private InputStream download(String urlString) throws MalformedURLException, IOException {
    InputStream inputStream = (InputStream) new URL(urlString).getContent();
    return inputStream;
}

private final Map<String, Drawable> cache = new HashMap<String, Drawable>();

public void loadImage(final ImageView imageView, final String urlString, boolean useCache) {
    if (useCache && cache.containsKey(urlString)) {
        imageView.setImageDrawable(cache.get(urlString));
    }

    //Show a "Loading" image here
    imageView.setImageResource(R.drawable.image_indicator);

    Log.d(this.getClass().getSimpleName(), "Image url:" + urlString);

    final Handler handler = new Handler() {
        @Override
        public void handleMessage(Message message) {
            imageView.setImageDrawable((Drawable) message.obj);
        }
    };

    Runnable runnable = new Runnable() {
        public void run() {
            Drawable drawable = null;
            try {
                InputStream is = download(urlString);
                drawable = Drawable.createFromStream(is, "src");

                if (drawable != null) {
                    cache.put(urlString, drawable);
                }
            } catch (Exception e) {
                Log.e(this.getClass().getSimpleName(), "Image download failed", e);
                //Show a "download fail" image 
                drawable = imageView.getResources().getDrawable(R.drawable.image_fail);
            }
            
            //Notify UI thread to show this image using Handler
            Message msg = handler.obtainMessage(1, drawable);
            handler.sendMessage(msg);
        }
    };
    new Thread(runnable).start();
}

List<MyRecord> exampleRecords;
LazyImageHelper lazyImageHelper = new LazyImageHelper();

class MyAdapter extends ArrayAdapter<MyRecord> {

    public MyAdapter(Context context) {
        super(context, R.layout.record_row, R.id.lblLabel, exampleRecords);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        MyRecord record = getItem(position);

        TextView lblLabel = (TextView) view.findViewById(R.id.lblLabel);
        ImageView imageView = (ImageView) view.findViewById(R.id.img);

        lblLabel.setText(record.getLabel());

        //For demo purpose, cache is DISABLED here.
        lazyImageHelper.loadImage(imageView, record.getImageUrl(), false);

        //To enable cache, simply use following code:
        //lazyImageHelper.loadImage(imageView, record.getImageUrl(), true);

        return view;
    }
}