(), "Registration successful!", Toast.LENGTH_LONG).show();



                              } else {




                              }
                          }
                      });

          }
      });
    }
}

2.

package abhiandroid.com.practice;

public class Smodel
{
    String email,password, uid;

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUid() {
        return uid;
    }

    public void setUid(String uid) {
        this.uid = uid;
    }

    public Smodel(String email, String password, String uid) {
        this.email = email;
        this.password = password;
        this.uid = uid;


    }
}

3.Firebase Login

package abhiandroid.com.practice;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;

public class MainActivity3 extends AppCompatActivity {
//sing in;
    EditText email1, password2;
    Button button;
    FirebaseAuth mAuth;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        email1 = findViewById(R.id.email);
        password2 = findViewById(R.id.password);
        button = findViewById(R.id.button);


        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Login();

            }
            private void Login() {

                String email, password;
                email = email1.getText().toString();
                password = password2.getText().toString();

                mAuth = FirebaseAuth.getInstance();

                mAuth.signInWithEmailAndPassword(email,password)
                        .addOnCompleteListener(MainActivity3.this, new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                if (task.isSuccessful()) {

                                    Toast.makeText(getApplicationContext(),
                                            "Login successful!!", Toast.LENGTH_LONG).show();


                                } else {



                                }
                            }
                        });



            }
        });



    }
}

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