Changing API

Let us extend the API with more functionality: we want to let clients specify a list of lines for the birthday card:

1. package com.example.birthdayservice;

3. /** Birthday service interface. */
4. interface IBirthdayService {
5. /** Generate a Happy Birthday message. */
6. String wishHappyBirthday(String name, int years, in String[] text);
7. }

This results in an updated trait definition for IBirthdayService:

1. trait IBirthdayService {
2. fn wishHappyBirthday(
3. &self,
4. name: &str,
5. years: i32,
6. text: &[String],
7. ) -> binder::Result<String>;
8. }
  • Note how the String[] in the AIDL definition is translated as a &[String] in Rust, i.e. that idiomatic Rust types are used in the generated bindings wherever possible:
  • in array arguments are translated to slices.
  • out and inout args are translated to &mut Vec<T>.
  • Return values are translated to returning a Vec<T>.