Android Open Source - lastUpdates Async Image Loader

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Back to project page lastUpdates.

License

The source code is released under:

GNU General Public License

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Java Source Code

package com.focusings.focusingsworld.ImageAndTextList;
/*w  w w  .  j  av a  2 s  . c  o m*/
import java.io.IOException;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.net.URL;
import java.util.HashMap;

import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;

public class AsyncImageLoader {
    private HashMap<String, SoftReference<Drawable>> imageCache;
    
    public AsyncImageLoader() {
      imageCache= new HashMap<String, SoftReference<Drawable>>();
    }
 
    public Drawable loadDrawable(final String imageUrl, final ImageCallback imageCallback) {
      final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageCallback.imageLoaded((Drawable) message.obj, imageUrl);
            }
        };
      
      if (imageCache.containsKey(imageUrl)) {
            SoftReference<Drawable> softReference = imageCache.get(imageUrl);
            Drawable drawable = softReference.get();
            if (drawable != null) {
                return drawable;
            }
        }else{
          new Thread() {
              @Override
              public void run() {
                  Drawable drawable = loadImageFromUrl(imageUrl);
                  imageCache.put(imageUrl, new SoftReference<Drawable>(drawable));
                  Message message = handler.obtainMessage(0, drawable);
                  handler.sendMessage(message);
              }
          }.start();
        }
        return null;
    }
 
    public static Drawable loadImageFromUrl(String url) {
      InputStream inputStream;
        try {
            inputStream = new URL(url).openStream();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return Drawable.createFromStream(inputStream, "src");
    }
 
    public interface ImageCallback {
        public void imageLoaded(Drawable imageDrawable, String imageUrl);
    }
}

Java Source Code List