android - 如何在从字节数组上传数据到 PHP 服务器时获取上传进度？

Question

我将图像文件从设备上传到 PHP 服务器，方法是将文件转换为字节数组。我在我的应用程序中使用 android-async-http-1.3.1.jar 将文件上传到服务器。

http://loopj.com/android-async-http/

我想要的是在进度条上显示已上传字节数组的字节数。现在，问题是，在上传过程中，我如何才能知道上传了多少字节。在想法/示例/代码问题上需要帮助。提前谢谢大家。

Answer 1

终于，我做到了。我在 AsyncTask 类中使用文件输入/输出流完成了此操作。下面，我给出了上传文件并在进度条中显示的代码......

class ImageUploadTask extends AsyncTask<Void, Void, String> {

    @Override
    protected void onPreExecute() {
        pb.setVisibility(View.VISIBLE);

    }


    @Override
    protected String doInBackground(Void... unused) {

        String twoHyphens = "--";
        String boundary = "*****" + Long.toString(System.currentTimeMillis()) + "*****";
        String lineEnd = "\r\n";

        try
        {
            FileInputStream fileInputStream = new FileInputStream(new     File(pathToOurFile));

            URL url = new URL(urlServer);
            connection = (HttpURLConnection) url.openConnection();

            // Allow Inputs & Outputs
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);

            // Enable POST method
            connection.setRequestMethod("POST");

            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type",     "multipart/form-data;boundary="+boundary);

            outputStream = new DataOutputStream(     connection.getOutputStream() );
            outputStream.writeBytes(twoHyphens + boundary + lineEnd);
            outputStream.writeBytes("Content-Disposition: form-data;     name=\"image\";filename=\"" + pathToOurFile +"\"" + lineEnd);
            outputStream.writeBytes(lineEnd);

            bytesAvailable = fileInputStream.available();
            Log.v("Size",bytesAvailable+"");

            pb.setProgress(0);
            pb.setMax(bytesAvailable);
            //Log.v("Max",pb.getMax()+"");

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


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

            while (bytesRead > 0)
            {
                outputStream.write(buffer, 0, bufferSize);

                bytesAvailable = fileInputStream.available();
                Log.v("Available",bytesAvailable+"");

                publishProgress();

                bufferSize = Math.min(bytesAvailable,     maxBufferSize);
                bytesRead = fileInputStream.read(buffer, 0,      bufferSize);
            }

            outputStream.writeBytes(lineEnd);
            outputStream.writeBytes(twoHyphens + boundary + twoHyphens     + lineEnd);

            // Responses from the server (code and message)
            serverResponseCode = connection.getResponseCode();
            serverResponseMessage = connection.getResponseMessage();
            System.out.println(serverResponseMessage);

            fileInputStream.close();
            outputStream.flush();
            outputStream.close();

        }
        catch (Exception ex)
        {
        //Exception handling
        }

        //publishProgress();

        return null;

    }

    @Override
    protected void onProgressUpdate(Void... unsued) {
        super.onProgressUpdate(unsued);

        pb.setProgress(pb.getMax()-bytesAvailable);

    }

    @Override
    protected void onPostExecute(String sResponse) {

        //if(pb.getProgress()>= pb.getMax())
        pb.setVisibility(View.INVISIBLE);

    }
}