Retrofit添加公共请求参数以及添加自定义的ConverterFactory

public class HttpBaseInterceptor implements Interceptor {

@Override
public Response intercept(Chain chain) throws IOException {
Request oldRequest = chain.request();
// 添加新的参数
HttpUrl.Builder authorizedUrlBuilder = oldRequest.url()
.newBuilder()
.scheme(oldRequest.url().scheme())
.host(oldRequest.url().host());
Request.Builder builder = oldRequest.newBuilder()
.method(oldRequest.method(), oldRequest.body());

authorizedUrlBuilder.addQueryParameter("salt", UserService.getInstance().getSalt());
authorizedUrlBuilder.addQueryParameter("user_id", UserService.getInstance().getUserid());

// 新的请求
Request newRequest = builder.url(authorizedUrlBuilder.build()).build();
Response response;
try {
response = chain.proceed(newRequest);
} catch (Exception e) {
throw e;
}
//这个是因为，如果请求下载链接的话，会导致无法获取response
BufferedSource source = response.body().source();
source.request(Long.MAX_VALUE);
return response;

}
}

public class StringConverterFactory extends Converter.Factory {
public static StringConverterFactory create() {
return new StringConverterFactory();
}

@Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
//Retrofit并不是自动去判断返回的类型，依旧是需要指定的，能处理就处理，不能处理就返回null
if(type==String.class){
return new Converter<ResponseBody, String>() {
@Override
public String convert(ResponseBody value) throws IOException {
return value.string();
}
};
}else return null;
}
}