Completed Application

This is the complete application code for the RoomDatabaseDemo application. You can view the code on my GitHub page and look at the chapter11/RoomDatabaseDemo project.

How this example renders

Above is just a snippet of the code to view the full code, you need to go to my GitHub page and look at the chapter11/RoomDatabaseDemo project.

The app is running and showing two notes.

The app editing a note.

The app deletion confirmation screen.

The app after a note was deleted.

Tips for Success

• Keep your project organized by separating data, UI, and logic.
• Always add the correct dependencies for Room and Compose.
• Test your app after each major change.
• Use ViewModels to keep your UI and data in sync.
• Read error messages carefully—they often tell you exactly what's wrong!

Common Mistakes to Avoid

• Forgetting to add the kapt plugin for Room.
• Not including all your entities in the @Database annotation.
• Mixing UI code and data logic in the same file.
• Not updating the database version when you change the schema.

Best Practices

• Use clear, meaningful names for files and classes.
• Keep each file focused on a single job.
• Follow the MVVM (Model-View-ViewModel) pattern for clean code.
• Document your code and project structure for future reference.