Handle Volley error

Question

I want to handle and show some message in onErrorResponse

below is my code.

String url = MainActivity.strHostUrl+"api/delete_picture";  jobjDeleteImage = new JsonObjectRequest(Request.Method.POST, url, jobj, new Response.Listener<JSONObject>() {      @Override     public void onResponse(JSONObject response) {         Log.e("Image response", response.toString());       } },  new Response.ErrorListener() {      @Override     public void onErrorResponse(VolleyError error) {          Log.e("Volly Error", error.toString());          NetworkResponse networkResponse = error.networkResponse;         if (networkResponse != null) {             Log.e("Status code", String.valueOf(networkResponse.statusCode));         }     } }); 

I want to handle com.android.volley.TimeoutError and also some other error code like 404, 503 etc and Toast message here.

Answer 1

The networkResponse is null because in a TimeoutError no data is received from the server -- hence the timeout. Instead, you need generic client side strings to display when one of these events occur. You can check for the VolleyError's type using instanceof to differentiate between error types since you have no network response to work with -- for example:

@Override public void onErrorResponse(VolleyError error) {      if (error instanceof TimeoutError || error instanceof NoConnectionError) {         Toast.makeText(context,                 context.getString(R.string.error_network_timeout),                 Toast.LENGTH_LONG).show();     } else if (error instanceof AuthFailureError) {         //TODO     } else if (error instanceof ServerError) {        //TODO     } else if (error instanceof NetworkError) {       //TODO     } else if (error instanceof ParseError) {        //TODO     } } 

Answer 2

This is what I am using in my projects.

        @Override         public void onErrorResponse(VolleyError error) {             if(error instanceof NoConnectionError){                 ConnectivityManager cm = (ConnectivityManager)mContext                         .getSystemService(Context.CONNECTIVITY_SERVICE);                 NetworkInfo activeNetwork = null;                 if (cm != null) {                     activeNetwork = cm.getActiveNetworkInfo();                 }                 if(activeNetwork != null && activeNetwork.isConnectedOrConnecting()){                     Toast.makeText(getActivity(), "Server is not connected to internet.",                             Toast.LENGTH_SHORT).show();                 } else {                     Toast.makeText(getActivity(), "Your device is not connected to internet.",                             Toast.LENGTH_SHORT).show();                 }             } else if (error instanceof NetworkError || error.getCause() instanceof ConnectException                      || (error.getCause().getMessage() != null                      && error.getCause().getMessage().contains("connection"))){                 Toast.makeText(getActivity(), "Your device is not connected to internet.",                          Toast.LENGTH_SHORT).show();             } else if (error.getCause() instanceof MalformedURLException){                 Toast.makeText(getActivity(), "Bad Request.", Toast.LENGTH_SHORT).show();             } else if (error instanceof ParseError || error.getCause() instanceof IllegalStateException                     || error.getCause() instanceof JSONException                     || error.getCause() instanceof XmlPullParserException){                 Toast.makeText(getActivity(), "Parse Error (because of invalid json or xml).",                          Toast.LENGTH_SHORT).show();             } else if (error.getCause() instanceof OutOfMemoryError){                 Toast.makeText(getActivity(), "Out Of Memory Error.", Toast.LENGTH_SHORT).show();             }else if (error instanceof AuthFailureError){                 Toast.makeText(getActivity(), "server couldn't find the authenticated request.",                          Toast.LENGTH_SHORT).show();             } else if (error instanceof ServerError || error.getCause() instanceof ServerError) {                 Toast.makeText(getActivity(), "Server is not responding.", Toast.LENGTH_SHORT).show();             }else if (error instanceof TimeoutError || error.getCause() instanceof SocketTimeoutException                     || error.getCause() instanceof ConnectTimeoutException                      || error.getCause() instanceof SocketException                     || (error.getCause().getMessage() != null                      && error.getCause().getMessage().contains("Connection timed out"))) {                 Toast.makeText(getActivity(), "Connection timeout error",                          Toast.LENGTH_SHORT).show();             } else {                 Toast.makeText(getActivity(), "An unknown error occurred.",                          Toast.LENGTH_SHORT).show();             }         }