Need Tip on Ripping One Piece Treasure Cruise.

Hi,

I want to learn how to rip sprites from Android Games and I choose One Piece Treasure Cruise for my first project.

VR Resource doesn't have the sprites yet. Thought that if I able to rip something, I can contribute them to VR Resource too.

I've been reading around the forum for tips, but I could not find any proper guidelines.

I tried change the extension from APK to ZIP. I only saw these PNGs inside the "assets" folder.

Can anyone teach or point me the tutorials (if any)? Thanks.