Yoda Response: Certainly, Avi. One complex problem I encountered while working with AOSP was during the development of a custom Android HMI for an automotive client at Quest Global. The challenge was to integrate a new phonebook feature that needed to sync seamlessly with various mobile devices and display contacts efficiently on the car's dashboard.

The main issues were:
1. **Compatibility**: Ensuring compatibility with different versions of Android and various mobile devices.
2. **Performance**: Maintaining high performance despite the heavy data synchronization involved.
3. **User Experience**: Providing a smooth and intuitive user experience on the HMI.

To solve these problems, I took the following steps:
1. **Customizing System Services**: I customized the Android system services to handle the specific requirements of the phonebook feature. This involved modifying the ContactsProvider and SyncAdapter to ensure efficient data synchronization.
2. **Optimizing Performance**: I used Kotlin Coroutines to manage asynchronous tasks, which helped in handling large data sets without blocking the main thread. Additionally, I implemented efficient data caching mechanisms to reduce the load on the system.
3. **User Interface Design**: Worked closely with the UX/UI team to design an intuitive interface that allowed users to easily access and manage their contacts. We conducted usability tests to refine the interface based on user feedback.
4. **Testing and Debugging**: Conducted extensive testing on various hardware and software configurations to ensure compatibility and performance. Used tools like ADB and Android Studio Profiler to identify and fix any issues.

By addressing these challenges systematically, we were able to deliver a robust and user-friendly phonebook feature that met the client's requirements and provided a seamless experience for the end-users.