Android Open Source - TinyRss Feed Activity

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License

The source code is released under:

Copyright (c) 2012, Tiny Mission LLC All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met...

Java Source Code

package com.tinymission.rss;
//from ww  w .  j  a  va 2s . co m
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.*;

import java.text.SimpleDateFormat;

/** Base class for activities that show an RSS feed.
 *
 */
public abstract class FeedActivity extends ListActivity {

  
  /** Subclasses can override to provide a different main list layout
   * This layout must have a ListView with id android:id/list
   * @return the list layout id
   */  
  public int getListLayoutId() {
    return R.layout.feed;
  }
  
  /** Subclasses can override to provide a different item layout
   * @return the feed item layout id
   */  
  public int getItemLayoutId() {
    return R.layout.feed_list_item;
  }
  
  /**
   * @return the maximum number of items to render, or less than 0 for all items (default)
   */
  public int getMaxItems() {
    return -1;
  }
  
  /** Subclasses can override this to show an image next to the feed text.
   * 
   * @return true if an image should be shown next to the feed text (default false)
   */
  public boolean isImageVisible() {
    return false;
  }
  
  /** Subclasses can override to make the item date visible under the title
   * 
   * @return true to show the item date under the title (default false)
   */
  public boolean isDateVisible() {
    return false;
  }

    /** Subclasses can override to show the title, author, or both
     *
     * @return 0 to show title only, 1 to show author only, 2 to show both (default is 0)
     */
    public int showTitleAuthorOrBoth() {
        return 0;
    }

    /** Subclasses can override to specify where to obtain the feed item images.
   * @return a value specifying the source of the feed item images (default Media)
   */
  public FeedImageSource getImageSource() {
    return FeedImageSource.MediaContent;
  }

  private SimpleDateFormat _dateformat;
  
  /**
   * @param format the date format string to use when displaying dates (default "MM/dd/yy 'at' hh:mm a ")
   */
  public void setDateFormat(String format) {
    _dateformat = new SimpleDateFormat(format);
  }
  
  
  private ProgressDialog _progressDialog;

  /** Shows a progress dialog.
   * @param title
   * @param text
   */
  public void showProgressDialog(String title, String text) {
    _progressDialog = ProgressDialog.show(this, title, text);
  }
  
  /** Closes the currently open progress dialog, if there is one.
   */
  public void cancelProgressDialog() {
    if (_progressDialog != null) {
      _progressDialog.cancel();
    }
  }
  
  public void customizeItemView(Item item, View v) {

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getListLayoutId());
        
        setDateFormat("MM/dd/yy 'at' hh:mm a ");
        
        ListView lv = getListView();
        lv.setTextFilterEnabled(true);

    showProgressDialog("Loading...", "Downloading latest feed data");
    FeedFetcher fetcher = new FeedFetcher();
    fetcher.execute(getFeedUrl());
    }


  @Override
  protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    Item item = (Item)getListAdapter().getItem(position);
    onFeedItemClick(item);
  }
  
  protected void onFeedItemClick(Item item) {
    Uri url = Uri.parse(item.getLink());
    if (url != null) {
      Intent intent = new Intent(Intent.ACTION_VIEW, url);
      startActivity(intent);
    }
  }

  /** Subclasses must override this to provide their feed url.
   */
  public abstract String getFeedUrl();

  @Override
  protected void onStart() {
    super.onStart();
  }
    
  /** Class for fetching the feed content in the background.
   * 
   */
  public class FeedFetcher extends AsyncTask<String, Integer, Integer> {

    Feed _feed;
    
    @Override
    protected Integer doInBackground(String... params) {
      Reader reader = new Reader(params[0]);
      _feed = reader.fetchFeed();
      return null;
    }

    @Override
    protected void onPostExecute(Integer result) {
      super.onPostExecute(result);
      cancelProgressDialog();
      if (_feed != null)
        setListAdapter(new FeedAdapter(_feed));
      else {
        Log.w("FeedFetcher", "Unable to fetch feed. See previous errors.");
        Toast.makeText(FeedActivity.this, "There was an error getting the feed. Please try again later.", Toast.LENGTH_LONG).show();
      }
    }
    
  }
  

  /** A list adapter that maps a feed to a list view.
   *
   */
  public class FeedAdapter extends BaseAdapter {
  
    private Feed _feed;

        public FeedAdapter() {

        }
    
    public FeedAdapter(Feed feed) {
      _feed = feed;
    }
    
    @Override
    public int getCount() {
      if (_feed == null)
        return 0;
      if (getMaxItems() > -1 && getMaxItems() < _feed.getItemCount())
        return getMaxItems();
      return _feed.getItemCount();
    }
  
    @Override
    public Object getItem(int position) {
      if (_feed == null)
        return null;
      if (position >= _feed.getItemCount())
        return null;
      return _feed.getItem(position);
    }
  
    @Override
    public long getItemId(int position) {
      return 0;
    }
  
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
  
      View view = null;
      
      if (convertView == null) {
        LayoutInflater inflater = getLayoutInflater();
        view = inflater.inflate(getItemLayoutId(), parent, false);
      }
      else {
        view = convertView;
      }
      
      Item item = (Item)getItem(position);
      if (item == null)
        return view;
      
      TextView titleView = (TextView)view.findViewById(R.id.feed_item_title);
      if (titleView != null && showTitleAuthorOrBoth() != 1)
        titleView.setText(item.getCleanTitle());
            else
                titleView.setVisibility(View.GONE);

            TextView authorView = (TextView)view.findViewById(R.id.feed_item_author);
            if (authorView != null && showTitleAuthorOrBoth() != 0)  {
                String txt =  item.getCleanAuthor();
                if(txt != null) authorView.setText(txt);
                else authorView.setVisibility(View.GONE);
            }
            else
                authorView.setVisibility(View.GONE);

            TextView descView = (TextView)view.findViewById(R.id.feed_item_description);
      if (descView != null)
        descView.setText(item.getCleanDescription());
      
      TextView pubDateView = (TextView)view.findViewById(R.id.feed_item_pubDate);
      if (pubDateView != null) {
        if (isDateVisible() && item.getPubDate() != null) {
          pubDateView.setVisibility(View.VISIBLE);
          pubDateView.setText(_dateformat.format(item.getPubDate()));
        }
        else
          pubDateView.setVisibility(View.GONE);
      }
      
      ImageView imageView = (ImageView)view.findViewById(R.id.feed_item_image);
      if (imageView != null) {
        FeedImageSource imageSource = getImageSource();
        if (isImageVisible() && imageSource != FeedImageSource.None) {
          imageView.setVisibility(View.VISIBLE);
          switch (imageSource) {
          case MediaContent:
            MediaContent mc = item.getMediaContent();
            imageView.setImageBitmap(null);
            if (mc != null) {
              _feed.getImageManager().download(mc.getUrl(), imageView);
            }
            break;
          case MediaThumbnail:
            MediaThumbnail mt = item.getMediaThumbnail();
            imageView.setImageBitmap(null);
            if (mt != null) {
              _feed.getImageManager().download(mt.getUrl(), imageView);
            }
            break;
          default:
            Log.w(getClass().getName(), "Don't know how to get an image from source type: " + imageSource.toString());
          }
        }
        else {
          imageView.setVisibility(View.GONE);
        }
      }
      customizeItemView(item, view);
      return view;
    }
  
  }
  
}

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