上傳檔案注意：
使用KeyValue物件進行新增檔案操作

        int uid = 2;

//普通欄位的儲存
        requestParams.addBodyParameter("uid", String.valueOf(uid));
        requestParams.addBodyParameter("content", context);

//建立keyValue集合進行儲存File
        List<KeyValue> list = new ArrayList<>();

        if (mImagePathList !=
 
 null && mImagePathList.size() > 1) {
            Log.e("Activity", "需要執行上傳檔案功能");

            for (String imgPath : mImagePathList) {
                if (imgPath.equals(IMG_ADD_TAG)) {
                    continue;
                }

                File file = new File(imgPath);
                list
 
.add(new KeyValue("file", file));


        }

        MultipartBody body = new MultipartBody(list, "UTF-8");

        requestParams.setRequestBody(body);