API verÀndern

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

package com.example.birthdayservice; /** Birthday service interface. */ interface IBirthdayService { /** Generate a Happy Birthday message. */ String wishHappyBirthday(String name, int years, in String[] text); }

This results in an updated trait definition for IBirthdayService:

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

Speaker Notes

  • 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>.