comprehensive-rust/src/android/aidl/example-service/service-bindings.md

Generated Service API

Binder generates a trait for each interface definition.

birthday_service/aidl/com/example/birthdayservice/IBirthdayService.aidl:

{{#include ../birthday_service/aidl/com/example/birthdayservice/IBirthdayService.aidl:IBirthdayService}}
}

out/soong/.intermediates/.../com_example_birthdayservice.rs:

trait IBirthdayService {
    fn wishHappyBirthday(&self, name: &str, years: i32) -> binder::Result<String>;
}

Your service will need to implement this trait, and your client will use this trait to talk to the service.

• Point out how the generated function signature, specifically the argument and return types, correspond the interface definition.
  • String for an argument results in a different Rust type than String as a return type.