Fetch Free Agents

    /**
     * An asynchronous task used fetch the current league's free agents.
     * Returns a FantasyLeague object.
     */
    public class GetFreeAgentsTask extends AsyncTask<Void, Void, FantasyLeague> {

        private List<Exception> exceptions = new ArrayList<Exception>();

        @Override
        protected FantasyLeague doInBackground(Void... params) {
            try {
                return mLeague.refreshFreeAgents(InDraftActivity.this.getApplicationContext());
            } catch (JSONException e) {
                exceptions.add(e);
                return null;
            } catch (ServerErrorException e) {
                exceptions.add(e);
                return null;
            }
        }

        @Override
        protected void onPostExecute(FantasyLeague league) {
            super.onPostExecute(league);

            // If there are any exceptions, display them via toast.
            for (Exception e : exceptions) {
                if (getApplicationContext() != null) {
                    ErrorHelper.showErrorToast(getApplicationContext(), e.getMessage());
                }
            }

            // Handle a failed request with no exceptions.
            if (league == null && exceptions.isEmpty()) {
                if (getApplicationContext() != null) {
                    ErrorHelper.showErrorToast(getApplicationContext(), "Failed to retrieve free agents.");
                }
            }

            // Handle the normal result.
            onGetFreeAgentsResult(league);
        }
    }