@POST(URLConstant.URL_PATH)  Flowable<UploadImgBean> upload(@Body RequestBody Body);

private static RetrofitInterface getRetrofitInterface(String baseUrl) {    if (retrofitInterface == null) {      Retrofit retrofit = new Retrofit.Builder()          .baseUrl(baseUrl)          .addConverterFactory(GsonConverterFactory.create())//        .addConverterFactory(ScalarsConverterFactory.create()) //string          .addCallAdapterFactory(RxJava2CallAdapterFactory.create())          .build();      retrofitInterface = retrofit.create(RetrofitInterface.class);    }    return retrofitInterface;  }

 public static Flowable<UploadImgBean> upload(List<File> fileList) {    //構(gòu)建body//addFormDataPart()第一個參數(shù)為表單名字，這是和后臺約定好的    MultipartBody.Builder builder = new MultipartBody.Builder()        .setType(MultipartBody.FORM)        .addFormDataPart("username", "name")         .addFormDataPart("phone", "phone")   //注意，file是后臺約定的參數(shù)，如果是多圖，file[]，如果是單張圖片，file就行    for (File file : fileList) {      //這里上傳的是多圖      builder.addFormDataPart("file[]", file.getName(), RequestBody.create(MediaType.parse("image/*"), file));    }    RequestBody requestBody = builder.build();    return getRetrofitInterface(URLConstant.URL_BASE).upload(requestBody);  }

HttpUtils.upload(mUploadFileList)        .subscribeOn(Schedulers.io())        .observeOn(AndroidSchedulers.mainThread())        .subscribe(new DisposableSubscriber<UploadImgBean>() {          @Override          public void onNext(UploadImgBean uploadImgBean) {            Log.i(TAG, "onNext: " );             }          }          @Override          public void onError(Throwable throwable) {            Log.i(TAG, "onError: --->" + throwable.getMessage());          }          @Override          public void onComplete() {            Log.i(TAG, "onComplete: ");          }        });