Whar is the status of R and RStudio official availability on the Android operating system?
I can't speak for R itself, as that's not something we (Posit) have anything to do with.
There are no plans for an official Android version of RStudio.
If you need to work with RStudio via an Android device, you could use a web-based version (Posit Cloud, for example, or you can self-host RStudio Server on a Linux machine and connect to it).
For R on Android, install Termux (Termux F-Droid, the Play build is old), then give it storage access with termux-setup-storage so your files live under ~/storage/shared/. Next, set up a rootless Linux with proot-distro e.g., pkg install proot-distro && proot-distro install debian && proot-distro login debian, and inside Debian install R with apt install r-base r-base-dev build-essential (you may need to install other packages). Keep code in Internal storage/RProjects and symlink it in Debian so both sides see the same files. Use Acode as a tablet-friendly editor. For plots without a GUI (search: “R save plot png headless”), write to files with png("plot.png", 1200, 800, res=150); plot(...); dev.off().
The above is not a complete guide, but should get you started, search or use any AI tool for more details.