Original Alpha versions were written in Java for computers. There was no "APK" (Android Package) for Alpha 1.2.7 in 2010, as Pocket Edition didn't launch until much later.
If you are looking for an "updated" APK for this version, proceed with caution: Unofficial Origin: minecraft alpha 127 download apk updated
The Alpha 1.2 upgrade cycle was known as the , released on October 31, 2010. This update introduced the Nether, biomes, and netherrack. Original Alpha versions were written in Java for computers
A fan-made "cursed" or horror version of the game designed to mimic an "undiscovered" update. released on October 31
Finding a working Alpha 1.2.7 APK for Android can be tricky. Here is the updated reality of downloading old versions: