When using the NullDC APK, ensure that you comply with all relevant laws and regulations, particularly concerning the use of ROMs. Additionally, be aware that emulation can be demanding on device resources, so a mid-range or high-end Android device is recommended for the best experience.
emulator, as it is the modern descendant of the nullDC/reicast lineage and is actively maintained. Current Recommended Emulators nulldc apk android link