Develop Reference

Nested Volley Requests in Android Studio in single session connection

I want to extract data from an HTTPS site. but It's generating an access code for every new opening of the website. so I used volley for getting access code once and getting the result of https once but when I am making 2nd request to get the result, a new session is a creation that leads to a change of access code. Can I do this in a single request ? or is there any alternate way to do this?
RequestQueue queue = Volley.newRequestQueue(this);
String url ="https://jntukresults.edu.in/view-results-56736070.html";
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
access_code=StringUtils.substringBetween(response, "&accessToken=\"+", ",true);");
Toast.makeText(getApplicationContext(),raju,Toast.LENGTH_LONG).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_SHORT).show();
}
});
Volley.newRequestQueue(getApplicationContext()).add(stringRequest);
String resultUrl="https://jntukresults.edu.in/results/res.php?ht=16FE1A0593&id=56736070&accessToken="+access_code;
StringRequest stringRequest1=new StringRequest(Request.Method.GET, resultUrl, new Response.Listener<String>() {
#Override
public void onResponse(String response2) {
textView.setText(response2);
Toast.makeText(getApplicationContext(),response2,Toast.LENGTH_SHORT).show();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
Volley.newRequestQueue(getApplicationContext()).add(stringRequest1);

How to get first value of array using Volley in android

How to get first value of array using Volley in android? this method is successfully for me to get all value from array, but i just want to get first value only.
private void getValue(PriceModel priceModel, final ViewHolderPrice holder) {
StringRequest request = new StringRequest(
Request.Method.GET,
ServerApi.URL + priceModel.get_id(),
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
if(!response.isEmpty()) {
Gson gson = new Gson();
PriceModel[] priceModels = gson.fromJson(response, PriceModel[].class); for(PriceModel price: priceModels) holder.tvPrice.setText(variantModels.getPrice());
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d(TAG, error.getLocalizedMessage());
}
}
);
Volley.newRequestQueue(mContext).add(request);
}

Android - Volley : Response is too late

So I've run into a problem in my code, where I need to get a JSONString from my server with volley. And then I have to parse the String into a JSONObject and then continue doing stuff with that.
My problem here is, that Volley gives the response too late, meaning my string that I want to parse is always empty because its not initialised yet.
RequestFuture<String> future = RequestFuture.newFuture();
StringRequest stringRequest = new StringRequest(Request.Method.GET, searchURLBuilder, future, future);
// new Response.Listener<String>() {
// #Override
// public void onResponse(String response) {
// writeToSharedResponse(response_for_search, response);
// }
// },
// new Response.ErrorListener() {
// #Override
// public void onErrorResponse(VolleyError error) {
// Log.d("Error!!:" + error.getMessage(), "");
// }
// });
requestQueue.add(stringRequest);
String response = "";
try {
response = future.get(60, TimeUnit.SECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
} catch (TimeoutException e) {
e.printStackTrace();
}
String responseString = m.getString(response_for_search, new String());
pieceDTOList = getPiecesDTOFromJSON(responseString);
Here is a snippet of my code. As you can see I already tried to make a "future" call to block and wait for the answer, but it just times out every time. The commented out bit, is the part I actually wanted to use from the beginning, but that returns the response to late. Since its asynchronous and accesses the server w/e it wants.
writeToSharedResponse just writes the answer into a sharedPreferences variable.
private SharedPreferences m;
private SharedPreferences.Editor editor;
private RequestQueue requestQueue;
public DbParser(Context c) {
m = PreferenceManager.getDefaultSharedPreferences(c);
editor = m.edit();
requestQueue = Volley.newRequestQueue(c);
}
My Question here is: Is there an easy way I can "wait" for the answer from volley so I can continue to work with the response that I get?
Edit 1:
I now added an interface and changed the code around to this:
getString(new VolleyCallback() {
#Override
public void onSuccess(String result) {
getPiecesDTOFromJSON(result);
}
}, searchURLBuilder);
return globalPieceDTOList;
}
private void getString(final VolleyCallback callback, String searchUrl){
StringRequest stringRequest = new StringRequest(Request.Method.GET, searchUrl,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
callback.onSuccess(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("Error!!:" + error.getMessage(), "");
}
});
requestQueue.add(stringRequest);
}
Since I cant get the values out of my inner classes, I did a nasty hack and created a global list for my DTO's. The problem now is that "return globalPieceDTOList" is always Null. And again - I would need to "wait" for the Volley response.

Volley requests are async, so when you try to return a value, the request is likely not done yet. If you want to return values from a Volley request use callback interfaces.
Example
public void getString(final VolleyCallback callback) {
StringRequest strReq = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
// do some things here
callback.onSuccess(<PASS STRING RESULT HERE>);
}
});
}
public interface VolleyCallback{
void onSuccess(String result);
}
Example usage:
public void onResume(){
super.onResume();
getString(new VolleyCallback(){
#Override
public void onSuccess(String result){
//do stuff here with the result from the volley request
}
});
}

Android: how to do a simple POST request with Volley, without expected result?

I want to send a POST request to my server, and there is no expected data for the result (just HTTP status code - standard behavior). How can I do that ?
(abstract base Request class (Volley) wants a result type)
try {
mRequest =
new XXXXXX(
Request.Method.POST,
url,
null, null,
new Response.Listener() {
#Override
public void onResponse() {
// ok
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError e) {
// ko
}
},
null
);
return mRestCoreVolley.addToRequestQueue(mRequest);
} catch (Exception e) {
// error
}

You could try something like in the code below for the response listener:
new Response.Listener<Void>() {
#Override
public void onResponse(Void response) {
}
}

I guess your code is right. You can use a String like:
RequestQueue rq = Volley.newRequestQueue(this);
StringRequest postReq = new StringRequest(Request.Method.POST,
your_url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
// do nothing
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// Handle error
}
}) ;
Hope it helps you!

Volley pass a response outside of the class

I want to pass a response outside of my classes (many classes)
public static void userLocation()
{
RequestQueue queue = Volley.newRequestQueue(context);
String url = "http://www.jobdiagnosis.com/iphone/userlocation.php";
StringRequest dr = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>()
{
#Override
public void onResponse(String response) {
// response
//Toast.makeText(context, ""+response, Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError error) {
// error.
// Toast.makeText(getApplicationContext(), "error"+error, Toast.LENGTH_LONG).show();
Log.d("error", ""+error);
}
}
);
queue.add(dr);
}
Please suggest how I can pass a response outside of the class

In volly its difficult to return response outside the class.because request on server run in background and if we return value followed by queue.add(url) then it will return null.So there is no solution till now.Thanks!!