Retrofit2 封装统一请求参数

Android http请求中，通常每个request都有相同的参数，比如，token，uid等等，如何能一次性封装这些重复参数呢

本文的目的就是解决重复封装的梗，而解决这个问题的主要助手就是Interceptor(拦截器)

• 自定义Interceptor

public class BaseInterceptor implements Interceptor {   
 @Override    
public Response intercept(Chain chain) throws IOException { 
       Request original = chain.request();    
//添加请求参数，此处是以豆瓣api为例，下面会贴出Base_url
       HttpUrl url=original.url().newBuilder()  
                .addQueryParameter("count", "5")    
                .addQueryParameter("start", "0")          
                .build();   
//添加请求头
      Request request = original.newBuilder()     
               .addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")         
               .addHeader("Connection", "keep-alive")    
               .method(original.method(), original.body())   
               .url(url)   
              .build();     
      return chain.proceed(request); 
   }}

• 使用BaseInterceptor

public static final String BASE_URL = "https://api.douban.com/v2/movie/";
//此类Http工具类
public HttpClient() {   
     OkHttpClient.Builder client = new OkHttpClient.Builder();   
     client.connectTimeout(5, TimeUnit.SECONDS);    
     client.addInterceptor(new BaseInterceptor());   
     retrofit = new Retrofit.Builder().
        baseUrl(BASE_URL)
        .client(client.build())
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .build();  
     service = retrofit.create(MovieService.class);
}
-
  //此类 retrofit api service
   public interface MovieService { 
     @POST("in_theaters")    
     Observable>> getMovie();
}

亲测可以使用，返回结果 count=5