FeedFragment.java

/*
 * Copyright 2012 Feedlr
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.chalmers.feedlr.ui;

import com.chalmers.feedlr.R;
import com.chalmers.feedlr.activity.FeedActivity;
import com.chalmers.feedlr.adapter.FeedAdapter;
import com.chalmers.feedlr.database.DatabaseHelper;
import com.chalmers.feedlr.database.FeedCursorLoader;
import com.chalmers.feedlr.external.PullToRefreshListView;
import com.chalmers.feedlr.external.PullToRefreshListView.OnRefreshListener;
import com.chalmers.feedlr.listener.FeedListener;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.Loader;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v4.widget.CursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

/**
 * 
 * @author Olle Werme
 * 
 */

public class FeedFragment extends ListFragment implements
		LoaderCallbacks<Cursor> {

	public static FeedFragment newInstance(Bundle args) {
		FeedFragment pageFragment = new FeedFragment();
		pageFragment.setArguments(args);
		return pageFragment;
	}

	private FeedAdapter adapter;
	private String feedTitle;
	private PullToRefreshListView listView;
	private Loader<Cursor> loader;
	private FeedListener listener;
	private LocalBroadcastManager lbm;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		Bundle arg = getArguments();
		feedTitle = arg.getString("title");

		lbm = LocalBroadcastManager.getInstance(getActivity());

		IntentFilter filter = new IntentFilter();
		filter.addAction(FeedActivity.FEED_UPDATED);
		filter.addAction(FeedActivity.FEED_PROBLEM_UPDATING);
		filter.addAction(FeedActivity.NO_CONNECTION);
		lbm.registerReceiver(receiver, filter);
	}

	@Override
	public void onDestroy() {
		lbm.unregisterReceiver(receiver);
		super.onDestroy();
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		String[] columns = new String[] { DatabaseHelper.ITEM_COLUMN_TEXT,
				DatabaseHelper.ITEM_COLUMN_USERNAME };
		int[] to = new int[] { R.id.feed_item_text, R.id.feed_item_author };

		adapter = new FeedAdapter(getActivity(), R.layout.feed_item, null,
				columns, to, CursorAdapter.NO_SELECTION);

		setListAdapter(adapter);

		loader = getLoaderManager().initLoader(0, null, this);

		listView = (PullToRefreshListView) getListView();

		listView.setOnRefreshListener(new OnRefreshListener() {
			@Override
			public void onRefresh() {
				listener.onFeedUpdateRequest(feedTitle);
			}
		});

	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {

		View view = inflater.inflate(R.layout.feed_layout, container, false);
		return view;
	}

	@Override
	public Loader<Cursor> onCreateLoader(int id, Bundle args) {
		return new FeedCursorLoader(getActivity(), feedTitle);
	}

	@Override
	public void onLoadFinished(Loader<Cursor> arg0, Cursor data) {
		adapter.swapCursor(data);
	}

	@Override
	public void onLoaderReset(Loader<Cursor> arg0) {
		adapter.swapCursor(null);
	}

	public void update() {
		getLoaderManager().restartLoader(0, null, this);
	}

	public void setUpdateRequestListener(FeedListener listener) {
		this.listener = listener;
	}

	private BroadcastReceiver receiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			String broadcast = intent.getAction();

			if (broadcast.equals(FeedActivity.FEED_UPDATED)) {
				loader.forceLoad();
			} else if (broadcast.equals(FeedActivity.NO_CONNECTION)) {
				Toast.makeText(getActivity(), "No Internet connection found!",
						Toast.LENGTH_LONG).show();
			}

			listView.onRefreshComplete();
		}
	};
}