I'd like to know how to load the image URL in DB into Android image view.

On Android, there is a library called Picasso.

ImageView imageView = (ImageView) findViewById(R.id.imageView);
Picasso.with(context).load("http://i.imgur.com/DvpvklR.png").into(imageView);

You can use it simply like above.

You should learn how to save the URL to the DB using SQLite to save the data.

Note: http://cocomo.tistory.com/409