EventsActivity.java

/*
 * Copyright 2011 the original author or authors.
 *
 * 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.springsource.greenhouse.events;

import java.util.List;

import org.springframework.social.greenhouse.api.Event;

import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;

import com.springsource.greenhouse.AbstractGreenhouseListActivity;
import com.springsource.greenhouse.R;

/**
 * @author Roy Clarkson
 */
public class EventsActivity extends AbstractGreenhouseListActivity {
	
	protected static final String TAG = EventsActivity.class.getSimpleName();
	
	private List<Event> upcomingEvents;
	
	
	//***************************************
    // Activity methods
    //***************************************
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	}
	
	@Override
	public void onStart() {
		super.onStart();
		
		if (upcomingEvents == null) {
			downloadEvents();
		}
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	    MenuInflater inflater = getMenuInflater();
	    inflater.inflate(R.menu.events_menu, menu);
	    return true;
	}
	
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	    // Handle item selection
	    switch (item.getItemId()) {
	    	case R.id.events_menu_refresh:
	    		downloadEvents();
	    		return true;
	    	default:
	    		return super.onOptionsItemSelected(item);
	    }
	}

	
	//***************************************
    // ListActivity methods
    //***************************************
	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		super.onListItemClick(l, v, position, id);
		
		Event event = upcomingEvents.get(position);
		getApplicationContext().setSelectedEvent(event);		
		startActivity(new Intent(this, EventDetailsActivity.class));
	}
	
	
	//***************************************
    // Private methods
    //***************************************
	private void refreshEvents(List<Event> upcomingEvents) {	
		this.upcomingEvents = upcomingEvents;

		if (upcomingEvents == null) {
			return;
		}
		
		setListAdapter(new EventsListAdapter(this, upcomingEvents));
	}
		
	private void downloadEvents() {
		new DownloadEventsTask().execute();
	}
	
	
	//***************************************
    // Private classes
    //***************************************
	private class DownloadEventsTask extends AsyncTask<Void, Void, List<Event>> {
		
		private Exception exception;
		
		@Override
		protected void onPreExecute() {
			showProgressDialog(); 
		}
		
		@Override
		protected List<Event> doInBackground(Void... params) {
			try {
				return getApplicationContext().getGreenhouseApi().eventOperations().getUpcomingEvents();
			} catch(Exception e) {
				Log.e(TAG, e.getLocalizedMessage(), e);
				exception = e;
			}
			
			return null;
		}
		
		@Override
		protected void onPostExecute(List<Event> result) {
			dismissProgressDialog();
			processException(exception);
			refreshEvents(result);
		}
	}
}