Create Firebase Login And Registation Form using Android Java

activity_login.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=".LoginActivity"
    android:padding="25dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="52dp"
        android:layout_marginEnd="100dp"
        android:text="Login Page"
        android:textSize="38sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="44dp"
        android:ems="10"
        android:inputType="textEmailAddress"
        android:hint="email address"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        tools:layout_editor_absoluteX="100dp"
        tools:ignore="MissingConstraints" />

    <EditText
        android:id="@+id/pass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="password"
        app:layout_constraintBottom_toTopOf="@+id/log"
        app:layout_constraintTop_toBottomOf="@+id/email"
        app:layout_constraintVertical_bias="0.527"
        tools:layout_editor_absoluteX="34dp" />

    <Button
        android:id="@+id/log"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="340dp"
        android:text="Login"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.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=".MainActivity"
    android:padding="20dp">

    <TextView
        android:id="@+id/login_form"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="Registration Form"
        android:textSize="32sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/first_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="28dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="first name : "
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/login_form" />

    <EditText
        android:id="@+id/last_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="last name :"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/first_name" />

    <EditText
        android:id="@+id/email_address"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:inputType="textEmailAddress"
        android:hint="email address :"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/last_name" />

    <EditText
        android:id="@+id/mobile_number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:ems="10"
        android:inputType="number"
        android:hint="mobile number"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/email_address" />

    <EditText
        android:id="@+id/password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="password"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/mobile_number" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="152dp"
        android:layout_marginTop="48dp"
        android:backgroundTint="#506783"
        android:text="Register"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/password" />


</androidx.constraintlayout.widget.ConstraintLayout>

LoginActivity.java

package com.example.login;

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.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;

public class LoginActivity extends AppCompatActivity {

    EditText email, password;
    Button login;
    DatabaseReference databaseReference;

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

        email = findViewById(R.id.email);
        password = findViewById(R.id.pass);

        login = findViewById(R.id.log);

        databaseReference = FirebaseDatabase.getInstance().getReference("Login");

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String mail = email.getText().toString();
                String pass = password.getText().toString();
                System.out.println(mail + " " + pass);

                databaseReference.addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot snapshot) {

                        for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
//                            System.out.println(dataSnapshot.child("email_address").getValue().toString() + " " + dataSnapshot.child("password").getValue().toString());
                            if (dataSnapshot.child("email_address").getValue().equals(mail) && dataSnapshot.child("password").getValue().equals(pass)) {
                                System.out.println(dataSnapshot.child("email_address").getValue().toString() + " " + dataSnapshot.child("password").getValue().toString());
                                Toast.makeText(LoginActivity.this, "Successfully login!", Toast.LENGTH_LONG).show();
//
                            }
                        }
                    }

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

                    }
                });
            }
        });
    }
}

MainActivity.java

package com.example.login;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
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.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class MainActivity extends AppCompatActivity {

    EditText first_name, last_name, email_address, mobile_number, password;
    Button register_button;
    DatabaseReference firebaseDatabase;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        first_name = findViewById(R.id.first_name);
        last_name = findViewById(R.id.last_name);
        email_address = findViewById(R.id.email_address);
        mobile_number = findViewById(R.id.mobile_number);
        password = findViewById(R.id.password);

        register_button = findViewById(R.id.button);

        firebaseDatabase = FirebaseDatabase.getInstance().getReference("Login");



        register_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                UserData userData = new UserData();
                userData.setFirst_name(first_name.getText().toString());
                userData.setLast_name(last_name.getText().toString());
                userData.setEmail_address(email_address.getText().toString());
                userData.setMobile_number(mobile_number.getText().toString());
                userData.setPassword(password.getText().toString());

                firebaseDatabase.push().setValue(userData).addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void unused) {
                        Toast.makeText(MainActivity.this, "Successfully Registered!", Toast.LENGTH_SHORT).show();
                        startActivity(new Intent(MainActivity.this,LoginActivity.class));
                    }
                });
            }
        });
    }
}

class UserData {
    String first_name, last_name, email_address, mobile_number, password;

    public UserData() {
    }

    public UserData(String first_name, String last_name, String email_address, String mobile_number, String password) {
        this.first_name = first_name;
        this.last_name = last_name;
        this.email_address = email_address;
        this.mobile_number = mobile_number;
        this.password = password;
    }

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public String getEmail_address() {
        return email_address;
    }

    public void setEmail_address(String email_address) {
        this.email_address = email_address;
    }

    public String getMobile_number() {
        return mobile_number;
    }

    public void setMobile_number(String mobile_number) {
        this.mobile_number = mobile_number;
    }

    public String getPassword() {
        return password;
    }

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