Android http請求中，通常每個request都有相同的引數，比如，token，uid等等，如何能一次性封裝這些重複引數呢

本文的目的就是解決重複封裝的梗，而解決這個問題的主要助手就是Interceptor(攔截器)

• 自定義Interceptor

public class BaseInterceptor implements Interceptor {   
 @Override    
public Response intercept(Chain chain) throws IOException { 
       Request original = chain.request();    
//新增請求引數，此處是以豆瓣api為例，下面會貼出Base_url
 

       HttpUrl url=original.url().newBuilder()  
                .addQueryParameter("count", "5")    
                .addQueryParameter("start", "0")          
                .build();   
//新增請求頭
      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/"
 
;
//此類Http工具類
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);
}
-
  //此類 retrofit api service
   public interface MovieService { 
     @POST("in_theaters")    
     Observable<BaseResponse<List<MovieResponse>>> getMovie();
}

親測可以使用，返回結果 count=5