我想尝试在Gmail中显示图片，同时将其嵌入为图片文件。但是，该图像不会显示所拍摄的照片。

在savefile中，我尝试保存文件。 在createfile中，我尝试为要存储的文件创建路径。 在try部分中，我尝试引用multimessage方法，该方法会将部分（包括图像）添加到mulitpart中，并返回到try中，然后发送给接收者。

private void savefile(File file,Bitmap bitmap) throws IOException {
        FileOutputStream outstream;
        outstream = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.PNG,100,outstream);
        outstream.flush();
        outstream.close();
    }

    private File createfile() {
        String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imagefilename = "Complaint"+timestamp+"_";
        File storedir = getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File file = null;
        try {
            file = File.createTempFile(imagefilename,".png",storedir);
        } catch (IOException e) {
            Log.d( "mylog","Excep : " + e.toString());

        }
        return file;
    }

try {

            Message message = new MimeMessage(session);
            message.setfrom(new Internetaddress(username));
            message.setRecipients(Message.RecipientType.TO,Internetaddress.parse("mailaddress"));
            message.setSubject(subjectEdit.getText().toString());
            //message.setText(messageEdit.getText().toString());
            message.setContent(multimessage(createfile()));

            new SendMailTask().execute(message);

        }   catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }

    private Multipart multimessage(File file) throws MessagingException {

        MimeMultipart multipart = new MimeMultipart("related");
        BodyPart messagebodypart = new MimeBodyPart();


        String htmlText = "<img src=\"file\">";

        multipart.addBodyPart(messagebodypart);

        DataSource filedatasource = new FileDataSource(file);
        messagebodypart.setDataHandler(new DataHandler(filedatasource));
        messagebodypart.setHeader("content-ID","file");

        multipart.addBodyPart(messagebodypart);
        messagebodypart = new MimeBodyPart();
        messagebodypart.setContent(htmlText,"text/html");
        multipart.addBodyPart(messagebodypart);

        return multipart;
    }