Base de volley

gistfile1.txt

        // dialog para dar um feedback ao usuario
        progressDialog.setMessage(getResources().getString(R.string.loadingRegistros));
        progressDialog.show();

        // string request
        StringRequest stringRequest = new StringRequest(Request.Method.POST, JSON_URL,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {

                        // tirar o dialog
                        progressDialog.dismiss();

                   
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {

                        //tirar o dialog
                        progressDialog.dismiss();
                    }
                }) {
            @Override
            protected Map<String, String> getParams() {

                // Creating Map String Params.
                Map<String, String> params = new HashMap<String, String>();

                // Adding All values to Params.
                params.put(/*"name do php"*/, /*Valor*/);

                return params;
            }

        };

        requestQueue.getCache().clear();
        requestQueue.add(stringRequest);
    }