//imageを取得
ImageView image = (ImageView) view.findViewById(R.id.cell_image);
//画像取得スレッド起動
ImageGetTask task = new ImageGetTask(image);
task.execute("https://www.gstatic.com/android/market_images/web/play_logo_x2.png");

// Image取得用スレッドクラス
    class ImageGetTask extends AsyncTask<String,Void,Bitmap> {
        private ImageView image;

        public ImageGetTask(ImageView _image) {
            image = _image;
        }
        @Override
        protected Bitmap doInBackground(String... params) {
            Bitmap image;
            try {
                URL imageUrl = new URL(params[0]);
                InputStream imageIs;
                imageIs = imageUrl.openStream();
                image = BitmapFactory.decodeStream(imageIs);
                return image;
            } catch (MalformedURLException e) {
                return null;
            } catch (IOException e) {
                return null;
            }
        }
        @Override
        protected void onPostExecute(Bitmap result) {
            // 取得した画像をImageViewに設定します。
            image.setImageBitmap(result);
        }
    }