app/src/main/java/org/rssin/android/NavigationDrawerAllFeedsFragment.java


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package org.rssin.android;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.android.volley.VolleyError;

import org.rssin.listener.FallibleListener;
import org.rssin.rssin.Filter;
import org.rssin.rssin.R;
import org.rssin.rssin.SortedFeedItemContainer;
import org.rssin.rssin.UnifiedFilterLoader;

import java.io.IOException;
import java.util.List;

/**
 * @author Jos.
 */

public class NavigationDrawerAllFeedsFragment extends Fragment {
    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static NavigationDrawerAllFeedsFragment newInstance() {
        NavigationDrawerAllFeedsFragment fragment = new NavigationDrawerAllFeedsFragment();
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        final View rootView = inflater.inflate(R.layout.fragment_home_screen, container, false);
        final RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.unified_inbox_feeditems);
        final Context context = mRecyclerView.getContext();
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(context);
        mRecyclerView.setLayoutManager(mLayoutManager);

        try {
            FiltersList filtersList = FiltersList.getInstance(context);

            for(Filter filter : filtersList.getFilters()) {
                filter.ensureFeedSorter(DefaultStorageProvider.getInstance(context));
                filter.ensureFeeds(DefaultStorageProvider.getInstance(context));
            }

            /**
             * @todo Load feeds in separate thread so that the UI is immediately available
             *
             * @todo Now, feed items are only returned after *all* feeds have been loaded. With many
             * filters that may take a while, so it would be preferable to return intermediate
             * results. We could do this for example with {@link org.rssin.listener.RealtimeListener}
             */
            UnifiedFilterLoader loaderAndSorter = new UnifiedFilterLoader(filtersList.getFilters());
            loaderAndSorter.getFilteredFeedItems(new VolleyFetcher(context), new FallibleListener<List<SortedFeedItemContainer>, VolleyError>() {
                @Override
                public void onReceive(List<SortedFeedItemContainer> data) {
                    FeedItemAdapter feedItemAdapter = new FeedItemAdapter(data);
                    mRecyclerView.setAdapter(feedItemAdapter);
                    mRecyclerView.setHasFixedSize(true);
                }

                @Override
                public void onError(VolleyError error) {
                    Frontend.error(context, R.string.error_net_load);
                }
            });
        } catch (IOException e) {
            Frontend.error(context, R.string.error_load_filters, e);
        }

        return rootView;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
    }
}