Class Diagrams for Mobile App

I need class diagrams for an open-source mobile application assignment. The project is built using Java

Requirements:
- Class diagrams should accurately represent the application's structure.
- Focus on core components and relationships.
- Clarity and precision are essential.

Ideal Skills:
- Proficiency in Java
- Experience with UML and class diagrams
- Familiarity with mobile application architecture
-ASAP


Please provide samples of similar work.