I want that when you click a button, it shows you a menu to choose beetween diferent backgrounds, and when you click someone, it changes. Thank you!
What have you tried? Maybe show some blocks.
I deleted it because it dont works 
What kind of menu. A listview, a listpicker, a menu with thumbnails of the images?
Changes the background in the app?
Yes, the background in the app, i dont have preferences, but i prefer with thumbnails of the images.
One way could be a horizontal scrolling arrangement with thumbnail images inside that you can click.
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Can you show me the blocks?
see here:
and here
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