simple HttpURLConnection POST file multipart/form-data from android to google blobstore

Question

I have very little idea how html works.What i want to do is exactly similar to the following but on android

Answer 1

Volley is a good http library for multipart data. AndroidMultiPartEntity class is for progress listener.

    public class AndroidMultiPartEntity extends MultipartEntity

    {

    private final ProgressListener listener;

    public AndroidMultiPartEntity(final ProgressListener listener) {
    super();
    this.listener = listener;
    }

    public AndroidMultiPartEntity(final HttpMultipartMode mode, final ProgressListener listener) {
    super(mode);
    this.listener = listener;
    }

    public AndroidMultiPartEntity(HttpMultipartMode mode, final String boundary,
    final Charset charset, final ProgressListener listener) {
    super(mode, boundary, charset);
    this.listener = listener;
    }

    @Override
    public void writeTo(final OutputStream outstream) throws IOException {
    super.writeTo(new CountingOutputStream(outstream, this.listener));
    }

    public static interface ProgressListener {
    void transferred(long num);
    }

    public static class CountingOutputStream extends FilterOutputStream {

    private final ProgressListener listener;
    private long transferred;

    public CountingOutputStream(final OutputStream out,
                                final ProgressListener listener) {
        super(out);
        this.listener = listener;
        this.transferred = 0;
    }

    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
        this.transferred += len;
        this.listener.transferred(this.transferred);
    }

    public void write(int b) throws IOException {
        out.write(b);
        this.transferred++;
        this.listener.transferred(this.transferred);
    }
    }
    }

    Call the Async task like this
    new UploadFileToServer().execute();


    The Call method:
    private class UploadFileToServer extends AsyncTask {
    @Override
    protected void onPreExecute() {

        super.onPreExecute();
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {

    }

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

        return uploadFile();

    }

    private String uploadFile() {

        String responseString = null;

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(Config.Seeker_Image_Upload);

        try {
            AndroidMultiPartEntity entity = new AndroidMultiPartEntity(new AndroidMultiPartEntity.ProgressListener() {

                @Override
                public void transferred(long num) {
                    publishProgress((int) ((num / (float) totalSize) * 100));
                }
            });

            File sourceFile = new File(Path);

            // Adding file data to http body
            entity.addPart("logo", new FileBody(sourceFile));

            // Extra parameters if you want to pass to server
            //entity.addPart("website", new StringBody("www.androidhive.info"));

            // String emailaddress = UserActivity.emailaddress;

            /*preferences = SeekerProfile.this.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
            email_address = preferences.getString("EMAILADDRESS", "");*/
            entity.addPart("EMAILADDRESS", new StringBody(email_address));
            entity.addPart("OPER", new StringBody(Operation_recruiter_logo_upload));

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

            // Making server call
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity r_entity = response.getEntity();

            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                // Server response
                responseString = EntityUtils.toString(r_entity);
            } else {
                responseString = "Error occurred! Http Status Code: " + statusCode;
            }

        } catch (ClientProtocolException e) {
            responseString = e.toString();
        } catch (IOException e) {
            responseString = e.toString();
        }

        return responseString;

        }

        @Override
        protected void onPostExecute(String result) {
        //Log.e(TAG, "Response from server: " + result);
        enter code here
        }

    }