Android Offline Request with Volley

Question

I want to give to my user a much better offline user experience, therefore, I want to build a Service which stores all POST, DELETE,

Answer 1

you maybe do a networking validation method :
1. check the network connection
YES:
a) make the volley request
b) parse the adapter from volley request
c) and save the json into a private file

NO:
a) read the private file
b) make the adapter from json file downloaded.

********************** for example

    if(isconnect){   
    JsonArrayRequest Req = new JsonArrayRequest(url,
            new Response.Listener() {
                public void onResponse(JSONArray response) {
                  //this the request of your http request 
                   Log.d(TAG, response.toString());
                     // Parsing json
                      for (int i = 0; i < response.length(); i++) {
                        try {
                         ......adapter etc etc
                         }
                        adapter.notifyDataSetChanged();
                        //here write the httprequest (json file) in local memory 
                          try {
                          String textjson= response.toString();
                          fos = context.openFileOutput("request.json",MODE_PRIVATE);
                          fos.write(textjson.getBytes("ISO-8859-1")); //encode
                          fos.close();
                          } catch (IOException e) {
                             // TODO Auto-generated catch block
                             e.printStackTrace();
                          }
                    swipeRefreshLayout.setRefreshing(false);  
                 }  
              }, new Response.ErrorListener() {
               @Override
               public void onErrorResponse(VolleyError error) {
               // VolleyLog.d(TAG, "Error: " + error.getMessage());
             }   });      AppController.getInstance().addToRequestQueue(movieReq);
                            }
                        else{
                            //noconnection();
                            in the noconnection method u can parse the               listview/recyclerview from json file to make the offline mode } 
}else{
    //parse the listview/recyclerview from local file. }