How to implement Web services consumption POST using "x-www-form-urlencode"

VolleyExamplePOST.java

RequestQueue requestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(
                        Request.Method.POST,
                        "github.com/api/login",
                        new Response.Listener<JSONObject>() {
                            @Override
                            public void onResponse(JSONObject response) {
                                Log.e("LOGIN", response.toString());
                            }
                        },
                        new Response.ErrorListener() {
                            @Override
                            public void onErrorResponse(VolleyError error) {
                                Log.e("LOGIN ERROR", error.toString());
                            }
                        })
                {
                    @Override
                    public byte[] getBody() {
                        try
                        {
                            final String body = "&email=" + "test@test.com" +
                                    "&password=" + "test";
                            return body.getBytes("utf-8");
                        }
                        catch (Exception ex) {
                            Log.e("getBodyEx", ex.toString());
                        }

                        return null;
                    }

                    @Override
                    public String getBodyContentType() {
                        return "application/x-www-form-urlencoded";
                    }

                    @Override
                    public Map<String, String> getHeaders() throws AuthFailureError {
                        Map<String, String> headers = new HashMap<String, String>();

                        headers.put("Accept", "application/json");

                        return headers;
                    }
                };
                requestQueue.add(jsonObjectRequest);