在Android的POST Multipart中添加数据（字符串）和图像

Question

我需要在多部分Android POST数据中添加电子邮件以及图像。 我能够成功发布图像，但无法在发布请求中将电子邮件字符串与图像一起添加。 请帮忙。

  try {
            FileInputStream fileInputStream = new FileInputStream(sourceFile);
            URL url = new URL(UPLOAD_URL);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("ENCTYPE", "multipart/form-data");
            conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            conn.setRequestProperty("myFile", fileName);
            conn.setRequestProperty("email", email);


            dos = new DataOutputStream(conn.getOutputStream());

            dos.writeBytes(twoHyphens + boundary + lineEnd);
            dos.writeBytes("Content-Disposition: form-data; name=\"myFile\";filename=\"" + fileName + "\"" + lineEnd);
            dos.writeBytes(twoHyphens + boundary + twoHyphens);
            dos.writeBytes(lineEnd);

            dos.writeBytes(twoHyphens + boundary + lineEnd);
            dos.writeBytes("Content-Disposition: form-data; email=\"" + email + "\"" + lineEnd);
            dos.writeBytes(twoHyphens + boundary + twoHyphens);
            dos.writeBytes(lineEnd);

            bytesAvailable = fileInputStream.available();
            Log.i("Huzza", "Initial .available : " + bytesAvailable);

            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            buffer = new byte[bufferSize];

            bytesRead = fileInputStream.read(buffer, 0, bufferSize);