Android - Wait for volley response to return

Question

I need execute a Volley request and wait for the response to parse it and return it, but have no idea on how to achieve this. Can someone help?

What I have now is th

Answer 1

You should probably not return the link in your method.

Volley is doing asynchronous tasks, it means that you can't know when the answer will arrive from your webservice, it could be 10sec or 10min.

If you need the string in your function you should probably create a method and call it when you have the result.

Here is an example:

I guess this is what you have

public void getTheLinkAndCallDoSomething(){
    String link = getLink();
    doSomethingWithTheLink(link);
}

This would work if getLink() answers in a synchronous way. Volley is not in this case.

And this is what you can do with Volley:

public void getTheLinkAndCallDoSomething(){
     JsonObjectRequest jsObjRequest = new JsonObjectRequest(Request.Method.GET, 
                               url, null, new Response.Listener() {

                    @Override
                    public void onResponse(JSONObject response) {
                        shortenURL = response.getString("url");
                        doSomethingWithTheLink(shortenURL);
                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // TODO Auto-generated method stub

                    }
                });

    queue.add(jsObjRequest);
}

In this case, you call the WS to get your url. And as soon as the result is known, you call doSomethingWithTheLink()

Whatever, if you really do want to be synchronous you can look at this post : Wait for result of Async Volley request and return it

Also, be aware that waiting for an answer could freeze your app UI and I guess that is not what you want.