Program 15 (Firebase):
Firebase dependencies setup:
Will vary depending upon your android studio version (refer youtube/google for linking
android studio with firebase)
Firebase Email/Password Creation in Firebase:
Code:
activity_main.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:id="@+id/main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity"
 android:orientation="vertical"
 android:layout_margin="100px">
 <EditText
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="Enter Username"
 android:id="@+id/username"
 android:inputType="textEmailAddress"/>
 <EditText
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="Enter Password"
 android:id="@+id/password"
 android:inputType="textPassword"/>
 <Button
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/btnlogin"
 android:text="Login"/>
</LinearLayout>
MainActivity.java
package com.example.ftest1;
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 androidx.activity.EdgeToEdge;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
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.ktx.Firebase;
public class MainActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 EdgeToEdge.enable(this);
 setContentView(R.layout.activity_main);
 ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
 Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
 v.setPadding(systemBars.left, systemBars.top, systemBars.right,
systemBars.bottom);
 return insets;
 });
 EditText username = findViewById(R.id.username);
 EditText password = findViewById(R.id.password);
 Button btnlogin = findViewById(R.id.btnlogin);
 FirebaseAuth mAuth = FirebaseAuth.getInstance();
 FirebaseUser mUser = mAuth.getCurrentUser();
 btnlogin.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 String email = username.getText().toString();
 String pass = password.getText().toString();
 mAuth.signInWithEmailAndPassword(email,pass).addOnCompleteListener(new
OnCompleteListener<AuthResult>() {
 @Override
 public void onComplete(@NonNull Task<AuthResult> task) {
 if(task.isSuccessful()){
 Toast.makeText(MainActivity.this, "Correct",
Toast.LENGTH_SHORT).show();
 Intent intent = new Intent(MainActivity.this,Personal_Details.class);
 startActivity(intent);
 }else{
 Toast.makeText(MainActivity.this, "Incorrect",
Toast.LENGTH_SHORT).show();
 }
 }
 });
 }
 });
 }
}
Activity_personal_details.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:id="@+id/main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".Personal_Details"
 android:orientation="vertical"
 android:layout_margin="100px">
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="Name: Priyan"/>
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="Age: 21"/>
 <TextView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="(you can add more personal details if required)"/>
 <TextView
 android:id="@+id/btnback"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:text="Go Back"
 android:layout_marginTop="100px"
 android:textColor="#FF0000" />
</LinearLayout>
Personal_Details.java (Note: Write this code only if you want to go back to login page
i.e MainActivity.java)
package com.example.ftest1;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
public class Personal_Details extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 EdgeToEdge.enable(this);
 setContentView(R.layout.activity_personal_details);
 ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
 Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
 v.setPadding(systemBars.left, systemBars.top, systemBars.right,
systemBars.bottom);
 return insets;
 });
 TextView btnback = findViewById(R.id.btnback);
 btnback.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 Intent intent2 = new Intent(Personal_Details.this,MainActivity.class);
 startActivity(intent2);
 }
 });
 }
}