从Android应用上传图片到服务器时出错

Question

我无法上传设备本身拍摄的图像/照片，但是，它可以与屏幕截图和其他图像一起使用。我从画廊中选择了位图。我的上传功能：

private void uploadImage(){

        class UploadImage extends AsyncTask<Bitmap,Void,String>{


            RequestHandler rh = new RequestHandler();

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                loading = ProgressDialog.show(MainActivity.this, "Uploading Image", "Please wait...",true,true);
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                loading.dismiss();
                Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
            }

            @Override
            protected String doInBackground(Bitmap... params) {
                Bitmap bitmap = params[0];
                String uploadImage = getStringImage(bitmap);

                HashMap<String,String> data = new HashMap<>();
                data.put(UPLOAD_KEY, uploadImage);

                String result = rh.sendPostRequest(UPLOAD_URL,data);

                return result;
            }
        }

        UploadImage ui = new UploadImage();
        ui.execute(bitmap);
    }

它似乎不是由图像的大小或扩展引起的。可能是问题的原因是什么？还需要添加哪些附加代码？谢谢。

编辑。我的帖子请求方法。当我从画廊中选择图像时，它就会出现问题＆＃34;错误注册＆＃34;

public String sendPostRequest(String requestURL,
                                  HashMap<String, String> postDataParams) {

        URL url;
        String response = "";
        try {
            url = new URL(requestURL);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(15000);
            conn.setConnectTimeout(15000);
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);


            OutputStream os = conn.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));
            writer.write(getPostDataString(postDataParams));

            writer.flush();
            writer.close();
            os.close();
            int responseCode = conn.getResponseCode();
            System.out.print(responseCode);
            if (responseCode == HttpURLConnection.HTTP_OK) {
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                response = br.readLine();
            } else {
                response = "Error Registering";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return response;
    }