Hi,
I will develop best quality Native app "offline pro wallpaper app" in Android Studio, Exactly as you want like Wallpapers HD, 4K Backgrounds, I checked this app.
Will add Splash, Options, Privacy Policy, Admob Ads easily.
I have expertise in Android. And in developing similar apps.
As we will have offline 45 image, it will increase size of app.
Looking forward to work with you,
Thanks,
Swapnil Chouhan