Android Open Source - watchme Image Download Task

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Back to project page watchme.

License

The source code is released under:

Copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documen...

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Java Source Code

/**
*  ImageDownloadTask.java// w w w . j a va 2  s.co m
*
*  Async task for downloading the movie's poster. Using a ResponseCache
*  to cache the images downloaded.
*
*  @see ImageCache
*
*  @author Johan Brook
*  @copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson
*  @license MIT
*/

package se.chalmers.watchme.net;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

public class ImageDownloadTask extends AsyncTask<String, Void, Bitmap> {

  private TaskActions task;
  
  /**
   * Defines an interface to invoke when this ImageTask
   * is finished.
   *  
   * @author Johan
   */
  public interface TaskActions {
    /**
     * The callback which is invoked when the image is
     * done downloading. The image is available as a parameter.
     * 
     * @param image The image as a Bitmap
     */
    public void onFinished(Bitmap image);
  }
  
  /**
   * Create a new download task.
   * 
   * @param task The action to invoke when task is finished
   */
  public ImageDownloadTask(TaskActions task) {
    this.task = task;
  }
  
  @Override
  protected Bitmap doInBackground(String... params) {
    String url = params[0];
    
    try {
      URL imageURL = new URL(url);
      URLConnection connection = imageURL.openConnection();
      // Use local caches
      connection.setUseCaches(true);
      
      return BitmapFactory.decodeStream(connection.getInputStream());
      
    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
      
    return null;
  }
  
  @Override
  protected void onPostExecute(Bitmap bm) {
    this.task.onFinished(bm);
  }
  
}

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