Android Open Source - Alkomer Image Download Async Task

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Back to project page Alkomer.

License

The source code is released under:

MIT License

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Java Source Code

package cz.jmx.tomik.alkomer.android.threads;
//from  w  ww . j  a v a  2 s.c om
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.ImageView;
import android.widget.Toast;

/**
 * Alkomer - Server App
 * --------------------
 * Downloads Image and Displays it (ASyncTask)
 *
 * @copyright   Copyright (c) 2011 Tomas Vitek
 * @author      Tomas Vitek ~ http://tomik.jmx.cz

 * @package     Alkomer
 * @version     1.0
 */
public class ImageDownloadAsyncTask extends AsyncTask<String, Void, Bitmap> {

  protected Activity screen;
  protected ImageView placer;
  
  public ImageDownloadAsyncTask(Activity screen, ImageView placer) {
    this.placer = placer;
    this.screen = screen;
  }
  
  protected void onPostExecute(Bitmap image) {
    placer.clearAnimation();     
    placer.setImageBitmap(image);
    
    if (image == null) {
      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(screen);
        if (!prefs.getBoolean("chartErrorShown", false)) {      
          Toast.makeText(screen, "P?i na??t?n? graf? nastala chyba! Zkontrolujte, zda m?te funk?n? p?ipojen? k internetu. \n\nPokud chyba p?etrv?v?, zkuste to pros?m pozd?ji.", Toast.LENGTH_SHORT).show();
          
          Editor editor = prefs.edit();
          editor.putBoolean("chartErrorShown", true);
          editor.commit();            
        }      
    }
    }

  @Override
  protected Bitmap doInBackground(String... arg0) {
    
    String url = arg0[0];
    
    Log.d("Downloading IMAGE", url);
    
    URL myFileUrl = null; 
    try {
      myFileUrl = new URL(url);
    } catch (MalformedURLException e) {
      Log.e("ImageDownload Error", e.getMessage());
    }
    try {
      HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
      conn.setDoInput(true);
      conn.connect();
      InputStream is = conn.getInputStream();
  
      return BitmapFactory.decodeStream(is);
    } catch (IOException e) {
      Log.e("ImageDownload Error", e.getMessage());
    }
    
    return null;    
    
  }
}

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