Google Places自动完成API-线程

Question

I have implemented autocomplete of Google Places using the API following this tutorial pretty strictly - https://developers.google.com/places/training/autocomplete-android . My question is, why is this working when no multi-threading work has been done - no asynchTasks or anything. Shouldn't the app be crashing, as there is an http request from the main thread? Here'e the line that I would think the app would crash at -

conn = (HttpURLConnection) url.openConnection();

Answer 1

The network call is performed inside the Filter.performFiltering method:

@Override
public Filter getFilter() {
    Filter filter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults filterResults = new FilterResults();
            if (constraint != null) {
                // Retrieve the autocomplete results.
                resultList = autocomplete(constraint.toString());

                // Assign the data to the FilterResults
                filterResults.values = resultList;
                filterResults.count = resultList.size();
            }
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (results != null && results.count > 0) {
                notifyDataSetChanged();
            }
            else {
                notifyDataSetInvalidated();
            }
        }};
    return filter;
}

As you can see from the documentation, the Filter.performFiltering() method is executed inside a worker thread:

Invoked in a worker thread to filter the data according to the constraint. Subclasses must implement this method to perform the filtering operation. Results computed by the filtering operation must be returned as a Filter.FilterResults that will then be published in the UI thread through publishResults(CharSequence, android.widget.Filter.FilterResults) .