Check if Volley gets results from cache or over network

Question

How can I check whether Volley gets the results of a JsonObjectRequest from the cache or from the network?

I need to show a progress dialog when it needs a network connection but not when the results are quickly received from the cache.

my request looks something like this

volleyQueue = Volley.newRequestQueue(this);
JsonObjectRequest jr = new JsonObjectRequest(Request.Method.POST, url, null, new Response.Listener<JSONObject>(){...stuff}, new Response.ErrorListener(){...errorstuff});
jr.setShouldCache(true);
volleyQueue.add(jr);

Answer 1

I did this by overriding Request#addMarker and checking for a "cache-hit" marker being added:

public class MyRequest<T> extends Request<T> {

    protected boolean cacheHit;

    @Override
    public void addMarker(String tag) {
        super.addMarker(tag);
        cacheHit = false;
        if (tag.equals("cache-hit")){
            cacheHit = true;
        }
    }
}

Answer 2

Before making the Request you can get the cache from the Request Queue and check if the Entry is not null.

mRequestQueue.getCache().get("key");

The key for each request is usually the URL. I guess you should have to check if the Entry has expired too.