If you want to keep a compressed backup of your legally owned game:
After installation, open the game. It will verify files (a few seconds) and then start. If you want to keep a compressed backup
For better performance on Android:
When you find a file matching "gta+san+andreas+zip+file+download+highly+compressed+for+android+better", check for these specs. If the file doesn't meet this criteria, keep scrolling. After installation, open the game
If you want the real game running smoothly and looking great on your phone, follow these steps. If you want to keep a compressed backup
Rockstar Games released an official Android port. It is regularly updated and optimized for modern devices.