Android Open Source - spring-android-samples Atom Feed Activity

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2010-2014 the original author or authors.
 */*ww w  .  j a  v a 2  s . c o m*/
 * 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 org.springframework.android.reader;

import java.util.List;

import org.springframework.http.converter.feed.AtomFeedHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;

import com.google.code.rome.android.repackaged.com.sun.syndication.feed.atom.Entry;
import com.google.code.rome.android.repackaged.com.sun.syndication.feed.atom.Feed;
import com.google.code.rome.android.repackaged.com.sun.syndication.feed.atom.Link;

/**
 * @author Roy Clarkson
 * @author Helena Edelson
 * @author Pierre-Yves Ricau
 */
public class AtomFeedActivity extends AbstractAsyncListActivity {

  protected static final String TAG = AtomFeedActivity.class.getSimpleName();

  private Feed feed;

  // ***************************************
  // Activity methods
  // ***************************************
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setTitle(null);

    // initiate the asynchronous network request
    new DownloadAtomFeedTask().execute();
  }

  @Override
  public void onStart() {
    super.onStart();
  }

  // ***************************************
  // ListActivity methods
  // ***************************************
  @Override
  protected void onListItemClick(ListView l, View v, int position, long id) {
    Entry entry = (Entry) feed.getEntries().get(position);
    List<?> alternateLinks = entry.getAlternateLinks();

    if (alternateLinks.size() > 0) {
      Link link = (Link) alternateLinks.get(0);
      Log.i(TAG, link.getHref());
      Intent intent = new Intent("android.intent.action.VIEW", Uri.parse(link.getHref()));
      this.startActivity(intent);
    }
  }

  // ***************************************
  // Private methods
  // ***************************************
  private void refreshAtomFeed(Feed feed) {
    this.feed = feed;

    if (feed == null) {
      return;
    }

    setTitle(feed.getTitle());
    AtomFeedListAdapter adapter = new AtomFeedListAdapter(this, feed);
    setListAdapter(adapter);
  }

  // ***************************************
  // Private classes
  // ***************************************
  private class DownloadAtomFeedTask extends AsyncTask<Void, Void, Feed> {

    @Override
    protected void onPreExecute() {
      // before the network request begins, show a progress indicator
      showLoadingProgressDialog();
    }

    @Override
    protected Feed doInBackground(Void... params) {
      try {
        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();

        // Add the ATOM message converter to the RestTemplate instance, since it is not automatically available
        restTemplate.getMessageConverters().add(new AtomFeedHttpMessageConverter());

        // The URL for making the request
        final String url = getString(R.string.atom_feed_url);

        // Initiate the request and return the results
        return restTemplate.getForObject(url, Feed.class);
      } catch (Exception e) {
        Log.e(TAG, e.getMessage(), e);
      }

      return null;
    }

    @Override
    protected void onPostExecute(Feed feed) {
      // hide the progress indicator when the network request is complete
      dismissProgressDialog();

      // return the feed list
      refreshAtomFeed(feed);
    }

  }

}
Java Source Code List
