How to control automagically appearing indeterminate progress circle

Question

In MainActivity.onStart() of my app, it gets data from a RESTful service, populates a local SQLite db with data from the service, then populates a View with that data. Using RxJava, the functionality that calls the RESTful service and populates the SQLite is made to be the observable and the fragment containing the View uses RxJava to subscribe to this. When it is done, the View is notified and gets the data from the SQLite db. During this process, a progress circle appears (automatically, I've added no progress bar code myself). When the View has been populated, the circle is no longer displayed. All is well.

When the device is turned from Portrait -> Landscape (or vice-versa), my code recognizes this and skips the RESTful service and, using a similar observer/subscriber mechanism, gets data from the SQLite db and populates the View. The progress circle is displayed again here but, this is the problem, it keeps spinning and never goes away, though the app continues to function normally.

What is causing this progress circle to appear? How can I control it?

First observer/subscriber:

MyListFragment myListFragment = (MyListFragment) getSupportFragmentManager().findFragmentByTag(getResources().getString(R.string.fragment_main_tag));
mLoadAndStoreDataObservable = Observable.create(
   new Observable.OnSubscribe<String>() {
         @Override
         public void call(Subscriber<? super String> subscriber) {

             try {
                 Utilities.loadAndStoreData(mActivity); // call RESTful service, populate SQLite
                 subscriber.onNext("Utilities.loadAndStoreData Done");
             }
             catch (Exception e) {
             subscriber.onError(e);
             }
         }
       }
     )
     .subscribeOn(Schedulers.io())
     .observeOn(AndroidSchedulers.mainThread())
     .subscribe(myListFragment);

Observer/subscriber when device is rotated:

MyListFragment myListFragment = (MyListFragment) getSupportFragmentManager().findFragmentByTag(getResources().getString(R.string.fragment_main_tag));
mLoadAndStoreDataObservable = Observable.create(
   new Observable.OnSubscribe<String>() {
         @Override
         public void call(Subscriber<? super String> subscriber) {

             try {
                // don't call restful service,  Just tell observer that data is available in SQLite
                subscriber.onNext("Utilities.loadAndStoreData Done");
             }
             catch (Exception e) {
             subscriber.onError(e);
             }
         }
       }
     )
     .subscribeOn(Schedulers.io())
     .observeOn(AndroidSchedulers.mainThread())
     .subscribe(myListFragment);

MyListFragment

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view =  super.onCreateView(inflater, container, savedInstanceState);

    setListAdapter(null); // see if this prevents progress circle ... nope
    return view;
}

@Override
public void onNext(String s) {
    // SQLite is populated now, so display the data in the list view
    ArrayList<MyListData> myListDataList = Utilities.getDataFromSQLite(getActivity());
    MyListAdapter adapter = new MyListAdapter(getActivity(), android.R.layout.simple_list_item_1, myListDataList);
    setListAdapter(adapter);
}

The device I am testing with is a (1st gen) Nexus 7, Android 4.2.2 and a (2nd gen) Nexus 7, Android 4.4.4

Answer:
LordRaydenMK suggests that the default ListView implementation shows a spinner when the list doesn't have an adapter set This indeed appears to be the case. Setting the adapter like below causes the progress circle not to appear

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view =  super.onCreateView(inflater, container, savedInstanceState);

    String[] values = new String[] { "Waiting for data ..." }; // never see this but whatever
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity() .getApplicationContext(), android.R.layout.simple_list_item_1,  android.R.id.text1, values);
    setListAdapter(adapter); // see if this prevents progress circle ... yep
    return view;
}

Answer 1

I can't be of much help without the code from MyListFragment. However I can (try) to point you in the right direction.

The default ListView implementation shows a spinner when the list doesn't have an adapter set. Are you sure you are setting the adapter? Are you using setListAdapter to set the adapter?

Also I would like to recommend a different approach when using RxJava with multiple data sources. Check out this blog post by Dan Lew. It uses the concat() and first() operators to find the best source for your data.

// Our sources (left as an exercise for the reader)
Observable<Data> memory = ...;  
Observable<Data> disk = ...;  
Observable<Data> network = ...;

// Retrieve the first source with data
Observable<Data> source = Observable  
  .concat(memory, disk, network)
  .first();