I’m sending an http request from Android Java using the Volley library to a c# backend. The backend application responds with a error code and description as intended, as well as a StatusDescription. I can see the response status description through wireshark but do not know how to get the description string on the android side.
final JsonObjectRequest request = new JsonObjectRequest(JsonObjectRequest.Method.POST,
url,json,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
TextView mTextView = (TextView) findViewById(R.id.output);
print("Success");
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
TextView mTextView = (TextView) findViewById(R.id.output);
print("Failure (" + error.networkResponse.statusCode + ")");
//Trying to get the error description/response phrase here
}
}
);
This is the C# code processing the request:
[WebInvoke(Method = “POST”, UriTemplate = “users”, BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)] [OperationContract] void addUser(String username, String firstname, String lastname, String email, String hash) { Console.WriteLine(DateTime.Now + ” Packet receieved”);
//Stores the response object that will be sent back to the android client
OutgoingWebResponseContext response = WebOperationContext.Current.OutgoingResponse;
String description = "User added";
response.StatusCode = System.Net.HttpStatusCode.OK;
//Tries to add the new user
try
{
userTable.Insert(username,firstname,lastname,email,hash);
}
catch (SqlException e)
{
//Default response is a conflict
response.StatusCode = System.Net.HttpStatusCode.Conflict;
description = "Bad Request (" + e.Message + ")";
//Check what the conflict is
if (userTable.GetData().AsEnumerable().Any(row => username == row.Field<String>("username")))
{
description = "Username in use";
}
else if (userTable.GetData().AsEnumerable().Any(row => email == row.Field<String>("email")))
{
description = "Email address in use";
}
else
{
response.StatusCode = System.Net.HttpStatusCode.BadRequest;
}
}
//display and respond with the description
Console.WriteLine(description);
response.StatusDescription = description;
}
I’ve looked through other peoples questions but can’t seem to find the answer I’m looking for. Anyone know how to do this? Many methods I have tried resulted in empty curly braces, indicating JSON with an empty body. I am trying specifically to get the status description.
Answer
Try with this custom method:
public void parseVolleyError(VolleyError error) {
try {
String responseBody = new String(error.networkResponse.data, "utf-8");
JSONObject data = new JSONObject(responseBody);
JSONArray errors = data.getJSONArray("errors");
JSONObject jsonMessage = errors.getJSONObject(0);
String message = jsonMessage.getString("message");
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
} catch (UnsupportedEncodingException errorr) {
}
}
It will show toast with error message from the request. Call this in onErrorResponse method in your volley request:
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
parseVolleyError(error);
}
}