I'm starting with AndoridStudio just now. I want to leave App Inventor because of its limits on dynamic contents and because I prefer manipulate directly the code instead of Blocks which have many limitations.
So, I was trying to set a background image for my main Activity, but the message is:
Couldn't resolve resource @drawable/tortugas
Failed to convert @drawable/tortugas into a drawable
I also tried to set backgroundTint, but I get a warning saying backgroundTint is only used in API level 21 or higher and any color I try to set
raises a warning saying the resource is marked as private and anyway the color doesn't appear. Even setting the colo using the color picker doesn't change the look of the emulator. What am I missing?
I read the manual 'Android Studio Essentials' but I didn't find anything about this and what I found surfing the web is unuseful: I yet follow those guidances but with no result...
Thank you in advance