send file using volley android

This is what I used to upload a PDF, but you can use it to any file. I used the same VolleyMultipartRequest, you just have to get the data from the file to upload it. Hope it helps you!

private void uploadPDF() {
    VolleyMultipartRequest volleyMultipartRequest = new VolleyMultipartRequest(
            Request.Method.POST,
            url,
            new Response.Listener<NetworkResponse>() {
                @Override
                public void onResponse(NetworkResponse response) {
                    //Handle response
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    //Handle error
                }
            }
    ) {
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String, String> params = new HashMap<>();
            //Params
            return params;
        }

        @Override
        protected Map<String, DataPart> getByteData() {
            Map<String, DataPart> params = new HashMap<>();
            String pdfName = String.valueOf(System.currentTimeMillis() + ".pdf");
            params.put("pdf", new DataPart(pdfName, getFileData()));
            return params;
        }
    };

    //I used this because it was sending the file twice to the server
    volleyMultipartRequest.setRetryPolicy(
            new DefaultRetryPolicy(
                    0,
                    -1,
                    DefaultRetryPolicy.DEFAULT_BACKOFF_MULT
            )
    );

    requestQueue.add(volleyMultipartRequest);
}

private byte[] getFileData() {
    int size = (int) pdf.length();
    byte[] bytes = new byte[size];
    byte[] tmpBuff = new byte[size];

    try (FileInputStream inputStream = new FileInputStream(pdf)) {
        int read = inputStream.read(bytes, 0, size);
        if (read < size) {
            int remain = size - read;
            while (remain > 0) {
                read = inputStream.read(tmpBuff, 0, remain);
                System.arraycopy(tmpBuff, 0, bytes, size - remain, read);
                remain -= read;
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    return bytes;
}