Progress bar for Multipart uploading with multiple files Android

Question

Edit: solved, scroll down ;)

Following the tutorial here,

I implemented a progress bar dialog within an AsyncTask to show the percentage of data uploaded. Currently it is just showing from 0% to 100%, then it gets stuck at 100% until all the data are uploaded. I am trying to upload a Json string plus 4 images.

Code:

 private class UploaderTask extends AsyncTask<JSONArray, Integer, String> {

    private ProgressDialog dialog;
    protected Context mContext;
    long totalSize;

    public UploaderTask(Context context) {

        mContext = context;
    }

    @Override
    protected void onPreExecute() {

        dialog = new ProgressDialog(mContext);
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        dialog.setTitle("Uploading data");
        dialog.setCancelable(false);
        //dialog.setIndeterminate(true);
        dialog.setMessage("Please wait...");
        dialog.show();
        //dialog.setProgress(0);

    }

    @Override
    public String doInBackground(JSONArray... json) {

        String responseMessage = "";
        int counter = 0;

        try {

            CustomMultiPartEntity entity = new CustomMultiPartEntity(new ProgressListener() {
                @Override
                public void transferred(long num) {
                    publishProgress((int) ((num / (float) totalSize) * 100));
                }
            });

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(URL);

            //convert JSON array to String (first element contains the whole of data)
            String json_encoded_string = json[0].toString();

            //add json data
            entity.addPart("json", new StringBody(json_encoded_string));

            //get all images plus data and add them to the Multipart Entity

            for (images_cursor.moveToFirst(); !images_cursor.isAfterLast(); images_cursor.moveToNext()) {

                counter++;

                //Get image and convert to byte array
                byte[] image_ba = images_cursor.getBlob(images_cursor.getColumnIndex("image"));
                long image_unit_id = images_cursor.getLong(images_cursor.getColumnIndex("unit_id"));
                String image_caption = images_cursor.getString(images_cursor.getColumnIndex("caption"));

                //add image to multipart
                entity.addPart("image" + counter, new ByteArrayBody(image_ba, "image" + counter + ".jpg"));

                //add unit _id to multipart
                entity.addPart("image_unit_id" + counter, new StringBody(String.valueOf(image_unit_id)));

                //add caption to multipart
                entity.addPart("image_caption" + counter, new StringBody(String.valueOf(image_caption)));

            }

                            totalSize = entity.getContentLength();
            httppost.setEntity(entity);

            HttpResponse response = httpclient.execute(httppost);
            InputStream inputStream = response.getEntity().getContent();
            responseMessage = inputStreamToString(inputStream);

            //log out response from server
            longInfo(responseMessage);

        }
        //show error if connection not working
        catch (SocketTimeoutException e) {
            e.printStackTrace();
            responseMessage = "unreachable";

        }

        catch (ConnectTimeoutException e) {
            e.printStackTrace();
            responseMessage = "unreachable";

        }

        catch (Exception e) {
            e.printStackTrace();
            responseMessage = "unreachable";

        }

        return responseMessage;
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        dialog.setProgress((int) (progress[0]));
    }

    @Override
    protected void onPostExecute(String result) {

        //result is the response back from "doInBackground"
        dialog.cancel();

        TextView response_holder = (TextView) findViewById(R.id.response);

        //check if there were errors upoloading
        if (result.equalsIgnoreCase("unreachable")) {
            response_holder.setText("Error while uploading...Please check your internet connection and retry.");
            return;
        }

        if (result.equalsIgnoreCase("error saving project data")) {
            response_holder.setText("There was an error on the server saving the project data, please retry.");
            return;
        }

        if (result.equalsIgnoreCase("error saving sites data")) {
            response_holder.setText("There was an error on the server saving the sites data, please retry.");
            return;
        }

        if (result.equalsIgnoreCase("project saved")) {
            response_holder.setText("Data uploaded successfully!");
            return;
        }

        if (result.equalsIgnoreCase("project already exist")) {
            response_holder.setText("This project already exist!");
            return;
        }

    }

 }

I am guessing it is just calculating the total size of the json string since it is the first part...any suggestions?

Edit: possible duplicate, still with no solution here

Edit: solved adding totalSize = entity.getContentLength(); before posting the entity, code has been updated

Answer 1

Look at this bit of code:

@Override
protected void onProgressUpdate(Integer... progress) {
    dialog.setProgress((int) (progress[0]));
}

Essentially, you are only caring about the first progress value. That's fine as there is probably only one from your code. But you could publish the progress by adding publishProgress statements to your code. This could be done by pushing a percentage each time you are done with something, like this:

     int progress_done=20;
     publishProgress(progress_done);
     for (images_cursor.moveToFirst(); !images_cursor.isAfterLast(); images_cursor.moveToNext()) {

            counter++;

            //Get image and convert to byte array
            byte[] image_ba = images_cursor.getBlob(images_cursor.getColumnIndex("image"));
            long image_unit_id = images_cursor.getLong(images_cursor.getColumnIndex("unit_id"));
            String image_caption = images_cursor.getString(images_cursor.getColumnIndex("caption"));

            //add image to multipart
            entity.addPart("image" + counter, new ByteArrayBody(image_ba, "image" + counter + ".jpg"));

            //add unit _id to multipart
            entity.addPart("image_unit_id" + counter, new StringBody(String.valueOf(image_unit_id)));

            //add caption to multipart
            entity.addPart("image_caption" + counter, new StringBody(String.valueOf(image_caption)));

            progress_done+=20;
            publishProgress(progress_done);
        }