Android App with Google Login

I need a foundational Android app codebase with Google Signup and Signin, using the latest Credential Manager in Java.

Requirements:
- Implement Google Signup and Signin with Credential Manager
- Collect user information: Email address, Profile picture, Phone number
- Follow Google's default design for authentication screens
- Build and test functionality
- Provide complete Java codebase for initial app setup

Ideal Skills:
- Proficiency in Java and Android development
- Experience with Google Authentication and Credential Manager
- Familiarity with app design principles

Looking for clean, functional, and secure code.