Please read my project requirement before reaching to me and request you not to waste time untill you are good to complete it.
Wallpaper are shown in android app via api and it has some categories. We need to build the code to change the wallpapers automatically based upon the category or latest wallpaper or popular wallpaper user choose for every hour or minute or day or week.
Please reach to me if you can do it. I have got the wallpaper android source code with me, just need the above feature.
Attached the sample screenshot for your reference from others app.