android - Accessing asynchronous activity state in Espresso -

i want know how many list items used in recyclerview can iterate on list items , click on them espresso. problem i'm using volley asynchronously json data need underlying data set of adapter. i've used idling resource counter in ui test defer execution of test until counter zero. however, calling getitemcount on adapter still results in zero, despite fact networking operation should resolve before test executes.

ui test code

@test public void foo(){    // register idling resource counter volley json data asynchronously   espresso.registeridlingresources(mactivitytestrule.getactivity().idlingcounter);    recyclerview v           = (recyclerview)           mactivitytestrule.getactivity().findviewbyid(r.id.rv_recycler_view);     int count = v.getadapter().getitemcount();    // prints zero; why?   system.out.println("adapter count = "+string.valueof(count)); }  

here oncreate method. adapter list initialized empty, populated in onreponse when volley finishes networking. however, espresso doesn't seem wait onreponse called. not sure why, believe i'm using idling resource counter correctly.

recyclerview mrecyclerview; public adapter madapter;  public countingidlingresource idlingcounter = new countingidlingresource("data_loader");  @override public void oncreate(bundle savedinstacestate){      // ... code      // init empty array list     arraylist<myobject> list = new arraylist<>();      // init adapter list, , set adapter view     mrecycleradapter = new adapter(list, mainactivity.this);     mrecyclerview.setadapter(mrecycleradapter);     mrecyclerview.setlayoutmanager(new linearlayoutmanager(mainactivity.this));      // add json data list; increment idlingcounter resource counter.     // decrement idlingcounter in onresponse     idlingcounter.increment();     fetchjson(); } 

edit

mainactivity class

public class mainactivity extends appcompatactivity {      // debugging     private static final string tag = mainactivity.class.getsimplename();      // testing     public countingidlingresource idlingcounter = new countingidlingresource("data_loader");      // networking     private requestqueue requestqueue;      // data     private arraylist<recipe> mrecipes = new arraylist<>();      // ui     public adapter mrecycleradapter;     @bindview(r.id.rv_recycler_view) recyclerview mrecyclerview;      @override     protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          butterknife.bind(this);          getsupportactionbar().settitle("recipes");          // perform networking if there no saved instance state         if(null == savedinstancestate){              requestqueue = volley.newrequestqueue(this);             // todo calling idlingcounter.increment()             idlingcounter.increment();             fetch(requestqueue); // initializes recycler view adapter when done fetching          } else {             log.v(tag,"null != savedinstancestate");             mrecipes = savedinstancestate.getparcelablearraylist(constants.key_recipes);             mrecycleradapter = new adapter(mrecipes, this);             mrecyclerview.setadapter(mrecycleradapter);             mrecyclerview.setlayoutmanager(new linearlayoutmanager(this));         }     }      @override     public void onsaveinstancestate(bundle outstate) {         outstate.putparcelablearraylist(constants.key_recipes,mrecipes);         super.onsaveinstancestate(outstate);     }      // fetch json , build recipe-object array-list     private void fetch(requestqueue requestqueue) {          // define request         jsonarrayrequest request = new jsonarrayrequest(constants.jsonurl,                 new response.listener<jsonarray>() {                      // handles json response data                     @override                     public void onresponse(jsonarray jsonarray) {                          log.v(tag,"onresponse");                          (int = 0; < jsonarray.length(); i++) {                             try {                                 jsonobject jsonobject = jsonarray.getjsonobject(i);                                 recipe recipe = new recipe(jsonobject);                                 //recipe.msteps.remove(0);                                 mrecipes.add(recipe);                                 log.v(tag,jsonobject.tostring());                              } catch (jsonexception e) {                                 e.printstacktrace();                             }                         }                          // initialize adapter when json data ready                         // todo initializing adapter withe data set                         mrecycleradapter = new adapter(mrecipes, mainactivity.this);                         mrecyclerview.setadapter(mrecycleradapter);                         mrecyclerview.setlayoutmanager(new linearlayoutmanager(mainactivity.this));                          // test if activity opened widget using intent                         intent intent = getintent();                          if(intent.getextras() != null){                              // start twopaneactivity passing intent                             int position = intent.getintextra(widgetprovider.intent_key_recipe_idx,-1);                             intent = new intent(mainactivity.this,twopaneactivity.class);                             recipe recipe = mrecipes.get(position);                             intent.putextra(constants.key_single_recipe,recipe);                             startactivity(intent);                         }                          // todo calling idlingcounter.decrement()                         idlingcounter.decrement();                     }                 },                  // error listener object                 new response.errorlistener() {                     @override                     public void onerrorresponse(volleyerror volleyerror) {                         toast.maketext(mainactivity.this, "unable fetch data: "                                 + volleyerror.getmessage(), toast.length_short).show();                     }                 });          // queue request         requestqueue.add(request);     }      public void foo(){      } }