Here is an answer to the Android interview question "When would you use AIDL?":
AIDL (Android Interface Definition Language) is used when you want to create an interface for inter-process communication (IPC) between an Android app and another process, such as a service running in the same app or a service running in a different app.
You would use AIDL in the following situations:
When Communicating Between an App and a Service
If your app has a service that needs to communicate with the main app process or other components, you can use AIDL to define the interface for this communication.
The service can expose methods that the app can call to interact with the service.
When Communicating Between Apps
If you have two separate Android apps that need to communicate with each other, you can use AIDL to define a shared interface.
One app would implement the AIDL interface in a service,...
