VolleyImageSnippet.java

imageView = (ImageView) findViewById(R.id.iv_image);

// ...

String imageUrl = "http://www.example.com/image.jpg";

VolleyHelper.init(this); // we can call this method in other place - e.g. in class extending Application class
                         // and refer to application context insted of activity context

ImageLoader imageLoader = VolleyHelper.getImageLoader();
imageLoader.get(imageUrl,ImageLoader.getImageListener(mImageView,R.drawable.no_image, R.drawable.error_image));

// ...