How can I detect when an Android application is running in the emulator?

Question

I would like to have my code run slightly differently when running on the emulator than when running on a device. (For example, using 10.0.2.2 instead of a

Answer 1

Put a file in the file system of the emulator; since the file won't exist on the real device, this should be stable, reliable and easy to fix when it breaks.