Login & Register Model App 🔐📲

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Project 🎯

This Android app provides a Login & Register Model App using Firebase Authentication (Email/Password). It includes Login Screen, Register Screen, and Home Dashboard. The app is designed with a modern, responsive UI, interactive clickable links, custom drawables, and reusable components. Perfect for learning authentication flows and Android UI best practices.

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App Layout 🎨

Login Screen

• Email and Password input fields with icons, padding, and rounded corners.
• Sign In button: blue (#2196F3), full-width, elevated (8dp), corner radius (10dp).
• Clickable "Sign up" link to navigate to Register screen.

Register Screen

• Similar styling to Login screen.
• Sign Up button with same design.
• Clickable "Sign in" link to navigate to Login screen.
• Firebase handles account creation and validation.

Home Screen

• Placeholder dashboard for post-login content.
• Fully responsive.
• Ready to add navigation drawer, tabs, or app features.

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Features ✨

Feature	Description
Login/Register	Email/password authentication using Firebase
Input Validation	Check for empty fields, correct email format
Toast Messages	Descriptive feedback for success/error
Clickable Links	Navigate between Login/Register screens
Custom Drawables	Rounded corners, 1dp stroke (#A9A9A9), 10dp padding
Styled Buttons	Blue (#2196F3), white text, elevation, corner radius
Responsive	Works on phones and tablets
Exported Login Activity	App entry point ready for deep linking
Modular Design	Easy to maintain and expand
Home Screen	Placeholder for navigation drawer, profile info, or tabs

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Firebase Integration 🔐

• Email/Password Authentication
• User creation, login, and error handling
• Ready for future expansion:
• • Remember login
  • Password reset
  • Email verification
  • Social OAuth login (Google, Facebook, etc.)

Code register example

auth.createUserWithEmailAndPassword(email, password)
    .addOnCompleteListener { task ->
        if (task.isSuccessful) {
            Toast.makeText(this, "Registered successfully!", Toast.LENGTH_SHORT).show()
            startActivity(Intent(this, Login::class.java))
            finish()
        } else {
            Toast.makeText(this, "Error: ${task.exception?.message}", Toast.LENGTH_SHORT).show()
        }
    }

Code login example

auth.signInWithEmailAndPassword(email, password)
    .addOnCompleteListener { task ->
        if (task.isSuccessful) {
            Toast.makeText(this, "Login successfully!", Toast.LENGTH_SHORT).show()
            val intent = Intent(this, Home::class.java)
            startActivity(intent)
            finish()
        } else {
            Toast.makeText(this, "Erro: ${task.exception?.message}", Toast.LENGTH_LONG).show()
        }
    }

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Technologies Used 🤖🍏

• Programming Language: Kotlin
• Development Environment: Android Studio
• Firebase Authentication: Email/Password login
• UI Components: ConstraintLayout, LinearLayout, TextView, EditText, Button
• Custom Drawables: Rounded rectangle with stroke and padding, and icons 24x24 .svg of email and password
• Target Platform: Android Mobile Devices

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Best Practices ✅

• Modular and maintainable activity structure
• Reusable XML styles for EditText and Buttons
• Input validation for security and UX
• Edge-to-edge layout for modern immersive design
• Responsive and adaptive to different screen sizes
• Clickable spans for interactive links

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Code Author 💻👨‍💻

fun main() {
    println("Code by Lucas Samuel Dias!")
    println("Welcome to the Login & Register Model App!")
}