身份验证器，不正确地将 Java 转换为 Kotlin

Question

我正在尝试将大量 Java 代码转换为 Kotlin。

我在堆栈上找到了如何使用 OkHttp 设置身份验证：

 client.authenticator(new Authenticator() {
        @Override
        public Request authenticate(Route route, Response response) throws IOException {
            if (responseCount(response) >= 3) {
                return null; // If we've failed 3 times, give up. - in real life, never give up!!
            }
            String credential = Credentials.basic("name", "password");
            return response.request().newBuilder().header("Authorization", credential).build();
        }
    });

看起来很简单，但AndroidStudio翻译错了，类似于：

   client.authenticator(Authenticator { route, response ->
            if (responseCount(response) >= 3) {
                return@Authenticator null // If we've failed 3 times, give up. - in real life, never give up!!
            }
            val credential = Credentials.basic("name", "password")
            response.request().newBuilder().header("Authorization", credential).build()
        })

我收到错误“public open fun Authenticator() 的参数太多”

这里有什么问题？如何解决？在我看来，这在 Kotlin 中应该会有所不同。

Answer 1

你的 Kotlin 代码应该是这样的：

client.authenticator(object:Authenticator {
  @Throws(IOException::class)
  fun authenticate(route:Route, response:Response):Request {
    if (responseCount(response) >= 3)
    {
      return null // If we've failed 3 times, give up. - in real life, never give up!!
    }
    val credential = Credentials.basic("name", "password")
    return response.request().newBuilder().header("Authorization", 
credential).build()
  }
})

Answer 2

不，这本身就是一个正确的翻译，您可以在SAM Conversions 文档中查看示例。从错误来看，您可能在范围内还有其他东西，也称为Authenticator，因此您应该更明确地使用anonymous object，如 Randy Hall 的回答。