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i want an android app. that has 30 wallpaper inside. user can view all 30 wallpapers one by one (using next and previous button). user can also save the wallpaper in their devices(using save button). user can also set the current wallpaper as a background(using set as background button). user can also exit from app(using exit app button.) application starts with first wallpaper(one of the all 30) in full screen. the screen has option like next button and previous button. when user press the setting button from their phone "it has to buttons like save and exit".