发出HTTP请求以填充AutoCompleteTextView

Question

我有一个AutoCompleteTextView，我希望通过在线API填充数据。我一直在关注这个指南

http://makovkastar.github.io/blog/2014/04/12/android-autocompletetextview-with-suggestions-from-a-web-service/

哪个工作得很好，但我现在正在尝试编辑getFilter方法来发出HTTP请求，获取数据并对其进行处理。我已经使用Fuel https://github.com/kittinunf/Fuel了。

目前我编写的代码是：

public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    List<Location> books = findLocation(mContext, constraint.toString());

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

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

    /**
     * Returns a search result for the given book title.
     */
    private List<Location> findLocation(Context context, String bookTitle) {
        List<Pair<String, String>> params = new ArrayList<>();
        params.add(new Pair<>("searchterm", bookTitle));

        Fuel.post("https://...search.php", params).responseString(new Handler<String>() {
            @Override
            public void failure(@NotNull Request request, @NotNull Response response, @NotNull FuelError error) {

            }

            @Override
            public void success(@NotNull Request request, @NotNull Response response, String data) {

                List<Location> downloaded = new ArrayList<Location>();
                try {

                    JSONObject obj = new JSONObject(data);

                    if (obj.has("success")){
                        JSONArray success = obj.getJSONArray("success");

                        for(int i = 0 ; i < success.length(); i++) {
                            Location newlocation = new Location();
                            newlocation.setLocationID(success.getJSONObject(i).getString("TermID"));
                            newlocation.setLocationName(success.getJSONObject(i).getString("UniqueTerm"));
                            downloaded.add(newlocation);
                        }
                    }

                } catch (Throwable t) {

                }


            }
            });

        return null;
    }

当然，问题在于HTTP请求是异步完成的，因此构建的Locations数组不会被分配给AutoCompleteTextView。

一旦请求成功，我不确定修改代码以更新AutoCompleteTextView的最佳方法。