android gallery with images from url folder

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http://stackoverflow.com – I'm begginer in Android programming and I need help. How could I create an app that shows images in grid view but whenever the app is started it refreshes and loads new images from online folder? I cant find anywhere help on internet. Everybody are giving help in loading images from specific url, for example .../image.jpg, but I would like images to load from .../images/..., and show just at specific size nad when user click it loads specific url or something like that? (HowTos)