Dave wants to find an Android alternative for the "Find My iPhone" app. Leo says that LookOut is a good option. It scans all downloads to make sure they aren't problematic, but it'll also tell him where his phone is. He can even remote wipe the phone if he needs to.
Lookout also has a feature called "Signal Flare," which saves the last known location to LookOut's cloud servers should the battery die or signal stop.
If he has a Galaxy SIII or above, his OS has this capability natively.