The version available for download today is a "port." This is not a simple emulation. Developers have taken the PC version of the game, stripped away the heavy DRM, and optimized the controls and code to run on Android architecture. This usually involves a launcher that loads the game assets via the OBB data file.
If you want that GTA IV vibe on Android today, do this instead:
Downloading the game is the first hurdle. Because this is not on the Google Play Store, you must source the files from third-party sites. You will need two specific files:
(GTA 4) remains a landmark title in gaming history. Released in 2008 for PC, Xbox 360, and PS3, it introduced us to Niko Bellic, the gritty streets of Liberty City, and a level of narrative depth rarely seen in open-world games.