Android : Set a url in drawable image

hello i have this line of code

ArrayList<list_view_comments> arraydir = new ArrayList<list_view_comments>();

list_view_comments = new list_view_comments(getResources().getDrawable(R.drawable.ic_launcher), "Arianna Huffington", "Presidenta");

arraydir.add(list_view_comments);

in second line have on drawable image and he find a ic_launcher android

I need to take the photo by url

as would be possible?