로그인 소스 질문입니다.

Question

//로그인정보가 mysql db와 맞는지 증명하는 함수

private void checkLogin(final String phonenumber, final String password){
    //요청을 취소하는데 사용되는 tag
    String tag_string_req = "req_login";

    pDialog.setMessage("로그인 하는중...");
    showDialog();

    StringRequest strReq = new StringRequest(Method.POST, AppConfig.URL_REGISTER, new Response.Listener<String>(){
        @Override
        public void onResponse(String response){
           
            Log.d(TAG, "login_response: " + response.toString());
            hideDialog();

            try{
                JSONObject jObj = new JSONObject(response);
                JSONObject user = jObj.getJSONObject("user");
                boolean error = jObj.getBoolean("error");

                //check for error node in json
                if(!error){
                    //user successfully logged in
                    //create login session
                    session.setLogin(true);

                    //launch main activity
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                }
                else{
                    //error in login. get the error message
                    String errorMsg = jObj.getString("error");
                    Toast.makeText(getApplicationContext(), errorMsg, Toast.LENGTH_LONG).show();
                }
            }catch (JSONException e){
                //JSON error
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener(){

        @Override
        public void onErrorResponse(VolleyError error){
            Log.e(TAG, "login_error: "+error.getMessage());
            Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
            hideDialog();
        }
    }) {
        @Override
        protected Map<String, String> getParams(){
            //posting parameters to login url
            Map<String, String> params = new HashMap<String, String>();
            params.put("tag", "login");
            params.put("phonenumber", phonenumber);
            params.put("password", password);

            return params;
        }
    };

    //adding request to request queue
    AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}

private void showDialog(){
    if(!pDialog.isShowing())
        pDialog.show();
}

private void hideDialog(){
    if(pDialog.isShowing())
        pDialog.dismiss();
}

StringRequest 부분부터 아예 수행이 되지 않고 있네요..ㅠㅠ왜이럴까요