AIDL Client

Finally, we can create a Rust client for our new service.

birthday_service/src/client.rs:

# // Copyright 2024 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
use com_example_birthdayservice::aidl::com::example::birthdayservice::IBirthdayService::IBirthdayService;
use com_example_birthdayservice::binder;

{{#include ../birthday_service/src/client.rs:main}}
}

birthday_service/Android.bp:

{{#include ../birthday_service/Android.bp:birthday_client}}

Notice that the client does not depend on libbirthdayservice.

Build, push, and run the client on your device:

{{#include ../../build_all.sh:birthday_client}}

Happy Birthday Charlie, congratulations with the 60 years!

• Strong<dyn IBirthdayService> is the trait object representing the service that the client has connected to.
  • Strong is a custom smart pointer type for Binder. It handles both an in-process ref count for the service trait object, and the global Binder ref count that tracks how many processes have a reference to the object.
  • Note that the trait object that the client uses to talk to the service uses the exact same trait that the server implements. For a given Binder interface, there is a single Rust trait generated that both client and server use.
• Use the same service identifier used when registering the service. This should ideally be defined in a common crate that both the client and server can depend on.