Android Open Source - AndroidFlickrPlay Flickr Service A Task

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Back to project page AndroidFlickrPlay.

License

The source code is released under:

Apache License

Java Source Code

package com.ufo.androidphotoviewer.flickr;
/*from ww w . jav  a2 s.  co m*/
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Locale;

import org.json.JSONArray;
import org.json.JSONObject;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;



/**
 * Threaded task used to retrieve a list of all new 
 * Flickr images and parse out JSON reply.
 * 
 * @author Vlad
 *
 */
class FlickrServiceATask extends AsyncTask<Void, FlickrResultSet, FlickrResultSet> 
{
  private static final int CONNECTION_ESTABLISH_TIMEOUT = 3000;  // 3 seconds
  private static final int CONNECTION_READ_TIMEOUT = 3000;  // 3 seconds  
  
  //RESPONSE PARAMETER FLICKR RESULTSET JSONy
  private static final String JSON_RESULT_TITLE = "title";
  private static final String JSON_RESULT_LINK = "link";
  private static final String JSON_RESULT_DESCRIPTION = "description";
  private static final String JSON_RESULT_MODIFIED = "modified";
  private static final String JSON_RESULT_ITEMS = "items";  
  
  //RESPONSE PARAMETER FLICKR IMAGE JSON
  private static final String JSON_IMG_TITLE = "title";
  private static final String JSON_IMG_LINK = "link";
  private static final String JSON_IMG_MEDIA = "media";  // Sublist
  private static final String JSON_IMG_MEDIA_URL = "m";  // Member of media sublist list
  private static final String JSON_IMG_DESCRIPTION = "description";
  private static final String JSON_IMG_PUBLISHED = "published";
  private static final String JSON_IMG_AUTHOR = "author";
  private static final String JSON_IMG_AUTHOR_ID = "author_id";
  private static final String JSON_IMG_TAGS = "tags";

  private FlickrQueryCriteria criteria;
  private Context context;  
  
  
  
  //CONSTRUCTOR
  public FlickrServiceATask(FlickrQueryCriteria criteria, Context ctx)
  {
    this.criteria = criteria;
    this.context = ctx;
  }
  
  

  @Override
    protected FlickrResultSet doInBackground(final Void... unused)
    {  
    FlickrResultSet result = new FlickrResultSet();
    result.setQueryCrtieria(this.criteria);
    ArrayList<FlickrImage> images = new ArrayList<FlickrImage>();  
    
       InputStream in = null;  
       HttpURLConnection connection;
      
    try{
      // Setup connection
         URL serviceURL = new URL(this.criteria.getRequestUrl());
         connection = (HttpURLConnection) serviceURL.openConnection();
           connection.setConnectTimeout(CONNECTION_ESTABLISH_TIMEOUT);
           connection.setReadTimeout(CONNECTION_READ_TIMEOUT);
           connection.setRequestProperty("Content-Type",  "application/json");  
           connection.setRequestMethod("GET");
           connection.setUseCaches(false);
           connection.setDoInput(true);  //Sets for GET request
           connection.setChunkedStreamingMode(0);

           // Get JSON reply from service
          in = new BufferedInputStream(connection.getInputStream());
          StringBuilder sb = new StringBuilder();
          while (in.available() > 0) 
          {
            sb.append((char)in.read());
          }
          
          // Get result meta-data
          JSONObject responseObj = new JSONObject(sb.toString());
          result.setTitle(responseObj.getString(JSON_RESULT_TITLE));
          result.setLink(responseObj.getString(JSON_RESULT_LINK));
          result.setDescription(responseObj.getString(JSON_RESULT_DESCRIPTION));
          result.setModified(parseJsonDate(responseObj.getString(JSON_RESULT_MODIFIED)));
          
          // Get list of images
          JSONArray jsonImageList = new JSONArray(responseObj.getString(JSON_RESULT_ITEMS));          
          for (int i = 0; i< jsonImageList.length(); i++)
          {
            JSONObject tmpJsonImg = jsonImageList.getJSONObject(i);
            FlickrImage tmpImg = new FlickrImage();
            
            tmpImg.setTitle(tmpJsonImg.getString(JSON_IMG_TITLE));
            tmpImg.setAlbumLink(tmpJsonImg.getString(JSON_IMG_LINK));
            tmpImg.setDescriptionHTML(tmpJsonImg.getString(JSON_IMG_DESCRIPTION));
            tmpImg.setPublishDate(parseJsonDate(tmpJsonImg.getString(JSON_IMG_PUBLISHED)));
            tmpImg.setAuthor(tmpJsonImg.getString(JSON_IMG_AUTHOR));
            tmpImg.setAuthorID(tmpJsonImg.getString(JSON_IMG_AUTHOR_ID));
             tmpImg.setTags(tmpJsonImg.getString(JSON_IMG_TAGS));
            JSONObject tmpJsonImgUrl = tmpJsonImg.getJSONObject(JSON_IMG_MEDIA);
            tmpImg.setImageURL(tmpJsonImgUrl.getString(JSON_IMG_MEDIA_URL));
            
            images.add(tmpImg);
          }
          
          result.setImages(images);          
          
          in.close();
          connection.disconnect();
          
        } catch (java.net.SocketException ex) {
          System.out.println("FlickrServiceATask: Socket Exception: " + ex.getMessage());
          ex.printStackTrace();
        } catch (Exception ex) {
          System.out.println("FlickrServiceATask: Exception");
          ex.printStackTrace();
        }

       return result;         
    }
    
    @Override
    protected void onPostExecute(FlickrResultSet result) 
    {
      //Broadcast message to subscribed activities (FlickrQueryEngine)
      if ((result != null) && (result.getImages() != null) && (result.getImages().size() > 0)) {
        Intent broadcastIntent = new Intent(FlickrQueryEngine.GOT_RESPONSE);
        broadcastIntent.putExtra(FlickrQueryEngine.INTENT_RESULT_NAME, result);
        context.sendBroadcast(broadcastIntent);
      } else {
        Intent broadcastIntent = new Intent(FlickrQueryEngine.RESPONSE_FAIL);
        context.sendBroadcast(broadcastIntent);
      }
    }
    
    
    /**
     * Convert ISO8601 date to java.util.date
     * 
     * @param string date
     * @return java.util.date
     */
    private static Date parseJsonDate(String jsonDate)
    {
      Date date = null;
      
      try {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.ENGLISH);
        date = formatter.parse(jsonDate);
      } catch (ParseException e) {
      e.printStackTrace();
    }
      
      return date;      
    }
    
}

Java Source Code List

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