改寫 API

讓我們為這個 API 擴充更多功能：我們想要讓用戶能在生日卡上指定幾行字：

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>;
}
  • 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>.