Android asynchronously loading image instance code

/**
 * User: Tom
 * Date: 13-5-13
* Time: 8:07 pm
 */
public class AsnycImageLoader {

//Define a HashMap to store cached Image key as String Value as a resource file with a weak reference
// Pictures To facilitate the recycling of JAVA
    private Map<String, SoftReference<Drawable>> imageCache = null;
    public AsnycImageLoader() {
        imageCache = new HashMap<String, SoftReference<Drawable>>();
    }

    /**
* Loading pictures
* <p>imageurl is the URL to download the resource.
* ImageCallback When there is no related image in the cache, it will be downloaded online in a timely manner.
* Use Handler to operate the UI under multi-threading. Use the callback interface to update the UI
     * </p>
     * @param imageUrl
     * @param callback
     * @return
     */
    public Drawable loadDrawable(final String imageUrl, final ImageCallback callback) {
//Document whether there is a cached image in ImageCache
        if ((imageUrl)) {
            SoftReference<Drawable> softReference = (imageUrl);
            if (() != null) {
                return ();
            }
        }
//Define the Handler for the operation UI
        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                ((Drawable) );
            }
        };

        new Thread(new Runnable() {
            @Override
            public void run() {
                Drawable drawable = loadImageFromUrl(imageUrl);
                (imageUrl, new SoftReference<Drawable>(drawable));
                Message message = (0, drawable);
                (message);
            }
        }).start();
        return null;
    }

//Get resources based on the URL address
    protected Drawable loadImageFromUrl(String imageUrl) {
        try {
            return (new URL(imageUrl).openStream(), "src");
        } catch (Exception e) {
            throw new RuntimeException();
        }
    }

//Callback interface
    public interface ImageCallback {
        public abstract void imageLoaded(Drawable drawable);
    }
}

/**
 * User: Tom
 * Date: 13-5-13
* Time: 8:33 pm
 */
public class LoadImage extends Activity {
    private AsnycImageLoader loader = null;

    public void onCreate(Bundle savedInstanceState) {
        (savedInstanceState);
        setContentView();

        loader = new AsnycImageLoader();

        loadImage("https:///images/", .image1);
        loadImage("https:///images/", .image2);
        loadImage("http://pic28./20130421/12302174_231210305323_2.jpg", .image3);

    }

    public void loadImage(String url, int id) {
        final ImageView imageView = (ImageView) findViewById(id);
        Drawable cacheImage = (url, new () {
            @Override
            public void imageLoaded(Drawable drawable) {
                (drawable);
            }
        });
        if (cacheImage != null) {
            (cacheImage);
        }
    }
}