Android Open Source - dn-rss News Item List Activity

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License

The source code is released under:

MIT License

Java Source Code

package kaka.android.dn;
//from  w w w  . j  a v a  2  s.  c o m
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;


/**
 * An activity representing a list of NewsItems. This activity
 * has different presentations for handset and tablet-size devices. On
 * handsets, the activity presents a list of items, which when touched,
 * lead to a {@link NewsItemDetailActivity} representing
 * item details. On tablets, the activity presents the list of items and
 * item details side-by-side using two vertical panes.
 * <p>
 * The activity makes heavy use of fragments. The list of items is a
 * {@link NewsItemListFragment} and the item details
 * (if present) is a {@link NewsItemDetailFragment}.
 * <p>
 * This activity also implements the required
 * {@link NewsItemListFragment.Callbacks} interface
 * to listen for item selections.
 */
public class NewsItemListActivity extends Activity
        implements NewsItemListFragment.Callbacks,
  NewsItemSlideshowFragment.OnFragmentInteractionListener,
  NewsManager.EventListener {

    /**
     * Whether or not the activity is in two-pane mode, i.e. running on a tablet
     * device.
     */
    private boolean mTwoPane;
    private MenuItem refreshItem;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_newsitem_list);

        if (findViewById(R.id.newsitem_detail_container) != null) {
            // The detail container view will be present only in the
            // large-screen layouts (res/values-large and
            // res/values-sw600dp). If this view is present, then the
            // activity should be in two-pane mode.
            mTwoPane = true;

            // In two-pane mode, list items should be given the
            // 'activated' state when touched.
            ((NewsItemListFragment) getFragmentManager()
                    .findFragmentById(R.id.newsitem_list))
                    .setActivateOnItemClick(true);
        }

        App.news.addEventListener(this);
  if (App.hasConnectivity()) {
      App.news.refresh();
  } else {
      App.toast(R.string.no_connectivity);
  }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
  refreshItem = menu.add(getString(R.string.refresh));
  refreshItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
  refreshItem.setIcon(R.drawable.ic_action_navigation_refresh);
  refreshItem.setVisible(!App.news.isRefreshing());
  return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
  if (item == refreshItem) {
      App.news.refresh();
      return true;
  }
  return false;
    }

    @Override
    public void onEvent(NewsManager.Event e) {
  switch (e) {
      case REFRESH_FAILED:
    App.toast(R.string.failed_to_refresh);
      case REFRESHED_NEWS:
    if (refreshItem != null)
        refreshItem.setVisible(true);
    setProgressBarIndeterminateVisibility(false);
    break;

      case REFRESHING:
    if (refreshItem != null)
        refreshItem.setVisible(false);
    setProgressBarIndeterminateVisibility(true);
    break;
  }
    }

    /**
     * Callback method from {@link NewsItemListFragment.Callbacks}
     * indicating that the item with the given ID was selected.
     */
    @Override
    public void onItemSelected(String id) {
  showNewsItem(id);
    }

    @Override
    public void onSlideClick(String id) {
  showNewsItem(id);
    }

    private void showNewsItem(String id) {
  if (mTwoPane) {
      // In two-pane mode, show the detail view in this activity by
      // adding or replacing the detail fragment using a
      // fragment transaction.
      Bundle arguments = new Bundle();
      arguments.putString(NewsItemDetailFragment.ARG_ITEM_ID, id);
      NewsItemDetailFragment fragment = new NewsItemDetailFragment();
      fragment.setArguments(arguments);
      getFragmentManager().beginTransaction()
        .replace(R.id.newsitem_detail_container, fragment)
        .commit();

  } else {
      // In single-pane mode, simply start the detail activity
      // for the selected item ID.
      Intent detailIntent = new Intent(this, NewsItemDetailActivity.class);
      detailIntent.putExtra(NewsItemDetailFragment.ARG_ITEM_ID, id);
      startActivity(detailIntent);
      overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
  }
    }
}

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