xutils3批量上传文件

RequestParams params = new RequestParams(url);

params.addParameter("file", new File(file));
只能上传单张，不可能上传多张
于是采用for循环，
for（int i=0;i<fileList.size();i++）{
params.addParameter("file", new File(fileList.get(i)));
}

  params.setMultipart(true);
    x.http().post(params, new org.xutils.common.Callback.CacheCallback<String>() {
        @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
        @Override
        public void onSuccess(String s) {
            try {
                JSONObject obj = new JSONObject(s);
               
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onError(Throwable throwable, boolean b) {
            Toast.makeText(AttendanceActivity.this, "错误:" + throwable.getMessage(), Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onCancelled(CancelledException e) {

        }

        @Override
        public void onFinished() {

        }

        @Override
        public boolean onCache(String s) {
            return false;
        }
    });
}

multipart/data  刚好xutil3 有
MultipartBody这个类，所有就有了
File file = new File(upFileName);
    List<KeyValue> list = new ArrayList<KeyValue>();
    list.add(new KeyValue("file",file));
    MultipartBody body=new MultipartBody(list,"UTF-8");
    params.setRequestBody(body);
    params.setMultipart(true);
    x.http().post(params, new org.xutils.common.Callback.CacheCallback<String>() {
        @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
        @Override
        public void onSuccess(String s) {
            try {
                JSONObject obj = new JSONObject(s);
  
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onError(Throwable throwable, boolean b) {
            Toast.makeText(AttendanceActivity.this, "错误:" + throwable.getMessage(), Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onCancelled(CancelledException e) {

        }

        @Override
        public void onFinished() {

        }

        @Override
        public boolean onCache(String s) {
            return false;
        }
    });

    List<KeyValue> list = new ArrayList<KeyValue>();
    list.add(new KeyValue("file",file));
    MultipartBody body=new MultipartBody(list,"UTF-8");
    params.setRequestBody(body);