我们的团队决定采用Retrofit 2.0,我正在做一些初步的研究.我是这个图书馆的新手.

我想知道如何使用拦截器通过我们的Android应用程序中的Retrofits 2.0添加自定义标头.关于使用拦截器在Retrofit 1.X中添加标头有很多tutorials,但由于API在最新版本中发生了很大的变化,我不确定如何在新版本中调整这些方法.此外,Retrofit尚未更新其新文档.

例如,在以下代码中,我应该如何实现Interceptor类来添加额外的头文件？此外,undocumented Chain object究竟是什么？何时会调用intercept()？

    OkHttpClient client = new OkHttpClient();
    client.interceptors().add(new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Response response = chain.proceed(chain.request());

            // How to add extra headers?

            return response;
        }
    });

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_API_URL)
            .client(client)
            .addConverterFactory(GsonConverterFactory.create())
            .build();

解决方法:

看一下这个.

public class HeaderInterceptor
        implements Interceptor {
    @Override
    public Response intercept(Chain chain)
            throws IOException {
        Request request = chain.request();
        request = request.newBuilder()
                .addHeader("appid", "hello")
                .addHeader("deviceplatform", "android")
                .removeHeader("User-Agent")
                .addHeader("User-Agent", "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0")
                .build();
        Response response = chain.proceed(request);
        return response;
    }
}

科特林

class HeaderInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response = chain.run {
        proceed(
            request()
                .newBuilder()
                .addHeader("appid", "hello")
                .addHeader("deviceplatform", "android")
                .removeHeader("User-Agent")
                .addHeader("User-Agent", "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0")
                .build()
        )        
    }
}