android studio RequestQueue post

String url = "http://bobo.sulink.cn/api/User/Sign2";

    RequestQueue queue = Volley.newRequestQueue(this);

    StringRequest stringRequest = new StringRequest(
            Request.Method.POST,
            url,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    Log.e("BOBO", response);
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.e("BOBO","失败");
                }
            }
    ){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            //创建一个集合，放的是keyvalue的key是参数名与value是参数值
            Map<String, String> map = new HashMap<String, String>();
            map.put("userid", "100045");
            Log.e("bobo", map.toString());
            return map;
        }
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String,String> headers=new HashMap<String,String>();
            headers.put("Content-Type", "application/json");
            Log.e("bobo", headers.toString());
            return headers;
        }
    };
    queue.add(stringRequest);

把这里去掉