Android Volley - Checking internet state

Question

Before I am using Volley, well as usual, I used AsyncTask to check my internet state.

Here is what I did in AsyncTask:

private class NetCheck extends AsyncTask<String, Void, Boolean> {      @Override     protected Boolean doInBackground(String... args) {         // get Internet status         return cd.isConnectingToInternet();     }      protected void onPostExecute(Boolean th) {         if (th == true) {             new LoadCategories().execute();         } else {             Toast.makeText(CategoryActivity.this, "Unable to connect to server",                     Toast.LENGTH_LONG).show();         }     } } 

And this is isConnectingToInternet function:

public boolean isConnectingToInternet() {     ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);     if (connectivity != null) {         NetworkInfo info = connectivity.getActiveNetworkInfo();         if (info != null && info.isConnected())                 try {                 URL url = new URL("http://www.google.com");                 HttpURLConnection urlc = (HttpURLConnection) url                         .openConnection();                 urlc.setConnectTimeout(3000);                 urlc.connect();                 if (urlc.getResponseCode() == 200) {                     return true;                 }             } catch (MalformedURLException e1) {                 e1.printStackTrace();             } catch (IOException e) {                 e.printStackTrace();             }      }     return false; } 

How do I achieve this using Volley?

Answer 1

There is NoConnection Error that get thrown for the Request. Please catch the error in

   @Override    public void onErrorResponse(VolleyError volleyError) {    String message = null;    if (volleyError instanceof NetworkError) {          message = "Cannot connect to Internet...Please check your connection!";    } else if (volleyError instanceof ServerError) {          message = "The server could not be found. Please try again after some time!!";    } else if (volleyError instanceof AuthFailureError) {          message = "Cannot connect to Internet...Please check your connection!";    } else if (volleyError instanceof ParseError) {          message = "Parsing error! Please try again after some time!!";    } else if (volleyError instanceof NoConnectionError) {          message = "Cannot connect to Internet...Please check your connection!";    } else if (volleyError instanceof TimeoutError) {          message = "Connection TimeOut! Please check your internet connection.";    } } 

Answer 2

This is how I make Volley Request and handle response and errors, you don't need to add Async task for this, volley make request in backend

StringRequest strReq = new StringRequest(Request.Method.POST, "your_url", new Response.Listener<String>() {             @Override             public void onResponse(String response) {                  // handle your response here                 // if your response is a json then create json object and use it                 try {                     JSONObject jsonObject = new JSONObject(response);                      // now you can get values from your jsonObject                  }                 catch (Exception e){}              }         }, new Response.ErrorListener() {             @Override             public void onErrorResponse(VolleyError volleyError) {                  String message = null; // error message, show it in toast or dialog, whatever you want                 if (volleyError instanceof NetworkError || volleyError instanceof AuthFailureError || volleyError instanceof NoConnectionError || volleyError instanceof TimeoutError) {                     message = "Cannot connect to Internet";                 } else if (volleyError instanceof ServerError) {                     message = "The server could not be found. Please try again later";                 }  else if (volleyError instanceof ParseError) {                     message = "Parsing error! Please try again later";                 }              }         }) {             @Override             public byte[] getBody() throws AuthFailureError {                  HashMap<String, String> params = new HashMap<>();                 params.put("key","value"); // put your params here                  return new JSONObject(params).toString().getBytes();             }              @Override             public String getBodyContentType() {                 return "application/json";             }         };         // Adding String request to request queue          Volley.newRequestQueue(getApplicationContext()).add(strReq);