How to upload a bitmap image to server using android volley library?

As far as I know, Volley isn't the right choice to send a large amount of data (like an image) to a remote server. Anyway, if you want to send an image you should extend Request class and implements your logic. You could take as an example some classes already available in the toolbox package. Otherwise, You can use HttpURLConnection and implement your logic, first you have to set:

con.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

where boundary is a string you like. Then you have to get the output stream from connection and start writing your parts.

public void addFilePart(String paramName, String fileName, byte[] data) throws Exception {
  os.write( (delimiter + boundary + "\r\n").getBytes());
  os.write( ("Content-Disposition: form-data; name=\"" + paramName +  "\";    filename=\"" + fileName + "\"\r\n"  ).getBytes());
  os.write( ("Content-Type: application/octet-stream\r\n"  ).getBytes());
  os.write( ("Content-Transfer-Encoding: binary\r\n"  ).getBytes());
  os.write("\r\n".getBytes());

  os.write(data);

  os.write("\r\n".getBytes());
}

And so on. I wrote a tutorial about it (since you are asking a link). You can give a look here.

If you don't like HttpUrlConnection you can use more easily Apache Http client.

HttpClient client = new DefaultHttpClient(); 
HttpPost post = new HttpPost(url); 

and then:

MultipartEntity multiPart = new MultipartEntity();
multiPart.addPart("param1", new StringBody(param1)); 
multiPart.addPart("param2", new StringBody(param2)); 
multiPart.addPart("file", new ByteArrayBody(baos.toByteArray(), "logo.png")); // Your image

Hope it helps you!